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AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal

A sewage treatment method and biological phosphorus removal technology are applied in the field of environmental engineering to achieve the effects of reasonable structural design, good application prospects, and low cost of device construction and operation and maintenance.

Active Publication Date: 2021-07-13
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the AAO and other processes used in rural domestic sewage treatment projects have ignored this problem, making the treatment equipment unable to exert its optimal efficiency according to the requirements of the discharge standard.

Method used

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  • AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal
  • AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal
  • AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal

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Embodiment

[0033] GPS-X 6.4 activated sludge commercial software was used to simulate and compare the AAO enhanced phosphorus removal process of the present invention with common AAO process, UCT process, MUCT process and inverted AAO process. The amount of sewage treated by each comparison process is designed to be 10,000m 3 / d, the design sludge age is SRT=10d, 15d and 20d respectively, and the design influent water quality is according to BOD 5 / TN is designed with three carbon-nitrogen ratios of low, medium and high, as shown in Table 1; the design effective volume and hydraulic retention time of anaerobic tank, anoxic tank, aerobic tank and sedimentation tank are shown in Table 2 and Table 3; Simulation results such as Figure 2a ~ Figure 2l shown.

[0034] Table 1 Influent water quality of each comparative process design

[0035] main indicators COD SS BOD 5

NH 3 -N

TN TP pH BOD 5 / TN

BOD 5 / COD

unit mg / L mg / L mg / L mg / L ...

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Abstract

The invention discloses an AAO continuous flow activated sludge sewage treatment method and device for enhancing biological phosphorus removal, and belongs to the technical field of environmental engineering. Pretreated sewage is treated by an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank in sequence, and then effluent enters a subsequent treatment unit; one part of sludge in the sedimentation tank is discharged to a sludge treatment unit, and the other part flows back to the front end of the anoxic tank; and a part of anoxic tank mixed liquid at the tail end of the anoxic tank flows back to the front end of the anaerobic tank. The method is essentially characterized in that only nitrate nitrogen in sludge which is about to flow back to the anaerobic tank is removed in the anoxic tank through denitrification, so that the interference of the nitrate nitrogen on anaerobic phosphorus release of phosphorus-accumulating bacteria in the anaerobic tank is eliminated. When being used for treating sewage with a low carbon-nitrogen ratio, the device has good phosphorus removal capacity, the phosphorus removal capacity is superior to that of common sewage treatment processes such as an AAO process, a UCT process and an MUCT process, and a better way is provided for decentralized sewage treatment, particularly rural domestic sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to an AAO continuous flow activated sludge sewage treatment method and device for enhanced biological phosphorus removal. Background technique [0002] In small-scale sewage treatment projects such as residential sewage and rural domestic sewage, the discharge standards implemented by sewage treatment facilities are relatively loose compared with the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" implemented by urban sewage treatment plants. . Taking the water pollutant discharge standard issued by a certain place as an example, the standard is applicable to the design scale of 50 cubic meters per day (including 50 cubic meters per day) to 500 cubic meters per day (including 500 cubic meters per day) and located in urban built-up areas Water pollutant discharge management of rural domestic sewage treatment facilities in other areas. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/302C02F2301/043C02F2001/007Y02W10/10
Inventor 赵剑强雷抒涵赵浚凯杨文娟胡博李晓玲张局
Owner CHANGAN UNIV
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