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Processing system and method for recovering phosphorus from excess sludge obtained after municipal sewage treatment

A technology for urban sewage and excess sludge, applied in water/sludge/sewage treatment, sludge treatment, biological sludge treatment, etc., can solve the problems of sludge phosphorus waste, phosphorus secondary pollution, etc., and achieve clean phosphorus resources , Improve the phosphorus release rate and shorten the phosphorus release time

Inactive Publication Date: 2012-10-03
BEIJING YIPU INT WATER AFFAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In order to overcome the disadvantages that the phosphorus in the excess sludge after sewage treatment is easy to cause secondary pollution and the phosphorus in the sludge is seriously wasted, the embodiment of the present invention provides a method for recovering phosphorus from the excess sludge after urban sewage treatment. The treatment system and method can fully release the phosphorus in the excess sludge, and recover clean phosphorus resources by adding chemicals

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  • Processing system and method for recovering phosphorus from excess sludge obtained after municipal sewage treatment

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Embodiment 1

[0025] This embodiment provides a treatment system for recovering phosphorus from excess sludge after urban sewage treatment, for recovering phosphorus from excess sludge after sewage treatment, such as figure 1 As shown, the processing system includes:

[0026] Mixing tank 1, anaerobic phosphorus release tank 2, sand filter tank 3, chemical reaction tank 4, sedimentation tank 5, sludge thickening tank 6 and sludge dewatering machine 7;

[0027] Among them, the mixing tank 1 is provided with an inlet A for introducing the remaining sludge after urban sewage treatment, and the outlet of the mixing tank 1 is connected with the anaerobic phosphorus release tank 2, the sand filter tank 3, the chemical reaction tank 4 and the sedimentation tank 5 in sequence The mixing tank 1 is provided with a carbon source inlet B and an alkali solution inlet C, which is used to add a carbon source and an alkali solution into the mixing tank 1, and the mixing tank 1 is also provided with a stirri...

Embodiment 2

[0035] This embodiment provides a treatment for reclaiming phosphorus from the surplus sludge after urban sewage treatment, which is a method for treating surplus sludge using the treatment system given in the first embodiment above, the method comprising:

[0036] Stir and mix the remaining sludge after urban sewage treatment with the added carbon source and lye in the mixing tank;

[0037] The stirred and mixed sludge enters the anaerobic phosphorus release tank, and phosphorus is released under stirring, and the stirring speed gradient is controlled at ≤280S -1 , the residence time of the sludge in the anaerobic phosphorus release tank is 4 to 6 hours;

[0038] After the anaerobic phosphorus release tank releases phosphorus, the supernatant effluent enters the sand filter for filtration, and the suspended solids in the supernatant are filtered out;

[0039] The effluent filtered by the sand filter enters the chemical reaction tank and reacts with the phosphorus removal sol...

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Abstract

The invention discloses processing system and method for recovering phosphorus from excess sludge obtained after municipal sewage treatment. The processing system comprises a mixed tank, an anaerobic phosphorus releasing tank, a sand filtering tank, a chemical reaction tank, a settling tank, a sludge concentration tank and a sludge dewatering machine, wherein the mixed tank is sequentially connected with the anaerobic phosphorus releasing tank, the sand filtering tank, the chemical reaction tank and the settling tank and is provided with a carbon source inlet and an alkali liquor inlet; the mixed tank and the anaerobic phosphorus releasing tank are both internally provided with stirring equipment; the chemical reaction tank is provided with a phosphorus removing agent inlet; the sludge discharge opening of the settling tank is connected with the sludge concentration tank; the sludge discharge opening of the sludge concentration tank is connected with the sludge dewatering machine; andthe sludge outlet of the sludge dewatering machine is used as an output port. The processing system greatly enhances the phosphorus releasing rate of the sludge by arranging the stirring equipment inthe anaerobic phosphorus releasing tank and solves the problem of higher concentration of suspended matters contained in the supernate of the anaerobic phosphorus releasing tank by additionally arranging the sand filtering tank behind the anaerobic phosphorus releasing tank, thereby enabling the recovered phosphorus resources to be cleaner.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a treatment system and method for recovering phosphorus from residual sludge after urban sewage treatment. Background technique [0002] Phosphorus is the minimum limiting factor for autotrophic organisms in water bodies. When the concentration of phosphorus in water reaches 0.015mg / L, it will cause eutrophication of water body. At the same time, phosphorus is an element with almost one-way cycle in nature. Due to the mining of phosphate rock and the almost one-way cycle of phosphorus in nature, phosphorus resources are increasingly depleted. Appropriate treatment technology and effective recovery methods can not only effectively control the eutrophication of water bodies, but also obtain available phosphorus resources, which is of great significance to prolong the service life of phosphorus rock resources. [0003] There are three main methods for removing phosphorus nutrients i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04
Inventor 王发珍张宝林李天增王凯张春艳
Owner BEIJING YIPU INT WATER AFFAIRS
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