Pre-treatment method for deep sludge dewatering

A deep dehydration and pretreatment technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of increasing washing waste liquid, high temperature of pyrolysis, high operating cost, etc., to achieve improved treatment efficiency, good safety and Adsorption performance, energy saving effect

Active Publication Date: 2015-07-15
GUANGDONG PROVINCIAL ACADEMY OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the sludge is directly dried and dehydrated, which also has the disadvantages of large heat consumption and high operating costs. In addition, the dried sludge is re-soaked in ZnCl 2 In the solution, on the one hand, it will reabsorb water, so that this part of water will be evaporated in the subsequent process, increasing energy consumption; on the other hand, soaking in ZnCl 2 In aqueous solution, ZnCl 2 Excessive adhesion on the surface of the sludge, the activation effect is poor, and washing is required in the subsequent steps, which increases the washing waste liquid and causes high pyrolysis temperature

Method used

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  • Pre-treatment method for deep sludge dewatering

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Effect test

Embodiment 1

[0053] When the sludge is treated by the present invention, 6 kg of sodium hypochlorite and 30 L of concentrated sulfuric acid are first added to 2000 L of domestic sludge with a water content of 96%, and FeSO is added after stirring for 60 minutes. 4 20kg, ZnCl 2 30kg and stir for 3min, finally add 8kg of octadecyltrimethylammonium chloride and stir for 3min, then use a diaphragm plate and frame filter press to feed the mud for 120min under a pressure of 0.8MPa, and then use a hydraulic pressure to press the diaphragm for 20min under a pressure of 0.8MPa , The mud cake was weighed and the moisture content of the sludge was determined to be 59%.

Embodiment 2

[0055] When the sludge is treated by the present invention, 10 kg of sodium hypochlorite and 40 L of concentrated sulfuric acid are first added to 2000 L of domestic sludge with a moisture content of 96%, and FeSO is added after stirring for 80 minutes. 4 20kg, ZnCl 2 Stir 30kg for 4min, finally add 8kg of octadecyltrimethylammonium chloride and stir for 4min, use a diaphragm plate and frame filter press to feed the mud for 120min under a pressure of 0.8MPa, and then press the diaphragm for 20min under a pressure of 0.8MPa by hydraulic pressure , The mud cake was weighed and the moisture content of the sludge was determined to be 56%.

Embodiment 3

[0057] When the sludge is treated by the present invention, 6 kg of sodium hypochlorite and 30 L of concentrated sulfuric acid are first added to 2000 L of domestic sludge with a water content of 96%, and FeSO is added after stirring for 60 minutes. 4 30kg, ZnCl 2 40kg and stir for 4min, finally add 8kg of octadecyltrimethylammonium chloride and stir for 4min, use a diaphragm plate and frame filter press to feed the mud for 120min under a pressure of 0.8MPa, and then use a hydraulic pressure to press the diaphragm for 20min under a pressure of 0.8MPa , The mud cake was weighed and the moisture content of the sludge was determined to be 58%.

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Abstract

This invention relates to a pre-treatment method for deep sludge dewatering. The method specifically comprises: adopting steps of membrane breaking, coagulation and modification to pre-treat sludge so as to improve a pressure filtration dewatering effect of the follow-up frame, reduce a pyrolysis temperature of the follow-up sludge, improve sludge pyrolysis product performances, overcome disadvantages of high energy consumption and low efficiency in the traditional process, obtain biological carbon products with characteristics of excellent product performance and high environment safety, and achieve sludge reduction, sludge harmlessness and sludge resource treatment.

Description

technical field [0001] The invention relates to a pretreatment method for deep dehydration of sludge, in particular to the pretreatment of sludge by using the steps of membrane breaking, coagulation, modification and coagulation. Industrial sludge produced in industries such as textiles, papermaking, etc. is especially suitable for the pretreatment step of the method of preparing biochar by using sludge pyrolysis. Background technique [0002] Sludge is a by-product of domestic sewage and industrial wastewater treatment. With the rapid development of my country's economy and the expansion of the production scale of industrial enterprises, the sludge output is increasing year by year. Due to the lag of sludge treatment technology, many sewage treatment plants and enterprises are faced with the dilemma of being overwhelmed with "mud" and having no way out. In recent years, serious environmental pollution incidents caused by random dumping of sludge have been frequently repor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14
Inventor 黄志华卢欢亮汪永红叶向东李朝晖曾祥专郑进熙
Owner GUANGDONG PROVINCIAL ACADEMY OF ENVIRONMENTAL SCI
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