CN105646064A - Engineering method for producing biochar soil from dredging sediment - Google Patents
Engineering method for producing biochar soil from dredging sediment Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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Abstract
The present invention relates to an engineering method for producing biochar soil from dredging sediment, and belongs to the field of solid waste resource utilization. The biochar soil is prepared by uniformly mixing the raw materials of dredging sediments, poultry manure and dry straw according to a certain weight proportion, adjusting the C/N ratio and moisture content of the mixture, adding a certain proportion of a nitrogen retention and water-retaining agent; carrying out windrow composting by a mechanical turning and static forced ventilation combined manner for about 30 days, maintaining the pile at 55-65 DEG C for 10-12 days until the full maturity of the compost products. The biochar soil is utilized according to actual need. The invention realizes large-scale engineering treatment of dredging sediment, poultry manure and crops straws, provides an ecological way to solve the non-point source pollution caused by dredging sediment and poultry manure, and air problem caused by crops straws burning; and the compost products can be used for ecological engineering construction, so as to organically combine environmental benefits, economic benefits and ecological benefits.
Description
Technical field
The present invention relates to the engineering method that a kind of desilting bed mud prepares biological carbon soil, belong to solid waste resource utilization field.
Background technology
Riverbed sludge (also known as mud) mainly stems from the silt entrained by rainwash, Lu Sheng plant and animal residues, and the residual body of aquatic animals and plants, the pollution substance entrained by atmosphere dried wet deposition, under physics, chemistry, biological acting in conjunction, water body precipitation is formed. Bed mud not only can block river course, can become pollution substance " source " under the conditions such as certain pH, dissolved oxygen, redox potential simultaneously, and the material such as nutritive salt, heavy metal can be released into water body, brings huge threat to hydro-ecological safety.
Ecological dredging is the effective measure solving lake, river endogenous pollution, dredging channel, but a large amount of bed mud of bed mud such as improper the conducting oneself well that dredging comes up is put and can be brought huge pressure to ecotope. For basin, upstream, Taihu Lake, average deposit depth 0.9m, intends this basin is carried out desilting, wherein total desilting amount weight hundred ten thousand stere. The bed mud come in desilting, usually it is deposited in storage mud field as solid waste, not only take a large amount of soil, and easily environment produced secondary pollution, the suiting measures to local conditions of desilting bed mud, efficiently, economic recycling become the bottlenecks that ecological dredging engineering is carried out on a large scale. In bed mud resource utilization, achieve a large amount of patented technology both at home and abroad, mainly concentrated on bed mud and manufacture material of construction, material for water treatment, plant substrates and compost three aspects, but all fail to realize the application of large-scale through engineering approaches.
About preparing in material of construction with bed mud, the people such as Zhang Jian (Authorization Notice No.: CN103102133B) disclose that a kind of mud is non-burning brick and its preparation method, taking dredging silt, flyash, unslaked lime, plaster stone, jelling agent, promotor, water glass as raw material, non-burning brick by the manufacture technics of drying with steam; The people (Authorization Notice No.: CN102826818B) such as the yellow people's livelihood disclose the preparation method of a kind of bottom mud brick, take river bottom mud as raw material, described river bottom mud, straw, waste glass powder, binding agent are mixed in proportion, make bottom mud brick by the mode of pressure sintering;Magnify the people of grade (Authorization Notice No.: CN102030491B) of heap of stone and disclose the method adopting Dredged bed mud and the clay standby super light high strength ceramic aggregate of nearly bank STOL, be still that the mode by sintering obtains material of construction; The people such as Zhan Xu (application number: the method 201210111551.6) disclosing the application of a kind of riverway sludge resource utilization, other component of being adulterated by mud is fired into clay brick under certain conditions; The people such as Ma Caifeng (application number: 201510288573.3) disclosing a kind of take riverbed sludge as Shi ceramic tile and its preparation method of main raw material, and by certain technique prepared by riverbed sludge albite and potassium felspar sand Shi ceramic tile; Wish that building medium people (application number: 201510242654.X) discloses a kind of method utilizing the imitative concrete for plant growth of mud preparation, makes aggregate by the mud after dehydration by other consolidating material; The people such as Gao Yufeng (application number: 2015102132.X) disclose and a kind of unburned exempt from pressure brick made of mud and its preparation method, and taking dredging silt, cement, gypsum, slag, flyash, lime, hardening accelerator, as raw material manufacture, to exempt from pressure non-burning brick; The people such as Yu Yang (application number: 201410555785.9) disclose a kind of method utilizing lake silt to prepare novel energy-conserving sinter walling materials, main method sinters after adding chemical reagent; Recklessly people such as security personnel grade (application number: 201410415220.0) disclosing a kind of river and lake dredging bed mud is the non-burning brick of major ingredient and natural curing making method thereof, prepares non-burning brick taking river and lake dredging bed mud, cement, sand, flyash, unslaked lime, water glass, frostproofer as the technique that raw material is certain; (application: the method 201410326354.5) disclosing the non-sintered brickmaking of a kind of Dredged bed mud, adds 2,4 by bed mud after dehydration to the people such as Song Di, 6-trithio base-1,3,5-triazine three sodium salt mixes, and then adds unslaked lime, cement, natural zeolite non-burning brick by Making mold. It is need to add exogenous chemical reagent, or other building materials of commercialization that above bed mud prepares the common feature of material of construction, and great majority need the technique that combined by pressure sintering, avoid this important principle of economical and energy saving.
About preparing in Material for water treatment with bed mud, the people such as Song Yonghui (Authorization Notice No.: CN102093071B) disclose the method that the heavily contaminated river desilting bed mud modification of a kind of city manufactures haydite, by the bottom mud in lake powder of drying and additive calcium carbonate, water glass and aluminum oxide granulation, make haydite by the mode of sintering; The people such as Ren Zhizhong (notification number: CN101747900B) disclose a kind of method of preparing soil conditioner by carrying out carbonization treatment on lake substrate sludge, and main technical principle is still bed mud is carried out carbonization make renovation agent; (application number: 201410689998.0) disclose method and application that a kind of Dian Chi bed mud prepares sorbent material, by desilting bed mud Chemical Pretreatment, the steps such as carbonization obtain heavy metal absorbent to peaceful equality people; The people such as Li Chunhua (application number: 201410240993.X) disclose a kind of method utilizing bottom mud in lake and waste material additive to prepare water treatment light ceramic, by the bottom mud in lake powder of drying and slag, stalk powder mixing granulation in certain proportion, made by the mode of sintering; The identical people of Zhan (application number: 201210111554.X) discloses a kind of method that bottom mud in lake prepares high-performance water treatment filter material, utilizes the bed mud after lake dredging up and other addO-on therapy, and under certain aperture, pressure condition, sintering makes haydite;(application number: the preparation method 201510413073.8) disclosing water treatment iron-carbon micro-electrolysis ceramics filling, its know-why is also the carbonization carried out under the high temperature conditions by bed mud to Pan Jiafen. In above case, material for water treatment prepared by bed mud does not carry out performance, the comparing of economic aspect with existing finished-product material, has avoided the principle of efficient economy.
About preparing in plant substrates and compost with bed mud, the people such as Cui Baoshan (Authorization Notice No.: CN101828512B) disclose and utilize the making method that bottom mud in lake and cinder are compost, by with cinder screening sized by two kinds of size gradings, it is layered on successively in culture plate, finally spread bottom mud in lake on upper strata, under this patent have ignored the envrionment conditions that bed mud is in reduction for a long time, to the negative influence of seed germination, plant-growth, avoid ventilation, the preserve moisture and fertility usefulness of culture medium simultaneously; The people such as He Qiang (application number: 201410653670.3) disclose a kind of method utilizing riverway sludge to administer stony desertification, namely in riverway sludge, add flyash, mix, spheroid is made with mould, again the rice shoot root system of pioneer plant is imbedded in spheroid, evenly discharging in stony desertification region, this method have ignored the rate of emergence of bed mud equally, it does not have bed mud is carried out pre-treatment; (application number: the method 201210437144.4) disclosing a kind of blue-green algae and polluted bed mud compost altogether, this invention removes the heavy metal in bed mud with the method for bioleaching to the people such as Zhou Lixiang, carries out hybrid composting taking bed mud, stalk, blue-green algae as raw material. This patent only considers the heavy metal in bed mud, avoid the persistence organic pollutant in bed mud, and not providing concrete composting material adding proportion, the judgement criteria of composting process and parameter and compost terminal, stalk and blue-green algae are unfavorable for microorganism growth at the compost initial stage simultaneously.
The people such as Lu Changsong (Authorization Notice No.: CN102060583B) disclose the method for preparing biological carbon soil by static aerobic composting of sludge, by getting fresh municipal sewage plant mud, return batch mixing, sludge composting amendment, make biological carbon soil by certain mass ratio mixing static compost, and biological carbon soil is undertaken by size point grade packaged. But the General Office of the State Council just issues " protection of recent edatope and comprehensive regulation job placement " as far back as in March, 2013; first public proposition in file; in agriculture production; the sewage containing heavy metal, Persistent organic pollutants should be prohibitted the use; and without checking the sludge of sewage treatment plant with safe handling, desilting bed mud etc.; the present invention does not mention the heavy metal in mud, the monitoring and evaluation of persistence organic pollutant matter content in full. Above bed mud prepares plant substrates and compost aspect patent case has all avoided the feasible analysis of ecological use.
In above-mentioned desilting bed mud recycling three kinds of schemes, bed mud is prepared material of construction and is prepared material for water treatment, and owing to preparation cost is higher, social recognition degree is low, the more difficult large-scale engineeringization that realizes is applied; Bed mud is prepared in the technical case of plant substrates or compost, it does not have bed mud carries out the evaluation of pollution substance content as matrix, and what soil science mesostroma possessed preserve moisture and fertility venting capability evaluation. Given this, the present invention is on the basis fully comparing domestic existing bed mud, mud agricultural application standard, first desilting bed mud is proposed, engineering method that feces of livestock and poultry, farm crop dry straw prepare biological carbon soil, final formation has high added value, cost is low, performance good, it may be achieved the biological carbon soil of the scale operation of bed mud.
Summary of the invention
It is an object of the invention to provide the engineering method that a kind of desilting bed mud prepares biological carbon soil, to solve the sediment problem that large scale ecological desilting brings.
For solving above-mentioned purpose, the present invention is by the following technical solutions.
(1) biological carbon soil raw material:
Desilting bed mud: water ratio is between 75��85%, and organic content is between 4��20%, and wherein pollutant load meets the secondary standard of regulation in " soil environment quality standard GB15618-1995 ".
Poultry manure: for argol just, be the one or more combination in cow dung, pig excrement, chicken excrement, duck excrement, goose excrement.
Stalk: be one or more of dry straw in paddy rice, wheat, rape, corn, and be crushed to below particle diameter 5mm.
Protect nitrogen water-holding agent: use one or more in the stalks such as paddy rice, wheat, rape, corn, make through about 600 DEG C destructive distillation when anaerobic or anoxic. There is porosity big, high adsorption capacity, the features such as water holdup height.
Above-mentioned raw materials desilting bed mud, poultry manure, stalk be example 1:(0.2��0.5 in mass ratio): (0.1��0.3), protecting nitrogen water-holding agent addition is 0.5��1% of the quality relative to desilting bed mud, initial C/N is adjusted to about 30: 1, water ratio is 55%��65%, and with turnover throwing machine by raw material Homogeneous phase mixing, prepare bar buttress compost, enter next step.
(2) composting process:
Bar buttress stockyard: being positioned near desilting stockyard, physical features is smooth, width: 3��6m, highly: 1.0��1.6m, length: 10��60m, 10��15m of being separated by between bar buttress. The seepage control measure of bar buttress field: ground is followed successively by 2 layers of antiseepage cloth, and 5��10cm particle diameter is the stone of 2cm, the clay that 5��10cm is thick, and carries out leachate collection measure, and percolate is for regulating the water ratio in composting material and composting process. Bar buttress field rainproof measure: rainproof be bar pile up neatly stockyard construction can unload-type coloured silk steel construction booth, have sunshade and rainproof double effects concurrently.
Temperature: as the long < 10m of stacking, select three measurement point, each point surveys surface respectively, middle, the temperature of bottom, determines to measure the degree of depth according to field condition, and averages; As stockyard > 10m, often increase 10m increase a measurement point, less than 10m by 10m, each point surveys surface respectively, middle, the temperature of bottom, determining to measure the degree of depth according to field condition, and average, temperature measuring frequency is every 6 hours 1 time.
Turning and ventilation: the frequency of turning carries out suitable increase and decrease according to the weather conditions at scene, but be controlled to generally compost early stage, mechanical turning in every 2��5 days once, when heap temperature rises to more than 50 DEG C, to heap body with 0.1��1L.min-1.kg raw material-1Carry out forced ventilation, and turning every day 1��2 time, when being again in below 50 DEG C, bar is piled up neatly turning in every 1��2 day 1 time.
Become thoroughly decomposed: mixing raw material was through 10��15 days 55��65 DEG C of pliotherm periods, and after being down to normal temperature, water ratio is down to less than 40%, when the rate of emergence of composting production is more than 60%, namely thinks and becomes thoroughly decomposed.
(3) biological carbon soil ecology Utilization plan:
After normal temperature is down to by the compost become thoroughly decomposed, bar buttress is spread out 3��7 days when weather allows, so that composting production water ratio is down to minimum, eco-utilization mode comprises and replaces peat as plant cultivation media, the plant growth medium of artificial swamp, ecological floating island, ecological revetment, the modifying agent etc. of desertification, mine soil, but it is not limited to this several mode.
The present invention has the following advantages compared with traditional technology:
1. prepare building materials with Dredged bed mud, prepare compared with material for water treatment technology, the present invention has and does not add chemical reagent, desired raw material, and Dredged bed mud, poultry manure, stalk, biomass carbon all come from solid waste, manufacturing processed economical and energy saving, product biological carbon soil added value height.
2. prepare with Dredged bed mud compared with plant substrates and composting technology, the present invention fully considers that the agricultural of Dredged bed mud utilize feasibility, it is carried out pollution substance Content evaluation and compost maturity, add not only to have simultaneously and protect nitrogen water retaining function, the biomass carbon of the aromatize of soil ulmin in composting process can also be promoted, accelerate the process of biological carbon soil processed.
3. technological process of the present invention simply, easily carries out large-scale engineering application, and invention end-use is relatively wide, social recognition degree height.
Accompanying drawing explanation
Fig. 1 is the general technical route of the present invention
Embodiment
This problem respectively at 2014 4,7,10, basin, position, upstream, Taihu Lake sampled by December and in March, 2015, each sampling point totally 10, (columnar samples divides four layers for collection surficial sediment and columnar samples respectively, every layer of 10cm), and make Duplicate Samples, every time sampling 100,5 totally 500 samples. monitoring result shows, lotus flower swings water system bed mud and belongs to high organic type (quality of organic matter content more than 6%), As in bed mud, Cu, Hg, Cd, Cr, Zn, Pb, the concentration range of Ni is respectively 9.14��25.05, 38.24��98.63, 0.14��0.46, 0.15��0.28, 34.94��110.20, 94.58��185.34, 23.62��110.29, 14.26��36.28mg/kg, in bed mud, phenyl-hexachloride and dichlorodiphenyl trichloroethane concentration are respectively 0.07��0.09, 0.06��0.10mg/kg, owing to regulation soil in " soil environment quality standard GB15618-1995 " will strictly in " in agricultural sludge pollutant catabolic gene standard GB4284-84 " and " urban wastewater treatment firm sludge disposal afforestation shale CJ248-2007 " as agricultural standard, therefore choosing " soil environment quality standard GB15618-1995 " is for according to carrying out desilting bed mud recycling evaluation, the concentration ranges of each pollutent all meets the secondary standard of " soil environment quality standard GB15618-1995 ", and namely this basin desilting bed mud meets the standard that soil agricultural utilize. biological carbon soil is prepared by main raw material of this basin desilting bed mud. concrete steps are as follows:
(1) biological carbon soil raw material:
Above-mentioned desilting bed mud 100t, average moisture content be 72% organic matter average content about 6%, wherein pollutant load meets secondary standard of regulation in " soil environment quality standard GB15618-1995 "; Dried poultrymanure 25t; It is crushed to the dry rice straw 11t of below particle diameter 5mm; Protect nitrogen water-holding agent: use the biomass carbon 0.6t that rice straw is made through about 600 DEG C destructive distillation when anaerobic or anoxic. The average C/N of mixing raw material is 30: 1, and average moisture content is 55%��65%, and with turnover throwing machine by raw material Homogeneous phase mixing, prepares bar buttress compost, enter next step.
(2) composting process:
Bar buttress stockyard: being positioned near desilting stockyard, physical features is smooth, width: 5m, highly: 1.5m, length: 10m, 10m of being separated by between bar buttress, piles two heaps. The seepage control measure of bar buttress field: ground is followed successively by 2 layers of antiseepage cloth, and 10cm particle diameter is the stone of 2cm, the clay that 8cm is thick, and carries out leachate collection measure, and percolate is for regulating the water ratio in composting material and composting process.Bar buttress field rainproof measure: rainproof be bar pile up neatly stockyard construction can unload-type coloured silk steel construction booth, have sunshade and rainproof double effects concurrently.
Temperature: select three measurement point, each point surveys surface respectively, middle, the temperature of bottom, determines to measure the degree of depth according to field condition, and being respectively overhead 0.5,1.0 surfaces measures, and averages.
Turning and ventilation: the frequency of turning carries out suitable increase and decrease according to the weather conditions at scene, but be controlled to generally compost early stage, mechanical turning in every 2��5 days once, when heap temperature rises to more than 50 DEG C, to heap body with 0.5L.min-1Kg raw material-1Carry out forced ventilation, and turning every day 2 times, when being again in below 50 DEG C, bar is piled up neatly turning in every 2 days 1 time.
Become thoroughly decomposed: mixing raw material was through 10��15 days 55��65 DEG C of pliotherm periods, and after being down to normal temperature, water ratio is down to less than 40%, when the rate of emergence of composting production is more than 60%.
Final obtain the every soil science character of former bed mud with biological carbon soil compare in table 1, biological carbon soil has good fertilizer conservation guarantor's water venting capability as shown in Table 1.
Comparing of every soil science character of the former bed mud of table 1 and biological carbon soil
(3) biological carbon soil ecology Utilization plan:
After normal temperature is down to by the compost become thoroughly decomposed, bar buttress is spread out 3��7 days when weather allows, so that composting production water ratio is down to minimum, eco-utilization mode comprises and replaces peat as plant cultivation media, the plant growth medium of artificial swamp, ecological floating island, ecological revetment, the modifying agent etc. of desertification, mine soil, but it is not limited to this several mode.
Claims (10)
1. a desilting bed mud prepares the engineering method of biological carbon soil, it is characterised in that:
(1) taking desilting bed mud, poultry manure, dry straw as raw material, Homogeneous phase mixing by a certain percentage, the C/N ratio of adjustment batch mixing and water ratio, add a certain proportion of guarantor's nitrogen water-holding agent.
(2) in the way of machinery turning combines with static forced ventilation, carry out bar buttress formula compost treatment, about 30 days compost cycle, make bar buttress temperature maintain 10��15 days at 55��65 DEG C, until composting production becomes thoroughly decomposed completely, namely make biological carbon soil.
According to actual needs, (3) biological carbon soil is carried out eco-utilization.
2. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, it is characterized in that the raw material described in (1), desilting bed mud water ratio is between 75��85%, organic content is between 4��20%, and wherein pollutant load meets the secondary standard of regulation in " soil environment quality standard GB15618-1995 ". Poultry manure is the one or more combination in cow dung, pig excrement, chicken excrement, duck excrement, goose excrement, for argol just. Dry straw is one or more in paddy rice, wheat, rape, corn, and is crushed to below particle diameter 5mm.
3. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, its spy is the raw material desilting bed mud described in (1), poultry manure, stalk example 1 in mass ratio: (0.2��0.5): (0.1��0.3) uses turnover throwing machine Homogeneous phase mixing, initial C/N is adjusted to about 30: 1, and water ratio is 55%��65%.
4. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, it is characterized in that the guarantor's nitrogen water-holding agent described in (1) is biomass carbon, for one or more in paddy rice, wheat, rape, cornstalk biological matter carbon, it adds relative to the mass ratio of bed mud is 1: (0.005��0.01).
5. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, it is characterized in that (2) described bar buttress stockyard is positioned near desilting stockyard, physical features is smooth, width: 3��6m, highly: 1.0��1.6m, length: 10��60m, 10��15m of being separated by between bar buttress.
6. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, it is characterized in that the rainproof measure of antiseepage is carried out in (2) institute bar buttress stockyard, antiseepage is followed successively by 2 layers of antiseepage cloth from ground, 5��10cm particle diameter is the stone of 2cm, the clay of 5��10cm, and carry out leachate collection measure, percolate is for regulating the water ratio in composting material and composting process; Rainproof be bar pile up neatly stockyard construction can the color steel construction booth of unload-type, have sunshade and rainproof double effects concurrently.
7. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, it is characterized in that the mode that the mechanical turning described in (2) combines with static forced ventilation, compost is in earlier stage, mechanical turning in every 2��5 days is once, when heap temperature rises to more than 50 DEG C, to heap body with 0.1��1L min-1Kg raw material-1Carry out forced ventilation, and turning every day 1��2 time, when being again in below 50 DEG C, bar is piled up neatly turning in every 1��2 day 1 time, above turning frequency increases in time according to actual ventilation, the weather condition in stockyard or reduces.
8. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, it is characterized in that described in 7, temperature mercurythermometer is measured, its method is, as the long < 10m of stacking, selecting three measurement point, each point surveys surface respectively, middle, the temperature of bottom, determines to measure the degree of depth according to field condition, and averages; As stockyard > 10m, often increase 10m increase a measurement point, less than 10m by 10m, each point surveys surface respectively, middle, the temperature of bottom, determining to measure the degree of depth according to field condition, and average, temperature measuring frequency is every 6 hours 1 time.
9. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, it is characterized in that the standard of becoming thoroughly decomposed described in (2) is that mixing raw material was through 10��15 days 55��65 DEG C of pliotherm periods, and water ratio is down to less than 40% after being down to normal temperature, the rate of emergence of composting production is more than 60%.
10. a kind of desilting bed mud according to claim 1 prepares the engineering method of biological carbon soil, it is characterized in that the eco-utilization described in (3), its step is after normal temperature is down to by the compost become thoroughly decomposed, bar buttress is spread out 3��7 days when weather allows, so that composting production water ratio is down to minimum, eco-utilization mode comprises plant seedling cultivation matrix, the plant growth medium of artificial swamp, ecological floating island, ecological revetment, the modifying agent etc. of desertification, mine soil, but it is not limited to this several mode.
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