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Novel municipal sewage treatment technology without excess sludge discharge

A technology for urban sewage and excess sludge, applied in water/sludge/sewage treatment, water/sewage multi-stage treatment, flotation water/sewage treatment, etc., to improve effluent water quality, eliminate odor, and reduce aeration volume effect

Inactive Publication Date: 2009-05-13
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a new technology for sewage treatment and reuse without excess sludge discharge in the treatment system, so as to solve the problem of excess sludge generated in the process of urban sewage treatment and realize zero sludge discharge

Method used

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  • Novel municipal sewage treatment technology without excess sludge discharge
  • Novel municipal sewage treatment technology without excess sludge discharge
  • Novel municipal sewage treatment technology without excess sludge discharge

Examples

Experimental program
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Effect test

Embodiment 1

[0014] The water quality characteristics of sewage from a certain urban sewage plant are shown in Table 1. figure 1 Process flow for processing. The HRT in the conditioning tank is 8h; the hypoxic tank is 4h; the HRT of the first-level micro-oxygen tank is 6h, and the DO is 0.3~1mg / L; the HRT of the second-level micro-oxygen tank is 6h, and the DO is 0.8~1.5mg / L; The HRT of the oxygen tank is 4h, and the DO is 1.5~2.0mg / L; the HRT of the secondary aerobic tank is 4h, and the DO is 2~4mg / L; the coagulant is PAC, and the treatment is normally operated under the conditions of 8~15mg / L. , The final effluent is superior to the standards and requirements of domestic miscellaneous water after being filtered by quartz sand, activated carbon and UV sterilization. The treatment results are shown in Table 1. In addition, there is no H during processing 2 When odors such as S appear, the processing system saves energy consumption by about 30% compared with conventional processes. The sludge o...

Embodiment 2

[0018] The water quality characteristics of sewage from a certain living quarter are shown in Table 2. figure 1 Process flow for processing. The HRT in the conditioning tank is 8h; the hypoxic tank is 4h; the HRT of the first-level micro-oxygen tank is 6h, and the DO is 0.3~1mg / L; the HRT of the second-level micro-oxygen tank is 6h, and the DO is 0.8~1.5mg / L; The HRT of the oxygen tank is 4h, and the DO is 1.5~2.0mg / L; the HRT of the secondary aerobic tank is 4h, and the DO is 2~4mg / L; the coagulant is PAC, and the treatment is normally operated under the conditions of 8~15mg / L. , The final effluent is superior to the standards and requirements of domestic miscellaneous water after being filtered by quartz sand, activated carbon and UV sterilization. The treatment results are shown in Table 1. In addition, there is no H during processing 2 When odors such as S appear, the processing system saves 30% of energy consumption compared with conventional processes. The sludge of the trea...

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Abstract

The invention provides a process system for no residual sludge emission in the treatment of municipal sewage, which belongs to a sewage treatment process. The process flow is as follows: the municipal sewage in an adjusting tank orderly is subjected to anoxic biological treatment, microaerophilic biological treatment and aerobic biological treatment, and then orderly undergoes coagulation air-flotation treatment, quartz sand treatment, biological active carbon filtration and subsequent UV sterilization disinfection treatment, and reused as non-potable household water. The process has the advantages of eliminating the odor pollution such as H2S generated in the anaerobic hydrolysis process by the prior A / O method, reducing aeration amount, saving energy consumption, lowering sewage treatment cost, recycling sewage, not causing secondary pollution, completely refluxing the treated system sludge to the anoxic tank, performing the sludge treatment and the sewage biological treatment in the same system, conveniently operating and managing, realizing the residual sludge emission of the system, and improving the discharged water quality of the original treatment system.

Description

Technical field [0001] The invention relates to an odorless energy-saving micro-oxygen biological treatment combined process system for urban sewage treatment without surplus sludge discharge and reuse, which belongs to a sewage treatment process. Background technique [0002] Activated sludge method is currently the most widely used biological treatment technology for urban sewage treatment in the world, and this method produces a large amount of excess sludge. However, there are various disadvantages in the disposal of surplus sludge, therefore, sludge reduction technology has attracted people's attention. At present, the surplus sludge is generally cracked by physical, chemical, and biological methods and then returned to the aeration tank and other biological oxidation systems to be degraded by microorganisms, so that the amount of surplus sludge discharged from the entire sewage treatment system can be minimized or even reached. Zero discharge, solve the output of sludge fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/24C02F1/32
Inventor 肖羽堂
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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