Method for preparing sludge organic fertilizer from high moisture percentage sludge

A high water content, organic fertilizer technology, applied in the preparation of organic fertilizers, sewage/sludge fertilizers, organic fertilizers, etc. The effect of mud composting process, long-lasting efficacy and low preparation cost

Inactive Publication Date: 2008-03-19
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are still some problems to be solved in sludge composting, mainly including: (1) the moisture content of sludge is too high, and the moisture content of sludge after dehydration treatment generally still reaches 82%, and the sludge aerobic composting process is suitable The moisture content is 50-65%. Before composting, the sludge needs to be pretreated by drying and adding a large amount of conditioner, which brings difficulties to practical engineering applications and increases the cost of sludge composting; (2) the composting process has nitrogen, The loss of phosphorus and other nutrients, especially nitrogen, is lost in a large amount in the form of N volatilization and filtrate loss; (3) There is a certain amount of heavy metal pollution in the sludge, which is one of the key factors restricting the land use of sludge composting

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  • Method for preparing sludge organic fertilizer from high moisture percentage sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The special fermentation tank is composed of an air inlet and outlet control system, a stirring system, a fermentation tank system, and a heating and temperature control system. In the fermentation tank system, the inner tank is cylindrical with a radius of 500mm and a height of about 1700mm, and is made of steel plates with a thickness of 3mm; the outer tank has a radius of 600mm and is formed by stacking; The top is 400mm, and the compost discharge is 50mm away from the bottom of the inner tank. The air supply volume of the blower is controlled within the range of 30L / min. The motor is powered by a three-phase power supply. The total power of the electric furnace wire is 2000W, and the temperature of the heating layer is controlled at 45°C.

[0022] Take 500kg of sludge with an initial moisture content of 82.15%, add 2.5kg of sodium polyacrylate and 30kg of sawdust, pour it into the feed □, let it stand for 20 minutes, naturally discharge 70kg of sewage, start the mot...

Embodiment 2

[0024] Special fermentor is identical with embodiment 1. The air supply volume of the blower is controlled within the range of 50L / min. The motor is powered by a three-phase power supply. The total power of the electric furnace wire is 2000W, and the temperature of the heating layer is controlled at 45°C.

[0025] Take 500kg of sludge with an initial moisture content of 78.15%, add 5kg of potassium polyacrylate and 50kg of sawdust, pour it into the feed □, let it stand for 20 minutes, discharge 65kg of sewage, start the motor, stir for 20 minutes, and let it stand During the fermentation, start the vacuum pump and blower once every 12 hours, and blow and pump air for 10 minutes each time; start the motor once every 24 hours for stirring, and stir for 10 minutes each time. After 28 days, the composting is over, and the compost tank is opened. Material □, out of the bag.

Embodiment 3

[0027] Special fermentor is identical with embodiment 1. The air supply volume of the blower is controlled within the range of 15L / min. The motor is powered by a three-phase power supply. The total power of the electric furnace wire is 2000W, and the temperature of the heating layer is controlled at 35°C.

[0028]Take 500 kg of sludge with an initial moisture content of 88.35%, add 12.5 kg of potassium polyacrylate and 15 kg of bagasse, pour it into the feed, let it stand for 20 minutes, and naturally discharge 70 kg of sewage, start the motor, and stir for 20 minutes. Stand for fermentation, start the vacuum exhauster and blower once every 12 hours, and blow and pump air for 10 minutes each time; start the motor once every 24 hours to stir, and stir for 10 minutes each time. After 30 days, the composting is over and the composting is turned on Tank discharge □, discharge into bags.

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Abstract

The invention relates to a method of preparing organic sludge manure, which utilizes hight water-absorption resin to improve the sludge performance and increase the composting of sludge with high water content. High water-absorption resin conditioner accounting for one to two point five percent of the weight of the sludge and carbonaceous conditioner accounting for three to ten percent of the weight of the sludge are added into the sludge with high water content, which is discharged by the sewage treatment plants of a city, and the sludge is dumped into a dedicated fermentor, and after being uniformly mixed, undergoes composting fermentation. In the course of fermentation, the fermentation temperature is controlled in a range of thirty five to sixty five DEG C, the sludge is intervalically stired and ventilated, the composting lasts twenty to thirty two days, and therefore an organic sludge manure product is prepared. The invention introduces the high water-absorption resin as the sludge compost conditioner for the first time, and the added high water-absorption resin realizes the aerobic compost of the sludge with high water content and promotes the process of sludge composting. Meanwhile, the traditional desiccation process of sludge compost is left out, as a result, the process is simplified, the preparation cost is low, and the content of organic matters and nitrogen is high.

Description

technical field [0001] The invention relates to a sludge composting technology, in particular to a method for preparing sludge organic fertilizer by using a superabsorbent resin to improve sludge performance and high water content sludge composting. Background technique: [0002] Sludge is a black or dark brown fluid substance with a high water content (the water content of liquid sludge can reach 99%). A collection of things. Sludge mainly comes from municipal sludge (Civil sludge, also called sewage sludge Sewage sludge), pipe network sludge, river and lake sludge, industrial sludge, especially municipal sludge. With the rapid development of urbanization, urban sewage With the improvement of the treatment system, municipal sludge has become the largest type of sludge, and it has become a key factor affecting the normal operation of municipal construction and urban sewage treatment systems. Sludge not only has a high water content, is perishable, and has a strong odor, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/00C05F17/00
CPCY02A40/20Y02W30/40
Inventor 陈庆华肖荔人卢巧晖胡海滨刘欣萍
Owner FUJIAN NORMAL UNIV
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