Chemical conditioning method for improving dehydration property of surplus sludge

A technology for excess sludge and dewatering performance, applied in the field of resources and environment, can solve the problems of insufficient carbon source in sewage plants and unsatisfactory sludge dewatering performance

Inactive Publication Date: 2013-04-24
TIANJIN CHENGJIAN UNIV
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Problems solved by technology

[0005] Aiming at the initial characteristics of excess sludge and the unsatisfactory problem of adjusting the sludge dewatering performance by existing methods, the present invention provides a chemical conditioning method for improving the dewatering performance of excess sludge, which can

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  • Chemical conditioning method for improving dehydration property of surplus sludge
  • Chemical conditioning method for improving dehydration property of surplus sludge

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Embodiment Construction

[0017] Take the excess sludge from a sewage treatment plant (using the multi-point water inflow A / O process) and return it to the sludge pump room, put it in the excess sludge hydrolysis acidification device, and control the stirring speed within the range of 70-90r / min (this When the remaining sludge can be stirred evenly but will not generate vortex), use 30% HCl and 20% NaOH solution to adjust the pH value, adjust once every 2h in the initial stage, and adjust once every 12h after stabilization. The sludge was adjusted to be acidic (pH=3.0) in the first 8 days, and the sludge was adjusted to be alkaline (pH=10.0) after sampling on the 8th day, and the reaction was carried out at room temperature for a total of 16 days. Take samples from the upper, middle and lower ports of the reactor, mix them evenly and measure the relevant indicators until the end of the reaction period. The specific resistance coefficient b is measured by the Buchner funnel method, and it is brought int...

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Abstract

The invention relates to a chemical conditioning method for improving dehydration property of surplus sludge, which is characterized by comprising the following steps: putting surplus sludge in an SBR (sequencing batch reactor), stirring with an electric stirrer, carrying out hydrolytic acidification at room temperature in an two-stage control mode (alkali (pH=10.0) after acid (pH=3.0)) (8 days for each stage), and regulating the pH value with 30% HCl and 20% NaOH solution; taking a sample every two days, and storing the sample in a 4 DEG C environment; measuring sludge resistivity by a Buchner funnel method; measuring the solid content in the filter cake with a halogen quick moisture meter; and analyzing the dehydration property of the sludge regulated by acid and alkali according to the measured resistivity and the solid content of the filter cake. The method provided by the invention can improve the dehydration property of the sludge, and promote the release of abundant organic matters in the sludge; and after the sludge is recycled, the problem of insufficient carbon sources for the sewage plant can be solved, thereby lowering the routine operation cost of the sewage plant.

Description

technical field [0001] The invention relates to a chemical conditioning method for improving the dehydration performance of excess sludge in urban sewage treatment plants, and belongs to the technical field of resources and environment. Background technique [0002] With the acceleration of the modernization process and the continuous development of the urban sewage treatment industry, the sludge disposal pressure of urban sewage treatment plants is increasing, and the water content of this part of sludge is as high as 95% to 99.5%. [0003] The primary consideration in sludge treatment is to reduce the volume of sludge, which requires sludge dehydration. Due to the special structure of sludge particles and their high hydrophilicity, sludge particles contain a large amount of interstitial water and surface water, which are difficult to remove. Most of the organic matter in sludge is microbial cell matter, which is absorbed by microbial cell walls. It is difficult to be used...

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Application Information

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IPC IPC(8): C02F11/00C02F11/04
Inventor 苑宏英牛四芳祁丽宋建阳
Owner TIANJIN CHENGJIAN UNIV
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