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Method for recycling sludge

A technology for recycling and sludge, applied in the field of environmental pollution treatment, can solve the problems that have not yet been discovered, and achieve the effect of improving the separation effect of mud and water, realizing high-efficiency removal rate, and realizing the effect of reducing quantity.

Inactive Publication Date: 2011-02-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, no use of Ca(OH) has been found 2 A report on improving the production of short-chain fatty acids by anaerobic fermentation of sludge, reducing the amount of sludge and efficiently separating sludge from fermentation broth and removing phosphate in fermentation broth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Get the remaining sludge (TSS is 12g / L, VSS is 8.4g / L, moisture content 98%, pH=6.84) and 6.6gCa(OH) that 27.5L municipal domestic sewage plant concentrator produces 2 (2% of the total amount of sludge dry weight) after mixing, then drop into an anaerobic fermentation reactor, stir to make the sludge evenly mixed, and carry out anaerobic fermentation in an anaerobic fermentation reactor at a temperature of 21 ± 1°C;

[0033] (2) Take out 2.5L (1 / 11 of the total mixture volume) fermented mud-water mixture from the anaerobic fermentation reactor every 20 hours, and add 2.5L fresh urban sewage plant concentration pool to the anaerobic fermentation reactor to produce The remaining sludge is used as fermentation sludge, supplemented with solid Ca(OH) 2 2.1g / L (supplemented solid Ca(OH) 2 The quality is 7% of fresh sludge dry weight);

[0034] (3) In the 2.5L fermented mud-water mixture that takes out, add the FeSO that concentration is 45g / L 4 Solution 0.09L, (add FeS...

Embodiment 2

[0037] (1) Get the remaining sludge (TSS is 24g / L, VSS is 16.8g / L, moisture content is 98%, pH=6.84) and 27gCa(OH) that 45L municipal domestic sewage plant concentrator produces 2 (2.5% of the total dry weight of the sludge) is mixed and put into an anaerobic fermentation reactor, stirred to make the sludge evenly mixed and carried out anaerobic fermentation under the condition of 21 ± 1°C;

[0038] (2) Take out 2.5L (1 / 18 of the total mixture volume) fermented mud-water mixture from the anaerobic fermentation reactor every 22 hours, then add 2.5L of fresh urban domestic sewage plant concentration pool to produce in the anaerobic fermentation reactor Excess sludge and solid Ca(OH) 2 16.2g (i.e. Ca(OH) 2 The quality is 27% of added fresh sludge dry weight);

[0039] (3) In the 2.5L fermented mud water mixture that takes out, add the FeSO that concentration is 15g / L 4 Solution 0.21L (i.e. adding FeSO 4 The quality of the mixed sludge is 5.4% of the dry weight of the mixed sl...

Embodiment 3

[0042] (1) Get the remaining sludge (TSS is 20g / L, VSS is 14g / L, moisture content 98%, pH=6.84) and 17.5g Ca (OH) that 35L municipal sewage plant concentrator produces 2 (2.5% of the total dry weight of the sludge) is mixed and put into an anaerobic fermentation reactor, stirred to make the sludge evenly mixed and carried out anaerobic fermentation under the condition of 21 ± 1°C;

[0043] (2) Take out 2.5L (1 / 14 of the total mixture volume) fermented mud-water mixture from the anaerobic fermentation reactor every 24 hours, then add 2.5L of fresh urban domestic sewage plant concentration pool to produce in the anaerobic fermentation reactor Excess sludge and solid Ca(OH) 2 8.5g (ie Ca(OH) 2 The quality is 17% of added fresh sludge dry weight);

[0044] (3) Add the FeSO concentration of 30g / L in the 2.5L fermented mud-water mixture that takes out 4 Solution 0.15L (ie adding FeSO 4 The quality of the mixed sludge is 9.6% of the dry weight of the mixed sludge), first stirred at...

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PUM

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Abstract

The invention discloses a method for recycling sludge, comprising the following steps of: mixing the sludge with Ca(OH)2, placing the mixture into an fermentation reactor and stirring and performing anaerobic fermentation; discharging a certain volume of fermentation mixture from the reactor at regular time intervals, and adding fresh sludge in the same amount as the discharged mixture and a certain amount of Ca(OH)2; and adding a FeSO4 solution into the discharged mixture, stirred for a certain time, adding a polyacrylamide solution, stirring for a certain time, and then carrying out filter pressing for dewatering. The method remarkably improves the concentration and the fermentation liquor amount of short chain fatty acid generated by the sludge, decreases the volatile substances of the sludge, and meanwhile, can remove most phosphate in the fermentation liquor.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution treatment, and in particular relates to a method for recycling sludge. Background technique [0002] Activated sludge nitrogen and phosphorus removal technology is one of the key technologies to solve the problem of eutrophication. However, the activated sludge process will produce a large amount of excess sludge, the total amount of which accounts for about 0.3-0.5% of the treated water (based on a water content of 97%), and the sludge treatment cost accounts for about 20% of the investment and operating costs of the sewage treatment plant. ~60%. How to realize the recycling and reduction of sludge is of great significance to sewage plants. [0003] The influent COD of urban sewage plants is relatively low, and the content of short-chain fatty acids (SCFAs) that can be easily utilized by microorganisms for nitrogen and phosphorus removal is lower, which seriously affects the eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/04
Inventor 陈银广李响陈红胡兰芳顾国维
Owner TONGJI UNIV
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