Double-circulation nitrogen and phosphorus removal wastewater treatment system and process

A wastewater treatment system and 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., and achieves low cost and improved effect. Effect

Inactive Publication Date: 2016-09-28
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 process, 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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  • Double-circulation nitrogen and phosphorus removal wastewater treatment system and process
  • Double-circulation nitrogen and phosphorus removal wastewater treatment system and process
  • Double-circulation nitrogen and phosphorus removal wastewater treatment system and process

Examples

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Effect test

Embodiment 1

[0025] 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 135mg / 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 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

[0027] 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 635mg / 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 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

[0029] 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 115mg / 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 double-circulation nitrogen and phosphorus removal wastewater treatment system and process. The system is composed of a membrane mud coupling pool, a sedimentation pool, an aerobic nitrifying biofilter pool and a chemical phosphorus removal pool which are connected in series successively; a sludge backflow device is arranged between the sedimentation pool and the membrane mud coupling pool; a nitrifying liquid backflow device is arranged between the aerobic nitrifying biofilter pool and the membrane mud coupling pool. The system achieves wastewater treatment through hydrolysis nitrogen and carbon removal reaction, sludge-water separation reaction, and nitrification and carbon removal reaction. The system can effectively solve the problems that raw water carbon sources are not fully used, a conventional aeration biofilter pool has complex pretreatment and frequent back flushing and the like, improves the nitrogen and phosphorus removal effects, and also has the characteristics of low cost, multiplied organisms 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 waste water treatment system and a process 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 proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16
CPCC02F9/00C02F1/488C02F1/52C02F3/302C02F2001/007C02F2101/16C02F2201/007C02F2301/08
Inventor 郑俊张德伟郑杰
Owner HUAQI ENVIRONMENT PROTECTION SCI & TECH
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