JPS5855098A - Freeze thaw type treating device for sludge - Google Patents

Abstract

PURPOSE:To facilitate a dehydration treatment and to simplify post disposition by mixing the separated liquid formed by dehydration of initially settled sludge with a decanter and the excess sludge formed in a final settling basin, concentrating the mixture and subjecting the same to a freeze thaw treatment and a dehydration treatment. CONSTITUTION:The separated liquid of about 70% dehydrated cake and separated liquid formed in a decanter 8 for dehydration and the excess sludge formed in a final settling basin 3 are mixed in a mixing tank 9. The mixture is concentrated to 90-95% high recovery rate by a decanter for concentration to obtain 7-8% concd. sludge; thereafter the pH index of the concd. sludge is decreased by 2-2.5% by a pH controller 5. Further the sludge is modified to sludge having good dehydrating and filtering peroperties with a freeze thaw treating device 6 and is then dehydrated with a dehydrator 7, whereby dehydrated cake contg. water at 75-80% is obtained.

Description

[Detailed Description of the Invention] This invention is applicable to sludge such as sewage.
This relates to a freeze-thaw type sludge treatment in which the sludge is separated into water and solids by heating and melting after condensation, and this sludge is dehydrated.
It is an object of the present invention to provide a freeze-thaw type sludge treatment apparatus which facilitates dehydration treatment and facilitates post-disposal by separating initial settling sludge and surplus sludge.

Figure 1 shows a conventional sludge treatment m1ii*t- of this kind, in which sludge such as sewage is led to an initial precipitation pond and co-precipitated, and then this sludge is tested using a concentration decanter 14). Concentrated sludge TPL (hydrogen ion index) generated in decanter (41) II
4 Adjustment device 15J (add a predetermined amount of sulfur* to l1 sludge and adjust the pH to 15J to make the solid content concentration 2- to 2.5-)
1177KjO
It is configured as L12, which performs dehydration treatment and produces dehydrated ku-doshi with a moisture content of 75 to 80. - 10,000, above initial settling tank (!
The supernatant liquid obtained by sedimentation and separation of the rms fraction in Step 1 is processed in T8 sludge treatment unit (2) until it can be discharged, but during this treatment process, microorganisms affect the flocs. In order to cause sedimentation, the final sedimentation tank (3 layers) is designed to lead to the final sedimentation tank (3 layers).
), most of the sludge produced in the activated sludge (21) is returned as the returned sludge (61).
Return to n or the -sK generated sludge, c
Initial settling tank +1 as rtteltl sludge (62)
1. The sludge is fed into the sludge to be co-sedimented with the initial settling sludge.

The mixed sludge produced in this way is transferred to the condensing decanter (4) K4, and in this IllI condensing decanter, it is heated to a concentration of 1 [8 to 91111].
n, sulfuric acid with j6 pH 11 adjustment device 45) KL with pR index t-2 ~ 2.5% 1N111VC, lower ft@t, Ct
y) After reforming the sludge into a sludge with good dewatering and filterability in the freeze-thaw treatment equipment (6), it is dehydrated in the first stage of dehydration JaLl), and the water content is 75 s~
It is designed to make 80-g of dehydrated ku-boshi.

Conventional (/J Sukhnoji treatment equipment IL & Teisha, above-mentioned L
Initial sedimentation subunoji generated in UtC1 initial sedimentation basin (1-) and final sedimentation basin 131 fζ
The surplus sludge is mixed in the initial settling tank 111c, and is not only difficult to dehydrate compared to the initial settling sludge, but also in the initial settling tank 11JK.
Because the mixing ratio of excess sludge in the final settling tank (3) is not accurate, the mixed sludge with the initial settling tank (3) is not accurate.
There is a big difference in the modified young fruits when using 4611A, and it is the luck of local equipment! The disadvantage of the IIT control station is that it is extremely cumbersome, and the above-mentioned initial settling sludge and surplus sludge are mixed together before being subjected to freeze-thaw processing (61), so the processing cost increases as the amount of processing increases. Tori (Φ)

C-, D* 44 rx, a-';h'-6 points, arrival aL
re'JR*4fJC1 This is intended to provide a freeze-thaw sludge treatment method that eliminates the various drawbacks of LDJc4 in separating the initial settling sludge and surplus sludge as described above.

That is, although FIG. 2 shows one embodiment of the present invention, the same reference numerals as those in the above-mentioned conventional system (FIG. 1) refer to the same constituent members, and the numerals 7 and 7 are omitted.

(8) is a dewatering decanter that dehydrates the rt* initial settling sludge generated in the initial settling tank tlj for 16 seconds, and the 7θ1IIj! t
Of the dehydration and separation liquid of IL&, -10,000 separation liquid,
Surplus sludge generated in the final settling tank 131 and t
After mixing in the S sludge (9) and using a conventional III fine decanter (#Qin with a high recovery rate of 90 to 95 - 1 in 43) to obtain a fine sludge of 7 to 8%, Sfutsuji pH index kpHg* equipment (51 to 1 ton) for lowering 2 to 2.bdTL, and freezing** purchasing equipment (61 for dewatering and reforming to a transparent and clean sludge. Stage dehydrator 173
The freezing method of this invention is made by dehydration treatment using a K process to create a dehydrated r-Ushikura with a moisture content of 75 to 80.
11 Initial settling sludge generated at the initial settling pond in the above-mentioned 11.
8).

The separated liquid produced in the dehydration decanter (II) and the excess sludge produced during the gradation phase and the beard surplus sludge (91) are heated and then heated in the concentration decanter (4) (5). 1. From sea urchin nine, the cold field load of the freeze-thaw sludge treatment equipment can be greatly reduced, contributing to the reduction of cleaning costs.
Further, according to the present invention, since the initial settling sludge and the surplus sludge are treated separately, it has the effect that both the dewatering process and the post-processing are significantly simplified. Furthermore, according to this invention, compared to conventional heat treatment means that combine initial settling sludge and excess sludge, since both sludges are separated, the stability during dewatering and treatment is extremely good, and the treatment equipment is It also has the effect of making driving easier.

[Brief explanation of drawings]

Fig. 1 is a system block diagram showing a conventional freezing/thawing sludge ring device, and Fig. 92 is a system block diagram showing an embodiment of the present invention. In the drawing, (IJ lamp initial settling tank, (2) activated sludge Asahi Jll, (31 final settling tank, (31 company return sludge, L52) surplus sludge, (4J Im! Satin decanter, (61) is the amount of pH Seki Toyoya silver (61 is the freeze-thaw processing equipment, (1) is the dehydrator, (8) is the dehydration decanter, and (9) is the mixing bowl. In addition, the same reference numerals in the figure and the same 17t are mutually exclusive. The following parts are shown below: Agent Makoto Kuzuno - Writ of amendment to the demarcation procedure (spontaneous) Indication by the Director-General of Patent Application 156-1158832 Name of freeze-thaw sludge treatment device 6, "Patent" in the specification to be amended “Claims” and “Detailed Description of the Invention”
Each column. 6. Contents of amendment 1) Amend the "Claims" of the specification by adding a separate sheet. 2) "The pH index of the concentrated sludge is lowered" on page 2, lines 16 to 19 of the specification is corrected as follows. r Lower the pH of the concentrated sludge using a pH adjustment device (5) (a device that adds sulfuric acid to the concentrated sludge until the pH reaches 2 to 2.5 to create a uniform pH-adjusted sludge); 3) Set the rpn index on page 3, lines 18 and 19 of the specification to 2.
"to about 2.5 degrees" is corrected to "rpn to 2 to 2.59 degrees." 4) In the specification, page 5, line 9, "one of the separation liquids" is corrected to "the separation liquid." 6) Orpg index on page 5, lines 13-14 of the specification is p1
1111 to 2 to 2.5 using the scissor set (5), and correct the rpH to 12 to 2.5 using the pH adjuster (5). "Claims" (Amendment) (1) The initial settling sludge produced in the initial settling tank is dehydrated by a dewatering decanter, and the separated liquid produced by this dewatering decanter and the separated liquid produced in the final settling tank are separated. Freeze-thaw sludge treatment characterized by mixing surplus sludge in a mixing tank, concentrating it in a concentration decanter, and sequentially sending it to a freeze-thaw treatment device and a dehydrator through a pit adjustment device in the next stage. Device. (2) The freeze-thaw sludge treatment apparatus according to claim 1, wherein a dewatering decanter is used to produce a dewatering cooler with a content of 10 sludge. (3) The freeze-thaw sludge treatment apparatus according to claim 1, characterized in that the concentration decanter produces concentrated sludge with a compatibility of 92 to 93. (4) 1Jxsllt2 to 2.5 with pH adjustment device
The freeze-thaw flange type sludge treatment device according to claim 1, characterized in that the sludge treatment device is configured to lower i-. Procedural amendment (spontaneous) Director General of the Patent Office 1, Indication of case Patent application 1558323/1983,
Representative Hitoshi Katayama of the person making the amendment Dept. 4, Agent 5, Column 6 of "Claims" of the specification to be amended, Amendment by adding the "Scope of claims" of the description of the amendment to a separate sheet do. (1) The initial settling sludge produced in the initial settling tank is dehydrated using a dewatering decanter, and the separated liquid produced by the dewatering decanter and the surplus sludge produced in the final settling tank are mixed in a mixing tank. A freeze-thaw type sludge treatment device characterized in that the sludge is concentrated in a concentrating decanter and sequentially sent to a freeze-thaw treatment device and a dehydrator through a pH adjustment device in the next stage. (2) A freeze-thaw sludge treatment apparatus according to claim 1, characterized in that the dewatering decanter produces a dehydrated cake with a moisture content of around 7 (about 1) (3) Concentration The freeze-thaw sludge treatment apparatus according to claim 1, characterized in that the decanter produces concentrated sludge with a moisture content of 92 to 95%. (4) The pH adjustment device lowers the pH to 2. 2. The freeze-thaw sludge treatment apparatus according to claim 1, wherein the sludge treatment apparatus is configured to lower the temperature to 2.5.

Claims (1)

[Scope of Claims] The separated liquid produced by the dewatering decanter and the surplus sludge produced in the final settling tank are mixed in a mixing tank, and then the dewatering process is carried out in a decanter for concentration. Concentrate with 7 ta. Amount of silver processed by the freeze-thaw method sludge processing is characterized in that the next stage pf (Preparation 11@) is troweled and sent to the freeze-thaw treatment equipment and water pump. (After 70 IslII in the 2B dewatering decanter The freeze-thaw sludge treatment apparatus according to claim 1, wherein the dehydrated sludge treatment apparatus is adapted to produce dehydrated sludge tq# mold. - Freezing AIIT thawing type sludge processing apparatus according to claim 8, item 1, characterized in that the pH adjusting device has a Kjo pH index of 2 to 2.51.
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! ! 11. Freeze-thaw sludge treatment device according to item 11.