Device and method for recycling nitrogen and phosphorus in excess sludge through electrochemical sedimentation

A technology of excess sludge and electrochemistry, used in chemical instruments and methods, biological sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as cumbersome processes, achieve high purity, reduce quantity and resources The effect of reducing and reducing dosing

Pending Publication Date: 2018-03-20
HENAN NORMAL UNIV
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Problems solved by technology

In this process, it is necessary to control the reaction process by monitoring the concentration of ammonia nitrogen and phosphate in the digestive liquid, an

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  • Device and method for recycling nitrogen and phosphorus in excess sludge through electrochemical sedimentation

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[0016] The above-mentioned contents of the present invention are described in further detail below through the examples, but this should not be interpreted as the scope of the above-mentioned themes of the present invention being limited to the following examples, and all technologies realized based on the above-mentioned contents of the present invention all belong to the scope of the present invention. The present invention will be described in detail below through embodiments and in conjunction with the accompanying drawings.

[0017] Refer to attached figure 1 , a device for electrochemical precipitation recovery of nitrogen and phosphorus in excess sludge, including excess sludge pool 1, excess sludge anaerobic fermentation tank 2, fermentation broth sedimentation tank 3, electrochemical reaction tank 4 and water storage tank 5, wherein the remaining The sludge tank 1 is connected to the excess sludge anaerobic fermentation tank 2 through the pipeline and the excess sludg...

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Abstract

The invention discloses a device and method for electrochemical precipitation recovery of nitrogen and phosphorus in surplus sludge. The device comprises surplus sludge tank, surplus sludge anaerobic fermentation tank, fermentation liquid sedimentation tank, electrochemical reaction tank and water storage tank. The electrochemical reaction tank has built-in anode magnesium rods and cathode carbon rods to realize the recovery of nitrogen and phosphorus in the remaining sludge by forming struvite. The method of using this device to recover nitrogen and phosphorus in excess sludge is as follows: introduce the anaerobic fermentation liquid of excess sludge into the electrochemical reaction tank to provide ammonia nitrogen and phosphorus, and under the action of a direct current electric field, electron transfer occurs between the anode magnesium rod and the cathode carbon rod to provide Mg2+ and OH‑, free-settled struvite crystals in the conical precipitation zone for recovery, and the supernatant after nitrogen and phosphorus removal overflowed into the water storage tank. The device of the invention can realize synchronous recovery of nitrogen and phosphorus in excess sludge without additional addition of magnesium ion reagents, and the recovery product has considerable economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of recovery of nitrogen and phosphorus in excess sludge, and in particular relates to a device and method for electrochemical precipitation recovery of nitrogen and phosphorus in excess sludge. Background technique [0002] At present, urban sewage plants mostly use biological nitrogen and phosphorus removal technology to remove nitrogen and phosphorus. Phosphorus is an indispensable element for life activities and the leading factor causing eutrophication of water bodies. It is also a non-renewable resource, and its recycling is imperative. Biological phosphorus removal uses the action of phosphorus accumulating bacteria to transfer various forms of phosphorus in sewage to the remaining sludge, and finally realizes the reduction of effluent phosphorus concentration through sludge discharge. Essentially, it's just a shift of phosphorous, from the water phase to the mud phase. The real removal of phosphorus...

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Application Information

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IPC IPC(8): C02F11/04C02F1/461
CPCC02F1/46104C02F11/04C02F2303/06
Inventor 吕景花王建信李云蓓袁广恩鲍林林
Owner HENAN NORMAL UNIV
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