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Combined cas‑mbr sewage treatment system

A sewage treatment system and composite technology, applied in the field of composite CAS-MBR sewage treatment system, to achieve the effect of reducing the amount of excess sludge, high activity and preventing sludge expansion

Active Publication Date: 2017-03-29
BEIJING ORIGINWATER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process should be able to run stably. However, due to the intermittent cycle operation mode, the system can only be used for sewage treatment with small water volume and low load.

Method used

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  • Combined cas‑mbr sewage treatment system
  • Combined cas‑mbr sewage treatment system
  • Combined cas‑mbr sewage treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The first phase process of a sewage treatment plant in the north is the traditional "AAO + secondary sedimentation tank", and the effluent water quality is in accordance with the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) Class A A implementation. After passing through the pretreatment system (including coarse screen, fine screen and primary sedimentation tank), the sewage enters the combined biochemical tank (anaerobic tank-anoxic tank-aerobic tank), and finally passes through the secondary sedimentation tank. The treatment scale of the system is 100,000 m 3 / d.

[0053] A new MBR process was built in the second phase of the sewage treatment plant, with a treatment scale of 200,000 m 3 / d, realize expansion, and upgrade the first-phase process. like figure 2 As shown, the first sub-system is the second-phase project, and the second sub-system is the original first-phase project; an MBR pool is installed downstream of the combin...

Embodiment 2

[0069] The main process of the first phase of a sewage treatment plant in central China is the traditional "AO + secondary sedimentation tank", and the effluent water quality is in accordance with the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) Grade B. After passing through the pretreatment system (including coarse screen, fine screen and aerated grit chamber), the sewage enters the combined biochemical tank (anaerobic tank-aerobic tank), and finally passes through the secondary sedimentation tank. The system has a treatment scale of 55,000 m 3 / d.

[0070] A new MBR process was built in the second phase of the sewage treatment plant, with a treatment scale of 110,000 m 3 / d, realize expansion, and upgrade the first-phase process. like image 3As shown, the first sub-system is the second-phase project, and the second sub-system is the original first-phase project; an MBR pool is installed downstream of the combined biochemical pool of t...

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Abstract

The invention relates to a composite CAS (conventional activated sludge process)-MBR (membrane bioreactor) sewage treatment system. The sewage treatment system comprises two parallel paths of sub-systems, wherein the first path of sub-system comprises a first combined biochemical pool and an MBR; the second path of sub-system comprises a second combined biochemical pool and a secondary sedimentation tank; to-be-treated sewage enters the two paths of sub-systems; effluent of the MBR is combined with that of the secondary sedimentation tank to obtain the effluent of the composite CAS-MBR sewage treatment system; and complete or partial residual sludge generated by the MBR is conveyed into the second combined biochemical pool, and is mixed and domesticated with CAS sludge in the second combined biochemical pool, so as to form mixed active sludge. Compared with a single CAS system, the effluent quality of the composite system can be improved by two grades, and can be improved by one grade in comparison with the quality of parallel mixed effluent of the CAS and the MBR; the composite CAS-MBR sewage treatment system is small in floor area, low in energy consumption, and impact resistant; the residual sludge amount can be effectively reduced; the sludge treatment cost is reduced; and the system provided by the invention is also named a safe-MBR.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of sewage treatment, in particular to a composite CAS-MBR sewage treatment system. [0003] 【Background technique】 [0004] Membrane Bioreactor (MBR) is a relatively advanced sewage treatment technology. MBR is a kind of sewage treatment and organic combination of high-efficiency solid-liquid separation of membrane modules and microbial degradation in bioreactors. Reuse technology, which replaces the secondary settling tank and post-treatment system in the traditional treatment process with membrane modules, simplifying the process flow. It can effectively separate solids and liquids, and the high-efficiency interception of the membrane module avoids the loss of microorganisms, and can also effectively intercept nitrifying bacteria, all bacteria and suspended solids, etc., and the effluent water quality of MBR is good. In addition, MBR has high pollutant treatment load, nitrification load, and denitrification...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 张悦俞开昌薛涛车淑娟张朋川吴媛媛贾海涛陈翔赵军文剑平何愿平戴日成
Owner BEIJING ORIGINWATER TECH CO LTD
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