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Method for removing nitrogen and phosphorus from wastewater of sludge treatment system

A technology for sludge treatment, denitrification and phosphorus removal, applied in the direction of water/sludge/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of increasing the nitrogen and phosphorus load of the sewage treatment system and Sewage treatment plants deal with problems such as cost, to achieve the effect of shortening hydraulic retention time, reducing cost and improving mechanical properties

Inactive Publication Date: 2012-05-30
DALIAN CHUANGDA TECH TRADE MARKET
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Problems solved by technology

The return of wastewater from the sludge treatment system to the sewage treatment system not only increases the nitrogen and phosphorus load of the sewage treatment system and the treatment cost of the sewage treatment plant, but also affects the biological denitrification and phosphorus removal effects of the biological denitrification and dephosphorization process and the sludge resources. utilization has a greater impact

Method used

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  • Method for removing nitrogen and phosphorus from wastewater of sludge treatment system
  • Method for removing nitrogen and phosphorus from wastewater of sludge treatment system

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Embodiment

[0015] The concentrations of ammonia nitrogen, phosphorus and COD in the sludge thickening tank and sludge dewatering mixed wastewater of a city sewage treatment plant in Guangxi are 2 5.71 mg / L, 1 6.67 mg / L and 145 mg / L respectively. After adjusting the pH value of the mixed wastewater to 9.5 with L NaOH solution, add 0.05m0 l / L MgCl: to make the N:P:Mg ratio of the mixed wastewater 1.1:1:1.3, and the mixer starts to stir , the speed of the mixer is 100r / min, and the mixing time is 10min.

[0016] Then the mixed wastewater began to settle. After 30 minutes of precipitation, the effluent concentration of ammonia nitrogen was 2.28 mg / L, that of phosphorus was 1.35 mg / L, and that of COD was 1.28 mg / l. The removal rates of nitrogen and phosphorus reached 9 1 respectively. % and 92%, the unit water treatment cost is only 0.2 yuan / m. (Among them, the medicine fee is 0.02 yuan / m., and the energy consumption is 0.18 yuan / m.). Significant economic and environmental benefits.

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Abstract

The invention discloses a method for removing nitrogen and phosphorus from wastewater of a sludge treatment system. The method comprises specific steps of: after adjusting pH value of the mixed wastewater of the sludge treatment system to 8.5-10 by adopting 0.5-5 mol / L of a NaOH solution, adding 0.05-1.0 mol / L of MgCl2 to enable a molar ratio of N: P: Mg in the mixed wastewater to be 1-1.1: 1-1.1: 1.2-1.4; and starting mixing by a mixing machine at a rotating speed of 100 t / min to 200 r / min for 10-15 min. The method disclosed by the invention can remove nitrogen and phosphorus from wastewater of the sludge treatment system at the same time, thereby lowering nitrogen load and phosphorus load in the sludge treatment system and reducing the production cost.

Description

[0001] technical field [0002] The invention relates to a method for using Mgcl to denitrify and dephosphorize waste water in a sludge treatment system. Background technique [0003] Nitrogen and phosphorus pollution are important factors leading to eutrophication of water bodies. With the continuous improvement of people's requirements for water environment quality, urban sewage treatment plants have gradually achieved nitrogen and phosphorus removal, so sewage treatment plant sludge treatment system wastewater (including sludge concentration, sludge dehydration and sludge digestion wastewater) ) content of nitrogen and phosphorus is getting higher and higher, and its nitrogen and phosphorus load reaches 30% to 55% of the total nitrogen and phosphorus load of sewage treatment plants, and some are even higher. The return of wastewater from the sludge treatment system to the sewage treatment system not only increases the nitrogen and phosphorus load of the sewage treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01B25/45C02F1/66
Inventor 陈洋
Owner DALIAN CHUANGDA TECH TRADE MARKET
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