Treatment method for sludge reduction

A treatment method and sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., to achieve high concentration, increase sludge reduction, and reduce operating time Effect

Inactive Publication Date: 2016-02-03
GUANGZHOU LIBY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems existing

Method used

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  • Treatment method for sludge reduction

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Experimental program
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Effect test

Embodiment 1

[0027] The excess sludge is discharged from the secondary sedimentation tank of a sewage treatment station in a factory, and the sludge concentration is 7-9g / L. The excess sludge enters the sludge concentration tank and stands still for 15 hours for initial concentration. The supernatant is returned to the sewage station for adjustment After the initial thickening, the volume of the sludge is reduced to 35% of the original volume; add polyacrylamide with a sludge volume of 3‰ and 1% hydrogen peroxide to the sludge after the initial concentration, and float for 30 minutes, and muddy water can be observed Stratification is rapid and the interface is clear. After the air flotation is completed, the supernatant is discharged to the regulating tank, and the sludge volume is reduced by about 50%. The sludge after two times of concentration is then reacted through the reaction unit. The control conditions of the reaction are: add Adjust the pH to 5 with sulfuric acid, heat to 90°C wit...

Embodiment 2

[0033]The excess sludge discharged from the secondary sedimentation tank of the sewage treatment station of a daily chemical product production factory has a sludge concentration of 8-10g / L. The excess sludge contains more organic substances and refractory substances. The excess sludge is pumped into the After the sludge concentration tank was left standing for 16 hours, the initial concentration was carried out, and the supernatant was returned to the adjustment tank of the sewage station. After the initial concentration, the sludge volume was reduced to 40%; Acrylamide and ozone were used for air flotation, and the air flotation was carried out for 40 minutes until the stratification was stable. After the air flotation was completed, the volume of the sludge was reduced by about 60%, and the supernatant was discharged to the adjustment tank at the same time; Entering the reaction unit, the control conditions of the reaction are: adding sulfuric acid to adjust the pH to 1, pas...

Embodiment 3

[0039] The secondary sedimentation tank of an urban sewage treatment plant discharges excess sludge with a sludge concentration of 5-9g / L. The excess sludge enters the sludge concentration tank and is left for 15 hours for initial concentration. After the initial concentration, the supernatant is refluxed To the sewage station regulating tank, the sludge volume is reduced to 30%; add 3‰ of the sludge volume of polyacrylamide and 1% hydrogen peroxide to the sludge after the initial concentration, and float for 30 minutes, and the sludge moisture can be observed After the air flotation is completed, the volume of the sludge is reduced by about 50%, and the supernatant is discharged to the adjustment tank; the sludge after twice concentration enters the reaction unit, and the control conditions of the reaction are: adding hydrochloric acid to adjust the pH To 1, heat to 80°C with steam and keep it warm, add sodium hypochlorite with 7% of the sludge mass after the initial concentra...

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Abstract

The invention discloses a treatment method for sludge reduction. The method comprises the steps that residual sludge from a secondary sedimentation tank undergoes standing and gravitational sedimentation first, supernate obtained after sedimentation flows back to a regulating tank to complete initial concentration, then air floatation treatment is conducted on the sludge subjected to initial concentration to complete secondary concentration, supernate obtained after secondary concentration flows back to the regulating tank, the pH of the sludge after secondary concentration is regulated, a strong oxidizer is added after steam heating, the purposes of improving the concentration degree and dehydration performance and remarkably decreasing the amount are achieved after oxidation of the strong oxidizer, the reaction unit is completed after reaction is performed for a certain time, and then the final sludge-water mixture is delivered to a sludge dehydrator to be dehydrated, wherein the filtrate flows back to the regulating tank, and dry sludge is transported to the outside for disposal. By means of the method, the sludge concentration degree can be effectively improved, the sludge dehydrating performance can be improved, sludge can be remarkably decreased, and the energy consumption and operation cost are reduced. The treatment method has good development prospect.

Description

technical field [0001] The present invention relates to a sludge reduction treatment method, specifically, to a method for treating excess sludge by using gravity, air flotation and oxidation to improve dewatering performance and reduce the amount of sludge. This technology can be widely used It is used in the sludge treatment process of the sewage treatment industry. Background technique [0002] At present, activated sludge treatment of domestic and production sewage is still a widely used sewage treatment method in the world. In the process of sewage treatment by activated sludge method, microorganisms use carbon-containing organic matter and nitrogen and phosphorus in sewage to grow and reproduce to achieve purification. The purpose of sewage, with the continuous increase and accumulation of microbial biomass, in order to maintain the effect of biological treatment unit, it is necessary to discharge excessive excess sludge. This part of the remaining sludge has a high m...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/12C02F11/14
Inventor 肖磊唐剑文何宜斌
Owner GUANGZHOU LIBY
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