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Efficient nitrogen recovery device and process for sewage

A recovery device and high-efficiency technology, applied in the field of high-efficiency nitrogen recovery devices for sewage, can solve the problems of excessive effluent quality, low concentration, and difficulty in reusing regenerated liquid, and achieve the effect of improving regeneration rate and regeneration efficiency.

Pending Publication Date: 2020-12-18
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a high-efficiency nitrogen recovery device and process for sewage, which can solve the problem of NH in mainstream sewage 4 + -N concentration is low, and the existing technology is not suitable for urban sewage nitrogen recovery. It can also solve the problem of high regeneration cost of ammonia nitrogen ion exchanger and difficult reuse of regeneration liquid in the existing technology. It can also solve the problem of low nitrogen removal efficiency in sewage treatment plants. Low, requires a large area, and the quality of effluent water is easy to exceed the standard

Method used

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  • Efficient nitrogen recovery device and process for sewage
  • Efficient nitrogen recovery device and process for sewage
  • Efficient nitrogen recovery device and process for sewage

Examples

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Embodiment 1

[0117] This example proposes a high-efficiency nitrogen recovery technology based on the mainstream ammonia nitrogen ion exchange-regeneration-side flow biological nitrification-electrodialysis concentration-evaporation crystallization process, that is, the CAIRB process. The process flow is as follows figure 1 As shown, it includes ammonia nitrogen ion exchange, regeneration, hardness ion removal, biological nitrification, electrodialysis concentration and evaporation crystallization unit. The ammonia nitrogen ion exchange unit includes a sewage water inlet pump 8 , a sewage water inlet valve 19 , an ammonia nitrogen ion exchange column 1 filled with ion exchangers, and a drain valve 20 connected in sequence. The regeneration unit includes a regeneration liquid storage tank 2 connected in sequence, a regeneration liquid inlet pump 9 and a regeneration liquid inlet valve 21, the regeneration liquid storage tank 2 is filled with regeneration liquid, the regeneration liquid stor...

Embodiment 2

[0121] Influent COD, TN, NH of a sewage treatment plant 4 + -N, TP concentrations are 244.7, 27.3, 23.9, 3.0mg / L respectively, after treatment, they need to meet the requirements of GB18918-2002 Grade A standard (COD4 + -N<5mg / L, TP<0.5mg / L). The CAIRB process of Example 1 was used to carry out the pilot test research, the treated water volume was 2 tons / day, and the duration was 120 days.

[0122]The coagulant and flocculant used in CEPT are aluminum sulfate and anionic polyacrylamide (PAM), with dosages of 30 and 0.3 mg / L, respectively. The coagulation stirring speed was 200r / min, and the HRTs of the coagulation, flocculation and precipitation stages were 2, 8 and 30min, respectively. The CEPT effluent enters the ammonia nitrogen ion exchange column 1 from the sewage inlet pump 8 through the inlet valve 19. The ammonia nitrogen ion exchange column 1 has a volume of 5L and is filled with natural zeolite. The EBCT is 30min, the adsorption operation time is 20h, the water v...

Embodiment 3

[0129] for NH 4 + - A black and odorous water body with a N concentration of 15mg / L needs to be treated to meet the requirements of the IV water standard (1.5mg / L) in GB3838-2002. Using the CAIRB process for pilot study (refer to attached figure 2 ), the biological treatment unit uses BAF. The amount of water treated in the pilot plant is 1.0 tons per day, and the duration is 30 days.

[0130] This example is roughly the same as Example 2, and polyaluminum ferric sulfate (20 mg / L) and anion PAM (0.3 mg / L) are selected as coagulation and flocculants. The black and odorous water is first treated by coagulation and sedimentation, and then pumped into the AIR unit. The ammonia nitrogen ion exchange agent in the ammonia nitrogen ion exchange column 1 is a cationic resin, and 5 sets of ammonia nitrogen ion exchange columns are used to operate in parallel, 2 sets are reserved, and the EBCT control is 15 minutes. AIR unit effluent is pumped into BAF (HRT=2h) to further remove org...

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Abstract

The invention relates to an efficient nitrogen recovery device and process for sewage. The device comprises an ammonia nitrogen ion exchange unit connected into a mainstream sewage treatment pipe, anda regenerated liquid storage tank connected with the ammonia nitrogen ion exchange unit through a regenerated liquid circulating pipe to form circulation, The regenerated liquid storage tank is alsosequentially connected with a magnesium removal sedimentation tank, a calcium removal sedimentation tank, a biological nitrification reactor, an electrodialysis module and an evaporation concentrationmodule, and the biological nitrification reactor is also connected with the regenerated liquid storage tank in a returning manner. Compared with the prior art, the process has the advantages that theregenerated liquid with high NH4 < + >- N concentration is subjected to nitrogen recovery, so that synchronous nitrogen emission reduction and nitrogen recovery of mainstream ammonia nitrogen ion exchange-regeneration enrichment-biological nitrification-electrodialysis concentration-evaporation crystallization are realized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and sewage treatment, and relates to a high-efficiency nitrogen recovery device and process for sewage. Background technique [0002] From the perspective of the global nitrogen cycle, the conversion of nitrogen into reactive nitrogen used by human society is one of the three major global issues that have surpassed the boundaries of sustainable development. Global anthropogenic activities have severely disrupted the nitrogen cycle, with 120 million tons of nitrogen converted into reactive forms of nitrogen each year. The Haber-Bosch process captures the inert nitrogen in the atmosphere and uses it to synthesize ammonia, but the process consumes a lot of energy, accounting for 1-2% of the global total annual energy consumption. Part of the synthetic ammonia is catalytically oxidized by the Ostwald process to produce nitric acid and nitrates. Most of the reactive nitrogen synthesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/10C02F101/16
CPCC02F9/00C02F1/42C02F1/5281C02F1/04C02F1/4693C02F3/1236C02F3/1205C02F1/5236C02F3/302C02F2101/16C02F2101/10C02F2303/14C02F2301/043
Inventor 周振王凯冲袁瑶余司颀覃阳洁安莹肖凯琦左艺张茂楠赵晓丹夏庆
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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