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Control system for wastewater treatment plants with membrane bioreactors

By using a microprocessor control system in the MBR system to automatically adjust the operation of pumps and valves based on parameters such as oxygen uptake rate and membrane conductivity, the problem of flow and pressure control of the MBR system in sewage treatment is solved, and energy consumption and operating costs and improved system performance.

Inactive Publication Date: 2014-03-05
PRAXAIR TECH INC
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AI Technical Summary

Problems solved by technology

[0006] Although this prior art control system is effective in controlling the cleaning process of the membrane, it rarely controls or optimizes the flow within the MBR system or the overall wastewater treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Sewage treatment plant parameters and measurement technology

[0015] go to figure 1 , showing a high-level schematic of a biological system within a wastewater treatment plant with an external membrane bioreactor (eMBR) system. figure 1 Shown is a simplified diagram of an active sewage process that employs a balance tank 20 that supplies wastewater to an aeration or biological tank 30, high-purity oxygen (HPO) or air injection into the aeration tank. Aeration system 33 , and membrane bioreactor (MBR) system 40 including a plurality of membrane modules 42 , MBR pump 44 , MBR suction pipe 46 and circulation pipe 48 . The illustrated system includes an inflow stream 32 that is directed to the balance tank 20 and then to the biological pond 30 . A portion of the wastewater in biopond 30 is diverted into MBR stream 45 via MBR pump 44 to membrane module 42 . The effluent stream 49 exiting the MBR system 40 is recycled back to the biopond 30, while the permeate strea...

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Abstract

An advanced control system for a membrane bioreactor based wastewater treatment plant is disclosed. The disclosed control system comprises a membrane bioreactor (MBR) system and a microprocessor based controller that receives signals corresponding to selected measured MBR parameters and calculates or estimates one or more MBR calculated parameters including Membrane Conductivity (Fxc); and / or Oxygen Uptake Rate (OUR). The microprocessor based controller compares one or more calculated or estimated MBR parameters to prescribed setpoints or desired ranges and governs one or more pumps and valves in the MBR system to adjust the cleaning cycle in the MBR system, the MBR flows in the MBR system, or the influent flow to the biological basin in response thereto.

Description

technical field [0001] The present invention relates to control strategies for wastewater treatment plants with membrane bioreactor (MBR) systems, and more particularly, to advanced wastewater treatment control strategies for MBR systems in wastewater treatment plants using oxygen uptake rates, Membrane conductivity or other calculated MBR parameters to control the operation of the MBR system. Background technique [0002] Membrane bioreactors combine membrane filtration technology for wastewater treatment and biodegradation of active foulants. In a typical membrane bioreactor system, submerged membranes or external membranes are used to filter the active foulant stream from the bioreactor to produce a high quality effluent, as generally described, for example, in US Pat. Nos. 7,879,229 and 8,114,293 . [0003] MBR systems used in sewage treatment systems are typically designed or sized to deliver the intended permeate output or effluent. In a submerged membrane bioreacto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/12
CPCC02F2209/22C02F3/006C02F2209/003C02F3/1273C02F2303/20C02F2209/001C02F3/1268C02F2209/006C02F2209/03C02F2303/10C02F2209/40C02F2209/02Y02W10/10Y02W10/30C02F2303/16
Owner PRAXAIR TECH INC
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