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Surplus sludge dewatering method for aerobic granular sludge reactor

An aerobic granular sludge and excess sludge technology, applied in dehydration/drying/concentrated sludge treatment, etc., can solve the problems of poor sludge dehydration effect, small volume of supernatant, large dosage of CPAM, etc., to achieve Improve the flocculation effect, increase the degree of dehydration, and reduce the cost

Active Publication Date: 2014-11-05
大连迈克环境科技工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems of poor sludge dehydration effect, large dosage of CPAM, and small volume of supernatant after settling for 1 hour in the existing dewatering method of remaining aerobic granular sludge, thereby providing a method for good Method for dewatering excess sludge in oxygen granular sludge reactor

Method used

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Examples

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Effect test

specific Embodiment approach 1

[0017] Embodiment 1: A method for dehydrating excess sludge in an aerobic granular sludge reactor according to this embodiment is carried out in the following steps:

[0018] 1. Take 1-2L of the remaining elutriation sludge from the aerobic granular sludge reactor with a water content of 97.8%. After concentrating for 1-4 hours, remove the supernatant, and add 80-150 mg of polychlorinated chloride to the sludge. Aluminum (PAC), stirring and reacting for 1 to 2 minutes, continue to add 15 to 25 mg of flocculant cationic polyacrylamide (CPAM) solution with a concentration of 0.05%, and stirring and reacting for 1 to 2 minutes;

[0019] 2. Pass the fly ash through a 200-mesh sieve, soak it in sulfuric acid with a molar concentration of 1-5mol / L, stir it with a magnetic stirrer at a speed of 30-50r / min for 1-2 hours, and then put it in a temperature of 100-120°C drying in an oven for 2 to 4 hours to prepare sulfuric acid modified fly ash; wherein the mass volume ratio of fly ash a...

specific Embodiment approach 2

[0027] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, concentrate for 1 hour. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, stir at a speed of 30 r / min for 2 hours. Others are the same as in the first or second embodiment.

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Abstract

A surplus sludge dewatering method for an aerobic granular sludge reactor relates to a surplus sludge dewatering method. The method provided by the invention is to solve the technical problems in the existing surplus sludge dewatering method that the sludge dewatering effect is poor, the amount of CPAM (cationic polyacrylamide) is large, and the volume of supernatant is few after sedimentation for one hour. The method provided by the invention is as follows: 1, the surplus elutriated sludge in the aerobic granular sludge reactor is concentrated to remove the supernatant, and then aluminium polychlorid and cationic polyacrylamide solution are added; 2, the sulfuric acid modified fly ash is prepared; 3, the sulfuric acid modified fly ash and CaO are fed into the treated sludge to get the well-conditioned sludge; 4, the well-conditioned sludge is sucked into a plate-and-frame filter press to conduct mechanical dewatering after standing, and then the pressure is released to discharge so as to finish dewatering the surplus sludge. The moisture content of the dewatered sludge is less than 60%, and the volume of the supernatant is up to 25% to 35% after sediment after sludge conditioning. The surplus sludge dewatering method is applied to the field of treatment of surplus sludge.

Description

technical field [0001] The invention relates to a method for dewatering excess sludge. Background technique [0002] With the acceleration of my country's urbanization process, the construction of a large number of urban sewage plants has led to a large increase in the amount of residual sludge in sewage plants. At present, thousands of sewage treatment plants have been built in my country, and each sewage treatment plant must discharge a water content of about 99.2% every day. The remaining sludge amounts to hundreds or even tens of thousands of tons, and the annual sludge output exceeds 30 million tons. Due to the common phenomenon of "heavy water and light mud" in my country's sewage treatment plants, most of the sludge has not been properly treated, and the sludge produced Although the amount of sewage only accounts for 1% to 2% of the total amount of sewage treatment, it contains 50% to 80% of the pollutant content, which has brought huge hidden dangers to the ecological ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14
Inventor 李欣詹技灵佟超
Owner 大连迈克环境科技工程有限公司
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