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Nitrogen and phosphorus advanced treatment system and method for sewage treatment

A technology for advanced treatment and sewage treatment, applied in the field of water treatment, can solve problems such as inability to realize nitrogen and phosphorus recycling, phosphorus does not have selective adsorption, and effluent ammonia nitrogen exceeds the standard, so as to reduce the risk of eutrophication, low cost, and high response speed effect

Inactive Publication Date: 2019-10-29
芜湖沃泰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of the biological treatment method is low, but each link needs to strictly control the aerobic and anaerobic conditions and the residence time is long, and as the external environment changes, the activities of microorganisms are affected, and the ammonia nitrogen in the effluent often exceeds the standard, and the effluent still exists. Excessive phosphorus discharge, and the recovery and utilization of nitrogen and phosphorus cannot be realized
[0003] As a selective adsorption technology, ion exchange is widely used in the field of sewage and water treatment. Its application equipment is simple, but ordinary resin materials do not have selective adsorption for phosphorus.

Method used

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  • Nitrogen and phosphorus advanced treatment system and method for sewage treatment
  • Nitrogen and phosphorus advanced treatment system and method for sewage treatment
  • Nitrogen and phosphorus advanced treatment system and method for sewage treatment

Examples

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example 1

[0044] Rural domestic sewage needs to be discharged up to the standard, and the enriched ammonia nitrogen should be recycled into high-purity nitrogen and phosphorus fertilizers. Taking rural domestic sewage as the influent water source as an example, the influent NH3-N, TP and BOD5 are respectively 8~44.7ppm and 2~ 8.2ppm and 9-20ppm, the traditional treatment method A2O process equipment (the first-level biological nitrogen and phosphorus removal system of the present invention) has an average removal efficiency of ammonia nitrogen of 42.9% and an average removal rate of 67% of total phosphorus. Different seasons The treatment efficiency is: summer>spring>winter. And the traditional treatment method cannot recover nitrogen and phosphorus for reuse. After the same water is treated by the scheme of the present invention, the overall denitrification and phosphorus removal effect of the system is improved, and the removal rate of ammonia nitrogen and total phosphorus can reach mo...

example 2

[0046] Urban domestic sewage is collected by the urban drainage pipe network and transported to the sewage treatment plant for treatment. The effluent needs to meet the level A discharge standard. Taking urban domestic sewage as the influent water source as an example, the influent NH3-N, TP and BOD5 are respectively 6-27.3ppm, 0.8-4.9ppm and 10-25ppm, the traditional treatment method, the average removal efficiency of effluent ammonia nitrogen is 51.2%, the average removal rate of total phosphorus is 65%, and the average removal rate of BOD5 is 85%. Most of the organic matter in the wastewater is used as the organic nutrients of the different microorganisms, and finally converted into microorganisms and CO2, H2O. According to the Level 1 A standard in the "Emission Standard of Pollutants for Urban Wastewater Treatment Plants" (GB18918-2002), its emission indicators are shown in the following table.

[0047]

[0048] The same water passes through the nitrogen and phosphorus advan...

example 3

[0050] In order to avoid eutrophication, surface eutrophic water bodies need to meet the environmental quality standards of surface water. Taking river water as an influent source for example, the influent NH3-N, TP and BOD5 are respectively 2.6~17.3ppm, 0.3~2.0ppm and 10~ 28ppm, according to the traditional treatment method, the average removal efficiency of effluent ammonia nitrogen is 52.2%, and the average removal rate of total phosphorus is 69%. According to the surface water environmental quality standard (GB3838-2002), its indicators are shown in the following table, unit: mg / L.

[0051] Type I Type II Class III Type IV Class Ⅴ NH3-N0.150.511.52 TP 0.020.10.20.30.4

[0052] The same water is treated by the technical scheme of the present invention. After passing through the zeolite filter and the resin filter, the overall denitrification and phosphorus removal effect of the system is improved, and the removal rate of ammonia nitrogen and total phosphorus can reach mor...

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Abstract

The invention relates to the technical field of water treatment, in particular to a nitrogen and phosphorus advanced treatment system for sewage treatment. The nitrogen and phosphorus advanced treatment system comprises a pretreatment system, a first-stage biological denitrification and phosphorus-removal system and a second-stage advanced denitrification and phosphorus-removal system, and the pretreatment system is composed of a coarse screen filtering tank, a fine screen filtering tank and a first stage sedimentation tank which are connected in turns through pipelines; the first biological denitrification and phosphorus-removal system is composed of an anaerobic tank, an anoxic tank and an aerobic tank which are connected in turns through pipelines; and the second-stage advanced denitrification and phosphorus-removal system is composed of a secondary sedimentation tank, a filtering tank, a disinfection tank, a zeolite filter, a resin filter and a mixed sedimentation tank which are connected in turns through pipelines. By combining the first-stage biological denitrification and phosphorus-removal system and the second-stage advanced denitrification and phosphorus-removal system, the advanced treatment of nitrogen and phosphorus in sewage is realized, the risk of eutrophication of water bodies is reduced, and by simultaneously adopting novel materials and a regeneration process, the selective adsorption and concentration of nitrogen and phosphorus are realized, and recycling of nitrogen and phosphorus is realized.

Description

Technical field [0001] The invention relates to the technical field of water treatment, in particular to a nitrogen and phosphorus advanced treatment system for sewage treatment and a treatment method thereof. Background technique [0002] Excessive discharge of nitrogen and phosphorus in modern domestic sewage can cause serious water pollution. At the same time, the decline of phosphate rock resources is a serious problem facing mankind. It is of great significance to human society to realize the advanced treatment of nitrogen and phosphorus and other nutrient elements to reduce the harm to the environment and to recycle nitrogen and phosphorus to achieve sustainable development. A common biological treatment method for large amounts of domestic sewage is to use microorganisms to nitrify and denitrify ammonia nitrogen to make the nitrogen in the water enter the atmosphere. Microbial phosphorus removal uses microorganisms to enrich phosphorus in the water body and then discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/28C02F1/32C02F1/42C02F3/30C02F9/00C02F2001/007C02F2101/38C02F2303/04C02F2303/16
Inventor 董航田琳
Owner 芜湖沃泰环保科技有限公司
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