Sewage treatment system capable of intensifying biological denitrification and chemical dephosphorization and technical method

A sewage treatment device and denitrification chemical technology, applied in the direction of biological water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., to achieve the effects of easy dehydration, easy production implementation, and simple control

Inactive Publication Date: 2017-09-29
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, potassium ferrate is mainly used for disinfection and sludge reduction; the induced crystallization process can realize the recovery and reuse of nutrients such as phosphate and ammonia nitrogen in wastewater; The advantages of the three technologies to treat low carbon nitrogen ratio sewage have not been reported

Method used

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  • Sewage treatment system capable of intensifying biological denitrification and chemical dephosphorization and technical method
  • Sewage treatment system capable of intensifying biological denitrification and chemical dephosphorization and technical method

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Experimental program
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Effect test

Embodiment 1

[0030] The influent water quality of a city sewage plant is as follows: COD C 268mg / L, NH + 4 -N is 30.1mg / L, NO 3 - -N was 1.1 mg / L, TN was 35.5 mg / L, and TP was 4.52 mg / L. Adopting the technological method of the present invention to carry out biological denitrification and chemical phosphorus removal, the specific implementation is as follows:

[0031] (1) The main parameters of the biological treatment system of the present invention are as follows: anaerobic, anoxic and aerobic residence times are respectively 1.5h, 2.0h and 4.0h; the dissolved oxygen concentration in the aerobic tank is 2mg / L; the sludge in the aerobic tank The concentration is 2800mg / L; the reflux ratio of sludge is 0.8, and the reflux ratio of nitrification solution is 2.0; the induced crystallization liquid is refluxed to the anoxic tank; the sludge age is 14 days, and intermittent sludge is discharged twice a day. Mud time is 0.5h.

[0032] (2) control parameter of surplus sludge oxidative deco...

Embodiment 2

[0040] The influent water quality of a city sewage plant in the rainy season is as follows: COD C 158mg / L, NH + 4 -N is 20.5mg / L, NO 3 - -N was 0.9 mg / L, TN was 25.9 mg / L, and TP was 4.8 mg / L. Adopt technological method of the present invention to carry out enhanced biological phosphorus removal, the specific implementation mode is:

[0041] (1) The main parameters of the biological treatment system of the present invention are as follows: anaerobic, anoxic and aerobic residence times are respectively 1.5h, 2.0h and 4.0h; the dissolved oxygen concentration in the aerobic tank is 1.5mg / L; The sludge concentration is 2100mg / L; the reflux ratio of sludge is 0.8, and the reflux ratio of nitrification solution is 1.5; the induced crystallization liquid is refluxed to the anaerobic tank; The mud discharge time is 0.5h.

[0042] (2) control parameter of surplus sludge oxidative decomposition system of the present invention is as follows: enter mud (dosing) and reaction time alt...

Embodiment 3

[0050] The influent water of a city sewage plant contains some industrial wastewater, and its influent water quality is as follows: COD C 358.8mg / L, NH + 4 -N is 45.0mg / L, NO 3 - -N is 1.5 mg / L, TN is 62.0 mg / L, and TP is 5.5 mg / L. Adopting the technological method of the present invention to strengthen biological denitrification and chemical phosphorus removal, the specific implementation method is:

[0051] (1) The main parameters of the biological treatment system of the present invention are as follows: anaerobic, anoxic and aerobic residence times are respectively 2.0h, 2.5h and 6.0h; the dissolved oxygen concentration in the aerobic pond is 2.5mg / L; The sludge concentration is 3500mg / L; the sludge reflux ratio is 0.8, and the nitrifying liquid reflux ratio is 2.0; the induced crystallization liquid is refluxed to the anoxic tank; the sludge age is 15 days, and intermittent sludge discharge is adopted, and the sludge is discharged twice a day, each time The mud disch...

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Abstract

The invention discloses a sewage treatment system capable of intensifying biological denitrification and chemical dephosphorization and a technical method. The system mainly comprises a biological treatment system, a residual sludge oxidative decomposition system, and an induced crystallization dephosphorization and recovery system; an induced crystallization dephosphorization reactor is respectively connected to the water inlets of an anaerobic tank and an anoxic tank in the biological treatment system through a crystalline liquid reflux unit; a secondary setting tank in the biological treatment system is connected to the water inlet of the anoxic tank through a nitrification liquid reflux unit; and the secondary setting tank in the biological treatment system is connected to the water inlet of the anaerobic tank through a sludge reflux unit. In the technical method disclosed by the invention, crystalline reflux liquid which contains high-concentration SCOD (soluble chemical oxygen demand) can reflux to the anoxic tank to undergo intensified denitrification treatment or reflux to the anaerobic tank to undergo intensified dephosphorization treatment. The invention can reduce the contradiction between biological denitrification and biological dephosphorization, both the efficiency of denitrification and the efficiency of dephosphorization are high, moreover, the amount of sludge produced by the system is less, the system is easy to control, production can be easily implemented, and the invention has a potential broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment device and method for strengthening biological denitrification and chemical phosphorus removal, which is suitable for the treatment of urban domestic sewage, low carbon-to-nitrogen ratio sewage, high-concentration nitrogen-phosphorus industrial wastewater and rural domestic sewage treatment . Background technique [0002] my country's urban sewage has the characteristics of low carbon-to-nitrogen ratio, and the conventional synchronous denitrification and phosphorus removal process, such as A 2 O process, etc., there are contradictions and problems such as carbon source competition and sludge age when treating the wastewater, and there will also be problems such as large surplus sludge production and difficult dehydration. Therefore, it is one of the research hotspots in the field of sewage treatment to develop new efficient simultaneous d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/08C02F11/00
CPCC02F9/00C02F11/00C02F11/08C02F2209/18C02F2209/16C02F2209/14C02F2209/105C02F2209/08C02F3/30C02F3/308C02F2001/007C02F2103/001
Inventor 邓仁健金昌盛唐智娥侯保林任伯帜邵让
Owner HUNAN UNIV OF SCI & TECH
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