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Device for concentrating and digesting sludge and generating power synchronously

A technology for digesting sludge and sludge, applied in biological sludge treatment, biochemical fuel cells, etc., can solve problems such as increased costs, complicated treatment process, and water not being effectively recycled, so as to improve power generation performance and economical The effect of reasonable treatment

Active Publication Date: 2015-04-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, researchers gradually found that after MFC treatment, the solid content of the remaining sludge decreased (about 30-40%), but the water in the sludge was not effectively recycled.
At the same time, due to the increase in the water content of the sludge, it must be further dehydrated and concentrated before subsequent treatment, which not only increases the relevant costs, but also complicates the treatment process, which restricts the application and promotion of MFC to treat excess sludge

Method used

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  • Device for concentrating and digesting sludge and generating power synchronously
  • Device for concentrating and digesting sludge and generating power synchronously

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Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: the forward osmosis-microbial fuel cell structure described in the embodiment of the present invention is as figure 1 As shown, it includes a FO membrane 1, an anode chamber 2, a cathode chamber 3, an anode electrode 4, and an air cathode 5. Such as figure 2 As shown, the FO membrane 1 divides the anode chamber 2 and the cathode chamber 3 of the microbial fuel cell. The anode chamber 2 is provided with a mud inlet 2-1 and a vent 2-2, the mud inlet can be arranged on the side wall of the anode chamber 2 near the bottom, the vent can be arranged on the top of the anode chamber 2, and the cathode chamber 3 is provided with a second A water inlet 3-1 and a second water outlet 3-2, the first water inlet 3-1 can be arranged on the side wall of the cathode chamber 3 near the bottom, and the second water outlet 3-2 is arranged on the top of the cathode chamber 3 to ensure the first The water inlet 3-1 and the second water outlet 3-2 are located at the farthest...

Embodiment 2

[0022]Embodiment 2: with the forward osmosis-microbial fuel cell described in embodiment 1, take the sludge of the primary sedimentation tank of a certain urban sewage treatment plant as fuel, its MLSS is 15.4~16.0 g / L, and MLVSS is 10.3~10.71 g / L, TCOD is 11.3~11.4 g / L, SCOD is 10.3~45.7 g / L,; the draw solution is 1.0 mol / L (NH 4 ) 2 HPO 4 solution. After running for 30 days, the output voltage of FO-MFC (load 470 Ω) is 478~498 mV, and the output power is 1.24~1.34 W / m 3 The TCOD, MLSS, and MLVSS digestion rates of digested sludge in the anode chamber were 31.4%, 35.0%, and 56.1%, respectively, and the MLVSS / MLSS value also decreased from 0.67 to 0.43; the diluted draw solution met the agricultural irrigation water standard.

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Abstract

The invention relates to a device for concentrating and digesting sludge and generating power synchronously. The device consists of a forward osmosis (FO)-microbial fuel cell, a sludge conditioning tank, a drawing liquid tank and a circulating pump, wherein the FO-microbial fuel cell consists of an FO membrane, an anode chamber, a cathode chamber, an anode and an air cathode, and the anode chamber and the cathode chamber are separated by the FO membrane. An anolyte is surplus sludge or high-concentration fertilizer drawing liquid; the cathode is the air cathode. Organic matters in the sludge are catalyzed by microorganisms and are finally recovered in the form of electric energy; due to the adoption of the air cathode, the oxygen content of a cathode can be increased without additional power; due to the design of the FO membrane, the power generating performance of the device can be improved, the solid-liquid separation for the surplus sludge can be realized without additionally pressurizing, and thus, the effect of concentrating is achieved; after a catholyte is diluted, the diluted catholyte is directly applied to farmland without pure water separation. The device has the advantages that electric energy is obtained while the surplus sludge is treated in an economical and reasonable manner, and the integration of the concentration, digestion and power generation of the sludge is realized.

Description

technical field [0001] The invention belongs to the field of municipal sludge treatment, and in particular relates to a device combining forward osmosis and microbial fuel cell, which can simultaneously concentrate and digest sludge and generate electricity, in particular to a device for synchronously concentrating and digesting sludge and generating electricity. Background technique [0002] As a by-product of wastewater treatment in urban sewage treatment plants, excess sludge is rich in a large number of potential energy substances and nutrients such as nitrogen and phosphorus, which can be used as a resource. If appropriate technical processes are adopted to effectively recover resources and energy substances in excess sludge, not only can the final treatment and disposal costs of sludge be greatly reduced, but also its negative impact on the environment can be significantly reduced, which will help realize the sewage sludge treatment sustainable development of the indus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02H01M8/16
CPCY02E60/50
Inventor 王志伟唐霁旭黄菲黄健张杰张星冉马金星吴志超
Owner TONGJI UNIV
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