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Bicirculating nitrogen and phosphorus removal wastewater treatment system and method

A wastewater treatment system and a technology for denitrification and dephosphorization, applied in the field of water treatment, can solve the problems of low denitrification and dephosphorization efficiency, insufficient utilization of carbon sources, large dosage of dephosphorization agents, etc., to achieve improved effect and low cost Effect

Active Publication Date: 2017-04-19
HUAQI ENVIRONMENT PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a dual-cycle nitrogen and phosphorus removal wastewater treatment system and its method, which successfully solves the problems of insufficient carbon source utilization in raw water and the addition of phosphorus removal agents in the traditional biological aerated filter process. Excessive amount of water, frequent backwashing cycles of biofilter, low efficiency of nitrogen and phosphorus removal, etc.

Method used

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  • Bicirculating nitrogen and phosphorus removal wastewater treatment system and method
  • Bicirculating nitrogen and phosphorus removal wastewater treatment system and method
  • Bicirculating nitrogen and phosphorus removal wastewater treatment system and method

Examples

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Effect test

Embodiment 1

[0035] A domestic sewage treatment plant with a treatment capacity of 10,000 m 3 / d, influent COD concentration is 240mg / L, TP 12mg / L, NH 3 -N (ammonia nitrogen) concentration is 42mg / L, TN (total nitrogen) is 60mg / L, and suspended solids (SS) is 135 mg / L. Sewage is treated sequentially through a flow-type membrane mud coupling tank, a sedimentation tank, an aerobic nitrification biological filter, and a chemical phosphorus removal tank. The hydraulic retention time of the mobile membrane-slime coupling tank is 2 hours, the reflux ratio of nitrification liquid is 130%, and the sludge reflux ratio is 50%; the dissolved oxygen of the aerobic nitrification biological filter is 4.0 mg / L, and the hydraulic retention time is 3 hours. The final effluent meets the first-class A discharge standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002).

Embodiment 2

[0037] A chemical wastewater treatment plant with a treatment capacity of 3,000 m 3 / d, influent COD concentration is 2240mg / L, TP 42mg / L, NH 3 -N (ammonia nitrogen) concentration is 90mg / L, TN (total nitrogen) is 600mg / L, and suspended solids (SS) is 635 mg / L. Sewage is treated sequentially through a flow-type membrane mud coupling tank, a sedimentation tank, an aerobic nitrification biological filter, and a chemical phosphorus removal tank. The hydraulic retention time of the flowing membrane-slime coupling tank is 12h, the reflux ratio of nitrification liquid is 280%, and the sludge reflux ratio is 80%; the dissolved oxygen of the aerobic nitrification biological filter is 5.0mg / L, and the hydraulic retention time is 12h. Final effluent COD concentration is 110mg / L, TP 0.03mg / L, NH 3 -N (ammonia nitrogen) concentration is 3mg / L, TN (total nitrogen) is 58mg / L, and suspended solids (SS) is 11mg / L.

Embodiment 3

[0039] A domestic sewage treatment plant with a treatment capacity of 10,000 m 3 / d, influent COD concentration is 220mg / L, TP 11mg / L, NH 3 -N (ammonia nitrogen) concentration is 46mg / L, TN (total nitrogen) is 65mg / L, and suspended solids (SS) is 115 mg / L. Sewage is treated sequentially through a fixed membrane-mud coupling pond, a sedimentation pond, an aerobic nitrification biological filter, and a chemical phosphorus removal pond. The hydraulic retention time of the fixed membrane-mud coupling pool is 1h, the reflux ratio of nitrification liquid is 150%, and the sludge reflux ratio is 70%; the dissolved oxygen of the aerobic nitrification biological filter is 5.0mg / L, and the hydraulic retention time is 2h. The final effluent meets the first-class A discharge standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002).

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Abstract

The invention discloses a bicirculating nitrogen and phosphorus removal wastewater treatment system and method. The system is formed by serially connecting a membrane-sludge coupling pool, a settling pool, an aerobiotic nitration biofilter pool and a chemical phosphorus removal pool in sequence; a sludge return apparatus is arranged between the settling pool and the membrane-sludge coupling pool; and a nitration solution return apparatus is arranged between the aerobiotic nitration biofilter pool and the membrane-sludge coupling pool. According to the system, wastewater treatment is realized through a nitrogen and carbon removal hydrolysis reaction, a sludge-water separation reaction and a carbon removal nitration reaction; the problems of insufficient utilization of raw water carbon sources, complex pretreatment and frequent back-flushing of a conventional biological aerated filter pool, and the like can be effectively solved; the nitrogen and phosphorus removal effect is improved; and the system and the method have the characteristics of low cost, biological multiplication and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a dual-cycle nitrogen and phosphorus removal wastewater treatment system and a process method thereof. Background technique [0002] Biological aerated filter (BAF) is a new type of biofilm sewage treatment process developed in recent years. It has the characteristics of high efficiency in nitrogen and carbon removal, small footprint, low operating cost, and no secondary sedimentation tank. However, the biological aerated filter process requires a high concentration of suspended solids in the influent, and requires complex pretreatment, such as commonly used coagulation sedimentation, membrane filtration or other combined processes, which will undoubtedly increase the capacity of the biological aerated filter. The technical process and operation management are difficult, and at the same time, a large amount of organic matter will be removed in the pretreatment...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F1/58
CPCC02F1/58C02F3/30C02F3/302C02F2301/04
Inventor 郑俊张德伟郑杰
Owner HUAQI ENVIRONMENT PROTECTION SCI & TECH
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