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Process method for achieving energy regeneration and reclamation of sludge in digestion tank through three-phase reaction

A technology of three-phase reaction and process method, which is applied in the direction of chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve the problems of prolonging the treatment chain, waste of resources, failure to realize resource utilization and energy utilization, and achieve environmental protection Good benefits, cost reduction, good environmental and economic benefits

Inactive Publication Date: 2011-10-12
黄杉琴 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The former of the above-mentioned literature outlines the conventional treatment method, which only prolongs the treatment chain and classifies it without realizing final treatment, which increases the burden on sewage treatment plants and landfills, and also causes a huge waste of resources; the latter Try to dispose of it locally without increasing the cost of follow-up treatment, mainly for the purpose of harmlessness and reduction, without realizing resource utilization and energy utilization
However, there are few studies on the technology of energy and resource utilization of septic tank sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A three-phase reaction method for realizing energy and resource utilization of septic tank sludge. The preparation steps of the method are as follows:

[0029] First remove the impurities from the obtained high-concentration (TS=15%±2%) urban septic tank sludge, adjust it to TS=6%, and stir evenly;

[0030] The second step is to enter the hydrolysis phase, heat the waste heat from the metallurgical industry to 102°C for 30 minutes, and then use 180W ultrasonic treatment for 50 minutes;

[0031] In the third step, the product of the hydrolysis phase enters the acidification phase, and is decomposed by acidification bacteria at a constant temperature of 35°C, and the residence time is 48h;

[0032] In the fourth step, the product of the acidification phase enters the methanogenic phase, and is anaerobically fermented at a constant temperature of 50.0°C with a residence time of 7 days;

[0033] The fifth step is to collect the biogas, desulfurize it and transport it to th...

Embodiment 2

[0035] First remove the impurities from the obtained high-concentration (TS=15%±2%) urban septic tank sludge, adjust it to TS=7%, and stir evenly;

[0036] The second step is to enter the hydrolysis phase, thermally hydrolyze for 30 minutes at 107°C with waste heat from the power industry, and then use 180W ultrasonic treatment for 55 minutes;

[0037] In the third step, the product of the hydrolysis phase enters the acidification phase, and is decomposed by acidification bacteria at a constant temperature of 37°C, and the residence time is 48h;

[0038] In the fourth step, the product of the acidification phase enters the methanogenic phase and undergoes anaerobic fermentation at a constant temperature of 52.0°C with a residence time of 7 days;

[0039] The fifth step is to collect the biogas, desulfurize it and transport it to the user, and the fermentation residue (biogas slurry and residue) produced is filled and returned to the field.

Embodiment 3

[0041] First remove the impurities from the obtained high-concentration (TS=15%±2%) urban septic tank sludge, adjust it to TS=8%, and stir evenly;

[0042] The second step is to enter the hydrolysis phase, heat the waste heat of the cement industry to 105 ° C for 30 minutes, and then use 180W ultrasonic treatment for 60 minutes;

[0043] In the third step, the product of the hydrolysis phase enters the acidification phase, and is decomposed by acidification bacteria at a constant temperature of 40°C, and the residence time is 48h;

[0044] In the fourth step, the product of the acidification phase enters the methanogenic phase and undergoes anaerobic fermentation at a constant temperature of 55.0°C with a residence time of 7 days;

[0045] The fifth step is to collect the biogas, desulfurize it and transport it to the user, and the fermentation residue (biogas slurry and residue) produced is filled and returned to the field.

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Abstract

The invention discloses a process method for achieving energy regeneration and reclamation of sludge in a digestion tank through a three-phase reaction. In the method, a raw material is pre-treated, the concentration of a dry matter in a reaction liquid is regulated to 6-8%, and then the three-phase reaction is carried out. The three-phase reaction comprises the following steps: applying a hydrolysis phase through using a composite physical external filed, wherein the ultrasonication is carried out for 50-60 minutes at the power of 180 W, heat treatment is carried out for 30 minutes at 102-107 DEG C, and the heat treatment is firstly carried out and then the ultrasonication is carried out; enabling the hydrolysis phase product to enter into an acidifying phase and staying for 24 hours at the temperature of 35-40 DEG C under the action of acidifying bacteria; and enabling the acidifying phase product to enter into an alkane producing phase, staying for 7 days at the constant temperate of 50-55 DEG C under the action of alkane producing bacteria, collecting methane, and carrying out depth treatment on biogas slurry and biogas residue as an energy source and a fertilizer. According to the invention, reaction period is short, the produced energy and organic fertilizer are high in quality, industrial low-temperature residual heat resources are fully utilized, wastes are turned into wealth for the sludge in a digestion tank, and the load of a municipal sewage treatment system is reduced, thus the process method has good economic, social and ecological benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection energy, and relates to a process method for realizing energy and resource utilization of urban septic tank sludge by three-phase reaction. Background technique [0002] 1) Conventional practice of septic tank sludge treatment and disposal [0003] In the treatment of septic tank sludge, at present, the main purpose is to make it harmless. Through regular cleaning, it is transported to the feces disposal station, and the separated solid is sent to the landfill through the solid-liquid separation system. The mud is sent to the sewage treatment plant (Qin Feng, Chai Xiaoli. Feces treatment and disposal technology [M]. Beijing: Chemical Industry Press, 2006: 34-44); some scholars have also begun to explore the reduction technology of septic tank sludge, Reducing VS, TS, COD and other biochemical indicators by adding biological agents to septic tanks (Song Zhenxia. Research on microbi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04
CPCY02E50/30
Inventor 黄杉琴董建韦波雷维群熊熙然汪兴冯凯
Owner 黄杉琴
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