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Method for reduction and detoxification of hazardous waste sludge

A technology for waste sludge and sludge, applied in the fields of sludge detoxification, sludge treatment, biological sludge treatment, etc., can solve the problems of secondary pollution reduction effect, long treatment time, high treatment cost, and achieve environmental benefits And the effect of good social benefit, increasing concentration and high sludge reduction rate

Inactive Publication Date: 2019-09-10
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: In view of the problems existing in the prior art, such as high processing cost, long processing time, secondary pollution and poor reduction effect, this application provides a method for reducing and detoxifying hazardous waste sludge

Method used

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  • Method for reduction and detoxification of hazardous waste sludge
  • Method for reduction and detoxification of hazardous waste sludge
  • Method for reduction and detoxification of hazardous waste sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, determine the optimal condition of sludge detoxification

[0036] The sludge used is sewage sludge from a chemical fiber factory. The content of manganese, a toxic substance, and cobalt sulfate, a carcinogen, are 416,000 mg / kg. GB5085.6-2007) is defined as hazardous waste.

[0037] The method for reducing and detoxifying hazardous waste sludge includes the following steps:

[0038] The water content of the mud was 84.2% through plate and frame pressure filtration, and four batches were fed continuously. The first batch of materials was directly added with the above-mentioned sludge, auxiliary materials sawdust and microbial agents, wherein the amount of auxiliary materials added sawdust was 2% of the dry weight of the sludge. 50%, mixed evenly; the amount of microbial agent added is 2% of the dry weight of the sludge, and it is added at one time. The second batch of materials is directly added with the same amount of sludge and auxiliary material shaving...

Embodiment 2

[0043] Continuous reaction effect under embodiment 2, optimum condition

[0044] The mixed feed is added at one time, and the dosage of the biological agent accounts for 4% of the dry weight of the sludge. The microbial agent is 30 parts of Bacillus stearothermophilus photosynthetic bacteria, 15 parts of Sinibacillus, 15 parts of Bacillus SPP., 10 parts of photosynthetic bacteria, 10 parts of lactic acid bacteria, 10 parts of actinomycetes and 10 parts of fungi. The set temperature of the equipment is 60°C, the sludge is aerated by forced ventilation, the ventilation rate is 0.55L / min, and 20 batches are continuously reacted.

[0045] Real-time measurement of processing effects, image 3 For the dehydration effect of continuous reaction, it can be seen that in the continuous reaction process, the dehydration rate of each batch is basically consistent, but with the continuous reaction, the degree of dehydration is getting higher and higher, and the dry matter reduction rate re...

Embodiment 3

[0046] Continuous reaction effect under embodiment 3, optimum condition

[0047] The mixed feed is added at one time, and the dosage of the biological agent accounts for 4% of the dry weight of the sludge. The microbial agent is 35 parts of Bacillus stearothermophilus photosynthetic bacteria, 15 parts of Sinibacillus, 10 parts of Bacillus SPP., 10 parts of photosynthetic bacteria, 10 parts of lactic acid bacteria, 10 parts of actinomycetes and 10 parts of fungi. The set temperature of the equipment is 75°C, the sludge is aerated by forced ventilation, the ventilation rate is 0.6L / min, and 20 batches are reacted continuously. The treatment effect was measured in real time. During the continuous reaction, the dehydration rate of each batch remained basically the same, but as the continuous reaction proceeded, the degree of dehydration became higher and higher. The dry matter reduction rate reached 18%, and the detoxification rate was 9%. The moisture content of the sludge is 30...

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Abstract

The invention discloses a method for reduction and detoxification of hazardous waste sludge. The method comprises the steps: adding a microbial bacterial agent to the sludge, adding an auxiliary material for conditioning, providing an external heating source, performing continuous stirring, and performing aeration, wherein the sludge is chemical hazardous waste sludge with a water content of 80% or above, the water content is 70% after the auxiliary material is added, and the microbial bacterial agent is complex bacteria. According to the method, bio-thermal energy generated through degradation of organic matter in the microorganism high-temperature process and the complex bacteria are utilized to decompose the organic matter, destroy the aggregate structure and disperse the sludge particles, the interstitial moisture and surface moisture are turned into free water, the binding force is weakened, and the removal difficulty is reduced; and in addition to the auxiliary heat, the temperature inside a box body is kept at 60-80 DEG C. According to the method, the optimal control conditions in the process of reduction and detoxification are determined, the method has the advantages of ahigh degree of reduction, high detoxification efficiency, low treatment cost, a high comprehensive utilization rate, no secondary pollution, simple operation and the like, and the economy benefits, environmental benefits and social benefits are good.

Description

technical field [0001] The invention belongs to sludge treatment technology, in particular to a method for reducing and detoxifying hazardous waste sludge. Background technique [0002] Chemical enterprises produce a large amount of sludge, which has the characteristics of high moisture content, large total amount, and most of them are hazardous waste and high toxicity. In recent years, the state has improved the standardization of disposal of hazardous waste sludge. On August 1, 2016, the "National Hazardous Waste List" was implemented. Among them, there are 93 types of hazardous waste related to sludge. The cost of hazardous waste sludge incineration is extremely high, at 8,000 yuan / ton, while the "Environmental Protection Tax Law" implemented in 2018 added a hazardous waste tax of 1,000 yuan / ton. The cost and pressure of chemical sludge treatment have greatly increased, and the reduction of chemical sludge in enterprises is imminent. The bottleneck of chemical hazardous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/121C02F11/02
CPCC02F11/121C02F11/02C02F11/004
Inventor 边博沈悦胡修韧张利民田甘沛
Owner NANJING NORMAL UNIVERSITY
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