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Two-stage sludge reflux enhanced coagulation technology

A sludge return and coagulation technology, applied in water/sludge/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as ineffectiveness, increased operating costs, and deterioration of effluent quality , to achieve the effect of enhanced impact load resistance, increased sedimentation speed, and less dosage of chemicals

Inactive Publication Date: 2012-04-18
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the traditional coagulation technology has the following problems: it needs to add a large amount of chemical agents, thus increasing the operating cost; it produces a large amount of chemical sludge, which makes the subsequent treatment of sludge difficult; it mainly removes various suspended particles and Colloidal substances, the removal effect of phosphorus, heavy metals and organic pollutants in water is not ideal
However, this method has a significant disadvantage: due to the release of pollutants into the water body by the flocculation particles formed in the return sludge, the "back-mixing phenomenon" occurs, resulting in the deterioration of the final effluent quality
At present, some researchers have found that adding a small amount of coagulant can solve the problem of deterioration of the final effluent quality caused by backmixing, but it does not work for some sewage, such as dye wastewater

Method used

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  • Two-stage sludge reflux enhanced coagulation technology

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Effect test

Embodiment 1

[0018] Taking the simulated phosphorus-containing water as an example, the phosphorus concentration of the simulated phosphorus-containing water is 2.0 mg / L, and the pH is 7.5. Using aluminum-modified red mud as coagulant, a two-stage sludge return enhanced coagulation process is adopted, and the sludge return ratio is 15%. When the dosage of aluminum-modified red mud is 35mg / L (the primary dosage is 20mg / L, and the secondary dosage is 15mg / L), the phosphorus concentration in the effluent is 0.40mg / L, reaching the level of urban sewage treatment plant. A emission standard. With the traditional coagulation process, under the same dosage, the phosphorus concentration in the effluent is 0.60mg / L.

Embodiment 2

[0020] Taking the simulated phosphorus-containing water as an example, the phosphorus concentration of the simulated phosphorus-containing water is 2.0 mg / L, and the pH is 7.5. Ordinary polyaluminium chloride (PAC) was used as coagulant, and a two-stage sludge return enhanced coagulation process was adopted, with a sludge return ratio of 10%. When the dosage of PAC is 40mg / L (the primary dosage is 25mg / L, the secondary dosage is 15mg / L), the phosphorus concentration in the effluent is 0.40mg / L, which meets the first-class A discharge standard of urban sewage treatment plants. With the traditional coagulation process, under the same dosage, the phosphorus concentration in the effluent is 0.70mg / L.

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Abstract

The invention relates to a two-stage sludge reflux enhanced coagulation technology, characterized in that: a two-stage serial coagulation technology is adopted to allow the partial precipitated fresh sludge of stage-2 coagulation to return to stage-1 coagulation with a certain reflux ratio. Compared with the traditional coagulation method, the technology disclosed herein can better utilize the effects of a coagulant in charge neutrality, net capturing, enmeshment, and physical absorption, remove particles with smaller particle sizes, increase the sedimentation rate of floc particles, reduce the addition quantity of the coagulant, increase the coagulation effect, and enhance the operation stability of the system. The technology can be widely applied in water supply and waste water treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment for environmental protection, and in particular relates to a two-stage sludge reflux enhanced coagulation process, which can be widely used for pretreatment or advanced treatment of water supply and waste water treatment. Background technique [0002] In recent years, my country's water environment pollution has become increasingly serious. Water pollution has exacerbated the contradiction between supply and demand of my country's water resource shortage, and has become a "bottleneck" problem restricting the sustainable development of my country's social economy. [0003] At present, commonly used water treatment technologies mainly include coagulation method, biochemical method, adsorption method, membrane method and so on. Among them, coagulation, as one of the important methods of water treatment, is widely used in various water treatment processes. The quality of its coagulation effe...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52
Inventor 栾兆坤赵颖贾智萍
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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