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Method for preparing organic fertilizer from excess activated sludge and wood waste

A technology of residual activity and wood waste, applied in the preparation of organic fertilizers, organic fertilizers, sewage/sludge fertilizers, etc., to achieve the effects of reducing pollution, enhancing activity, and enriching nutrients

Active Publication Date: 2017-01-04
GUANGZHOU HUAKE ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the composting of waste is increasingly favored by people, and the use of composting products to produce organic fertilizers also has certain economic value, technical issues such as the efficiency of composting and the stability of product quality are still key constraints.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing organic fertilizer by using remaining activated sludge and wood waste, the specific method is as follows:

[0026] (1) Wood waste is crushed into small pieces of 10×10mm, and the wood waste mainly includes forest harvesting or wood processing waste such as external materials, board skins, sawdust, etc.; then hydrolyzed, and the hydrolysis method of the wood waste is acid hydrolysis , co-heating wood waste and sulfuric acid with a concentration of 0.55% at 130°C to complete the hydrolysis of easily hydrolyzed polysaccharides, and then continuously feeding dilute sulfuric acid at 180°C to complete the hydrolysis of difficultly hydrolyzed polysaccharides;

[0027] (2) The remaining activated sludge was inactivated in an autoclave at 121° C. for 30 minutes, centrifuged, and separated from solid and liquid to obtain a solid component, and the water content of the solid component was 5%;

[0028] (3) The wood waste after the hydrolysis is mixed in the c...

Embodiment 2

[0032] A method for preparing organic fertilizer by using remaining activated sludge and wood waste, the specific method is as follows:

[0033] (1) Wood waste is crushed into small pieces of 15×15mm, and the wood waste mainly includes forest harvesting or wood processing waste such as foreign materials, boards, wood chips, etc.; then hydrolyzed, and the hydrolysis method of the wood waste is enzymatic hydrolysis , hydrolyzing wood waste with cellulase at a concentration of 0.055% at a temperature of 30°C;

[0034] (2) The remaining activated sludge is inactivated in an autoclave at 121° C. for 30 minutes, centrifuged, and solid-liquid separated to obtain a solid component, and the water content of the solid component is less than 20%;

[0035] (3) The wood waste after the hydrolysis together with the hydrolyzate and the remaining activated sludge after sterilization are mixed in the conical twin-screw mixer, and the weight percentage of the remaining activated sludge in the m...

Embodiment 3

[0039] A method for preparing organic fertilizer by using remaining activated sludge and wood waste, the specific method is as follows:

[0040] (1) Crush the wood waste into small pieces of 20×20mm. The wood waste mainly includes forest harvesting or wood processing waste such as foreign materials, boards, wood chips, etc.; then hydrolyze, and the hydrolysis method of the wood waste is acid hydrolysis , co-heating wood waste and sulfuric acid with a concentration of 0.6% at 150°C to complete the hydrolysis of easily hydrolyzed polysaccharides, and then continuously feeding dilute sulfuric acid at 190°C to complete the hydrolysis of difficultly hydrolyzed polysaccharides;

[0041] (2) The remaining activated sludge is inactivated in an autoclave at 121° C. for 30 minutes, centrifuged, and solid-liquid separated to obtain a solid component, and the water content of the solid component is less than 20%;

[0042] (3) the wood waste after the hydrolysis together with the hydrolyza...

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PUM

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Abstract

The invention discloses a method for preparing an organic fertilizer from excess activated sludge and wood waste. The method includes the specific steps that the wood waste is smashed and hydrolyzed; the excessive activated sludge is sterilized, centrifuged and subjected to solid-liquid separation to obtain solid components; the hydrolyzed wood waste is mixed with hydrolysate and the obtained solid components, microorganism additive accounting for 0.0003-0.001% of the total weight of the mixture and plant hormones accounting for 0.0006-0.0015% of the total weight of the mixture are added, the mixture is conveyed into a high-temperature aerobic composting system for composting, the composting temperature is kept to be 48-53% during composting, air humidity is 68-72%, and composting lasts for 12-20 days. The microorganism additives, the plant hormones and raising agent are added in the composting process, so the oxygen content in compost can be adjusted, activity of the compost is enhanced, people do not need to use a lot of conditioners, cost is reduced, composting efficiency is improved, quality of compost products is improved, environment pollution is reduced, and the excess activated sludge and waste wood are effectively recycled so as to meet the requirement for recycling.

Description

technical field [0001] The invention relates to the technical field of excess activated sludge treatment, in particular to a method for preparing organic fertilizer by utilizing excess activated sludge and wood waste. Background technique [0002] In recent years, with the rapid development of my country's economy and the continuous strengthening of the country's environmental pollution control, the efficiency of my country's sewage treatment has been gradually improved. At the same time, a large amount of surplus sludge is generated in the process of sewage treatment to be treated. The residual sludge of urban sewage treatment plants is rich in organic matter, nitrogen, phosphorus and other nutrients, and has considerable fertilizer effects. Aerobic composting of excess sludge is one of the most common ways in sludge treatment. Aerobic composting is a process in which organic matter is continuously decomposed and transformed under oxygen conditions with the help of aerobic...

Claims

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Application Information

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IPC IPC(8): C05G3/06C05F17/00C05G3/70
CPCC05B7/00C05F17/00C05G3/70C05C9/00C05C11/00C05D1/02C05F5/00C05F7/00C05F11/00C05F11/02C05F11/08C05F11/10Y02W30/40
Inventor 庞志华魏东洋骆其金黎京士赖后伟梁文钟周伟坚
Owner GUANGZHOU HUAKE ENVIRONMENTAL PROTECTION ENG