Method for comprehensively utilizing sludge in recycling mode

A technology of recycling and sludge, applied in the direction of biological sludge treatment, etc., can solve the problems of high sludge cost, secondary pollution of soil, generation of fly ash and smoke, etc., achieve reduction of CO2 emissions, high degree of fermentation, fermentation fast effect

Inactive Publication Date: 2011-11-23
GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the sludge contains a large number of toxic and harmful substances that are difficult to degrade, such as pathogenic bacteria, parasites, non-ferrous metals, and organic pollutants, the abuse of sludge without stabilization and harmless treatment may cause secondary pollution of the soil, and then pass through the food chain. Harmful to human health
[0006] (2) Landfill needs to find a suitable site, and these sites are often not suitable for finding. At the same time, harmful components in the sludge will leak into the groundwater and cause pollution. At the same ti

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 7 parts of urban sludge (water content 72%) after dehydration, deodorization and sorting, 2 parts of mixed materials of food residues, domestic garbage, human and animal manure (water content 42%) and 1 part of reused loose sludge (moisture content 25%) %), mixed in a boiler-flow pressurized mixing mixer, pressurized to 5.5 MPa, and heated to 43°C, the moisture content of the sludge dropped to 63%, and then sent to the fermentation tank to heat up and ferment. The high-temperature fermentation temperature is 60~ The temperature was maintained at 75°C for 4 days, the total fermentation time was 9 days, the moisture content of the sludge was reduced to 22%, and loose sludge was obtained.

[0039]9 parts of the loose sludge and 1 part of coal are mixed as fuel, and the calorific value is 48% of standard coal (the calorific value of standard coal is 7000 kcal / kg).

[0040] The loosened sludge is sent to drying to make compost, and the index is as follows:

[0041] .

Embodiment 2

[0043] 8 parts of urban sludge (water content 75%) after dehydration, deodorization and sorting, 1 part of mixed materials of food residue, domestic garbage, human and animal manure (moisture 40%) and 1 part of reused loose sludge (water content 25%) %), mixed in a boiler-flow pressurized mixing mixer, pressurized to 6.0 MPa, heated to 46°C, the moisture content of the sludge dropped to 65%, and then sent to the fermentation tank to heat up and ferment. The high-temperature fermentation temperature is 60~ The temperature was maintained at 78°C for 4 days, the total fermentation time was 9 days, the moisture content of the sludge was reduced to 24%, and loose sludge was obtained.

[0044] 9 parts of the loose sludge and 1 part of coal are mixed as fuel, and the calorific value is 44% of standard coal (the calorific value of standard coal is 7000 kcal / kg).

[0045] The loosened sludge is sent to make compost or dry to make compost, and the indicators are as follows:

[0046] ...

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Abstract

The invention discloses a method for comprehensively utilizing sludge in a recycling mode. The method comprises the following steps: dewatering sludge of a municipal wastewater treatment plant; respectively analyzing and detecting dewatered sludge, food residues, domestic garbage and human and animal excreta, and deodorizing simultaneously; sorting the deodorized sludge, food residues and domestic garbage; mixing the sludge, the food residues, the domestic garbage, the human and animal excreta, crop straws with reused fluffy sludge in a certain ration at 5-6MPa; meanwhile, controlling stirring temperature to 40-45DEG C until the moisture content of the mixture is 55-65wt%; carrying out aerobic fermentation on the mixture in a fermentation tank for 6-7 days to obtain the fluffy sludge; andcarrying out aftertreatment on the fluffy sludge to obtain fertilizer or fuel. The method has the effects of high fermentation degree, high fermentation speed and the like and is environmentally friendly, and the fertilizer or fuel obtained by aftertreatment can be used for improving soil or saving energy.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for comprehensive utilization of sludge resources. Background technique [0002] In recent years, with the rapid development of my country's economic construction and the enhancement of people's awareness of environmental protection, the country has formulated stricter and feasible standards for sewage discharge, and built various types and scales of sewage treatment plants. The problem is how to provide for these sewage plants. Separation of matter—sludge looking for a way out. [0003] In our country, due to economic and technical reasons, there is no stable and reasonable outlet for sludge at present. Some data show that about 90% of the built sewage treatment plants do not have supporting facilities for sludge treatment, and more than 60% of the sludge is directly used for agriculture without any treatment, and the digested sludge is also due to the lac...

Claims

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Application Information

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IPC IPC(8): C02F11/04
Inventor 吴阳东王永成
Owner GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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