Sewage treatment device and method for synchronously recycling water and electric energy

A sewage treatment device and sewage treatment technology, applied in the direction of water/sewage treatment, water/sewage multi-stage treatment, biological water/sewage treatment, etc., can solve complex, pollutant enrichment treatment and other problems, and achieve treatment economy, energy Take advantage of the full effect

Active Publication Date: 2019-09-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] When the existing PRO is running, it is actually a concentration process for the feed liquid, that is, water passes through the FO membrane into the draw liquid and the pollutants are trapped on the side of the feed liquid, which leads to the presence of carbon and nitrogen in the feed liquid. The enrichment of pollutants such as phosphorus and phosphorus and the complex problems of follow-up treatment

Method used

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  • Sewage treatment device and method for synchronously recycling water and electric energy

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Embodiment 1

[0036] combine figure 1, specifically introduce a sewage treatment device for synchronously recovering water and electric energy of the present invention. The device of the present invention includes a water inlet tank 1, a bioreactor 3, a FO membrane module 6, a turbine 7, a draw liquid pool 9 and a draw liquid recovery system . The water inlet tank 1 is connected with the bioreactor 3 through a peristaltic pump 2, and the FO membrane assembly 6 includes a draw liquid channel, a feed liquid channel, a gasket and an FO membrane, and the gasket and the FO membrane are placed in parallel and the two connect the draw liquid channel and the feed liquid. The feed liquid channel is separated, the inlet of the feed liquid channel and the outlet of the feed liquid channel are connected to the bioreactor 3, the draw liquid pool 9 is connected to the inlet of the draw liquid channel through the high pressure pump 8, and the outlet of the draw liquid channel is passed through the turbine...

Embodiment 2

[0041] use figure 1 The shown unit treats municipal sewage.

[0042] In view of the structure of FO (one layer is an active layer for interception, and one layer is a support layer for support. The active layer is relatively thin and dense, and has strong anti-pollution ability, while the support layer is thick and porous, which is easy to produce Membrane fouling), and in the present invention, the FO membrane faces the activated sludge containing various pollutants. In order to slow down the FO membrane fouling, the OMBR of the present embodiment adopts AL-FS orientation (active layer faces the feed liquid) during operation.

[0043] The influent is urban sewage, water quality: COD: 350±12.2mg / L, NH 4 + -N: 24.88±1.50 mg / L, TN: 38.24±1.68 mg / L, TP: 2.08±0.13 mg / L. Activated sludge with SS (suspended solids) of 3g / L in the bioreactor, the draw liquid is 2M NaCl, the pressure applied on the draw liquid side is 6bar, and the membrane orientation is AL-FS (active layer faces ...

Embodiment 3

[0047] In order to further increase the average electricity generation power, the inventors tried to use an unconventional FO membrane orientation, ie, AL-DS (active layer oriented to the draw solution), for experiments.

[0048] In the method of this embodiment, the influent is urban sewage, water quality: COD: 350±12.2mg / L, NH 4 + -N: 24.88±1.50 mg / L, TN: 38.24±1.68 mg / L, TP: 2.08±0.13 mg / L. In the bioreactor, the SS is 3g / L activated sludge, the draw liquid is 2M NaCl, the pressure applied on the draw liquid side is 6bar, and the membrane orientation is AL-DS (the active layer faces the draw liquid), and it runs for 4h.

[0049] Effluent water quality: COD: 10±1.51mg / L, NH 4 + -N: 5.12±0.90 mg / L, TN: 5.53±1.21 mg / L, TP: 0. The average water flux is 12.19LML, and the average electricity generation power density is 2.2W / m 2 .

[0050] It can be found that when the active layer faces the draw liquid (the membrane faces AL-DS), the average water flux under the same condit...

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Abstract

The invention discloses a sewage treatment device and method for synchronously recycling water and electric energy, and belongs to the field of sewage treatment. The method comprises the following steps that with urban sewage as inflow water, a mud-water mixed liquid is taken as a feed solution and enters a feed solution passage of a membrane assembly through a peristaltic pump, and brine is taken as a draw solution and enters a draw solution passage of the membrane assembly through a high-pressure pump. By utilizing the osmotic pressure difference of the two sides of an FO membrane, water flows from the feed solution side to the draw solution side, the mixed draw solution has high pressure and pushes a turbine to rotate in the outflowing process, and therefore the electric energy is generated. The diluted draw solution passes through a draw solution recycling system to obtain recycled water, and meanwhile, the concentrated draw solution continues to be used for the FO membrane. The sewage treatment device and method for synchronously recycling the water and electric energy are scientific and reasonable in technical design and have important significance for expanding the application of the forward osmosis membrane in sewage treatment.

Description

technical field [0001] The invention relates to a sewage treatment device and method for synchronously recovering water and electric energy, belonging to the field of sewage treatment. Background technique [0002] Membrane bioreactors (MBRs), as a new type of sewage treatment technology combining biological treatment and membrane separation technology, have the advantages of good and stable effluent quality, small footprint, and low residual sludge production. They are widely used in urban sewage and industrial wastewater. It has been widely used in the field of water treatment and is known as one of the most promising water treatment technologies in the 21st century. However, MBR still has problems such as effluent water quality to be further improved, high energy consumption, and serious membrane fouling. [0003] Forward osmosis membrane bioreactor (OMBR) is a new MBR replacement process proposed by foreign scholars in 2008. It uses a new type of forward osmosis (FO) m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/441C02F1/445C02F3/1268C02F9/00
Inventor 王新华孟曼丽刘舒悦任月萍李秀芬
Owner JIANGNAN UNIV
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