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Nitrogen and phosphorus retention composting method of municipal domestic sludge

A technology of municipal domestic sludge and composting method, which is applied in the field of sludge treatment, can solve the problems of nitrogen loss, nutrient loss and waste, secondary pollution, etc., to reduce the loss of nutrients, promote cracking reactions, and reduce ammonia gas Volatile effect

Inactive Publication Date: 2021-04-30
SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, landfill disposal has gradually begun to be restricted; land utilization is mainly after composting, and composting methods include stacked composting, trough composting, and tower composting, all of which occupy a large area and the land utilization rate is not high. problems, and the composting process is likely to produce ammonia volatilization, resulting in nitrogen loss, or precipitation of water-soluble phosphorus elements, thereby reducing fertilizer utilization; while the research on sludge incineration technology mainly focuses on water evaporation and volatilization during the incineration process Analyzing, combustion characteristics and pollutant migration rules, etc.; building material utilization research includes sludge production of asphalt, brick production, ceramsite production, concrete production, ecological cement production, biochemical fiberboard production, etc., but there are many equipment and complex processes. , High cost of waste treatment, greatly affected by changes in environmental conditions, slow recovery once disturbed, etc. In addition, the requirements for staff are very high
In terms of other resource utilization of sludge, there are mainly technologies such as synergistic digestion of sludge and organic matter to produce biogas, sludge pyrolysis carbonization, sludge pyrolysis gasification, and sludge phosphorus recovery. However, the resource utilization rate of current technologies is not high. , nutrient loss and waste, large waste discharge, easy to cause secondary pollution and other problems, it is difficult to achieve the effect of resource utilization of pollution

Method used

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  • Nitrogen and phosphorus retention composting method of municipal domestic sludge
  • Nitrogen and phosphorus retention composting method of municipal domestic sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A nitrogen- and phosphorus-conserving composting method for municipal domestic sludge, comprising the steps of:

[0029] (1) Mix municipal domestic sludge and auxiliary materials at a mass ratio of 1:1 to obtain compost raw materials, then add 0.05% of its mass yeast and 0.1% of its mass stabilizer to the compost raw materials to fully mix, and mix well compost; the auxiliary material is a combination of straw, poultry and livestock manure, and alcoholic fermentation residues in a mass ratio of 20:4:1; the stabilizer is ferrous sulfate, 2-amino-4-chloro-9-methyl Pyridine is combined according to the mass ratio of 1:5;

[0030] (2) Monitor the temperature of the compost when composting, and when the internal temperature of the compost is ≥ 40°C, start turning over, continue to stand still and heat up after turning over, and detect the internal temperature of the compost in time, whenever the internal temperature is higher than 40°C Stir once, add protective agent every ...

Embodiment 2

[0033] A nitrogen- and phosphorus-conserving composting method for municipal domestic sludge, comprising the steps of:

[0034] (1) Mix municipal domestic sludge and auxiliary materials according to the mass ratio of 5:1 to obtain compost raw materials, then add 0.08% of its mass yeast and 0.3% of its mass stabilizer to the compost raw materials to fully mix, and mix well compost; the auxiliary material is a combination of straw, poultry and livestock manure, and alcohol fermentation residues in a mass ratio of 40:8:1; the stabilizer is a combination of ferrous sulfate and potassium azide in a mass ratio of 3:1 ;

[0035] (2) Monitor the temperature of the compost when composting, and when the internal temperature of the compost is ≥ 40°C, start turning over, continue to stand still and heat up after turning over, and detect the internal temperature of the compost in time, whenever the internal temperature is higher than 40°C Stir once, add protective agent when stirring each...

Embodiment 3

[0038] A nitrogen- and phosphorus-conserving composting method for municipal domestic sludge, comprising the steps of:

[0039] (1) Mix municipal domestic sludge and auxiliary materials according to the mass ratio of 3:1 to obtain compost raw materials, then add 0.06% of its mass yeast and 0.2% of its mass stabilizer to the compost raw materials to fully mix, and mix well compost; the auxiliary material is a combination of straw, poultry and livestock manure, and alcohol fermentation residues in a mass ratio of 30:5:1; the stabilizer is ferrous sulfate, 2-amino-4-chloro-9-methyl The combination of pyridine and potassium azide according to the mass ratio of 2:3:1;

[0040](2) Monitor the temperature of the compost when composting, and when the internal temperature of the compost is ≥ 40°C, start turning over, continue to stand still and heat up after turning over, and detect the internal temperature of the compost in time, whenever the internal temperature is higher than 40°C ...

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Abstract

The invention provides a nitrogen and phosphorus retention composting method of municipal domestic sludge, which belongs to the technical field of sludge treatment, and comprises the following steps: adding auxiliary materials, saccharomycetes and a stabilizer into municipal domestic sludge, composting, monitoring the temperature of the compost during composting, carrying out temperature-controlled fermentation, controlling the temperature of the first stage of composting to be within 40 DEG C, and adding a protective agent to assist fermentation, in the second stage of composting, the temperature is controlled to be within 50 DEG C, and exogenous microbial inoculants are used for auxiliary fermentation. According to the method, a step-by-step fermentation method is adopted, the combined action of the stabilizer, the protective agent, the exogenous microbial agent and the like is utilized, the effects of nitrogen fixation and phosphorus fixation are achieved, nitrogen and phosphorus loss is reduced, the fertilizer fermentation efficiency is improved, and a new direction is provided for sludge treatment.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, in particular to a nitrogen- and phosphorus-contained composting method for municipal domestic sludge. Background technique [0002] The sludge produced by sewage treatment is very complex. It is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. In addition to containing a large amount of water, there are also refractory organic matter and heavy metals. , salts and pathogenic microorganisms and parasites, eggs, etc. If the sludge is not effectively disposed of, it may cause the following hazards: pathogen pollution, excessive salt pollution, excessive nitrogen and phosphorus pollution, organic polymer pollution and heavy metal pollution. These pollutions will eventually affect water bodies and soils, damage plant roots, easily accumulate toxicity in crops, animals and humans, and pollute the environment. It can be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05F17/20C05F17/50C05F17/70
CPCC05D9/00C05F17/20C05F17/50C05F17/70C05G3/00C05F3/00C05F5/006C05F5/008C05F7/00C05F11/08Y02W30/40
Inventor 徐荣乐宋晓薇刘凯覃楠钧黄业翔韦士程吴镇周良洁田媛刘文杰
Owner SCI RES ACADEMY OF GUANGXI ENVIRONMENTAL PROTECTION
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