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Method for coagulation-ion exchange-coagulation circulating reflux treatment of secondary effluent

A technology of secondary effluent and ion exchange, applied in ion exchange water/sewage treatment, flocculation/sedimentation water/sewage treatment, chemical instruments and methods, etc. Dosage and other issues to achieve the effect of improving flocculation effect, improving efficiency and reducing turbidity of effluent

Active Publication Date: 2014-06-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102649609A patent discloses a coagulation filtration method to improve water quality, but the effect is not obvious
The design ideas of existing technicians are generally improved by increasing the amount of coagulant, prolonging the coagulation time or developing new ion exchange resins, but before the development of new coagulants and ion exchange resins, these approaches are all increased processing costs

Method used

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  • Method for coagulation-ion exchange-coagulation circulating reflux treatment of secondary effluent
  • Method for coagulation-ion exchange-coagulation circulating reflux treatment of secondary effluent
  • Method for coagulation-ion exchange-coagulation circulating reflux treatment of secondary effluent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 The flow chart of the influent and effluent water of the medium coagulation-ion exchange-coagulation treatment process is shown: a secondary biochemical treatment system using anaerobic, anoxic, and aerobic microorganisms is used, and the effluent enters the coagulation unit. Cr Add 0.06g of polyaluminum chloride, stir at 100rpm for 2min, then reduce the stirring speed to 25rpm, continue stirring for 35min and then stop. After the flocs settle for 90min, discharge all the treated effluent into the anion exchange resin unit; coagulate effluent and D201 The anion exchange resin (see Table 1) reacts; the wastewater treated by the ion exchange resin unit is refluxed to the coagulation unit at a reflux ratio of 50%. Cr Add 0.06g of polyaluminum chloride, stir at 100rpm for 2min, then reduce the stirring speed to 25rpm, continue stirring for 35min and then stop. After the flocs settle for 90min, discharge all the treated effluent to other process sections, su...

Embodiment 2

[0033] Such as figure 1 The flow chart of the influent and effluent water in the medium coagulation-ion exchange-coagulation treatment process is shown: a secondary biochemical treatment system using anoxic, anoxic, and aerobic microorganisms is used, and the effluent enters the coagulation unit, according to the proportion per gram COD Cr Add 0.05g polyferric chloride, 0.004g / gCOD Cr Polyacrylamide (here expressed per gram of COD Cr Add 0.004g polyacrylamide (the same below), stir at 120rpm for 3min, then reduce the stirring speed to 30rpm, continue stirring for 40min and stop, after the flocs settle for 60min, discharge all the treated water into the anion exchange resin unit ; The coagulation effluent reacts with D213 anion exchange resin (see Table 1); the wastewater treated by the ion exchange resin unit is returned to the coagulation unit at a reflux ratio of 70%, and is treated according to the same coagulation conditions as mentioned above, and all of them are treate...

Embodiment 3

[0037] Such as figure 1 The flow chart of the influent and effluent water of the medium coagulation-ion exchange-coagulation treatment process is shown: a secondary biochemical treatment system using anoxic and aerobic microorganisms is used, and the effluent enters the coagulation unit, according to 0.15g / gCOD Cr Add polyaluminum ferric sulfate, stir at 110rpm for 2min, then reduce the stirring speed to 21rpm, continue stirring for 30min and then stop. After the flocs settle for 80min, discharge all the treated effluent into the anion exchange resin unit; the coagulation effluent is exchanged with D320 anion The resin (see Table 1) reacts; the wastewater treated by the ion exchange resin unit is refluxed to the coagulation unit at a reflux ratio of 95%, treated according to the same coagulation conditions as described above, and all the treated wastewater is discharged. This process has a chroma removal rate of 86%, COD Cr The removal rate is 68%, BOD 5 The removal rate is ...

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Abstract

The invention discloses a method for coagulation-ion exchange-coagulation circulating reflux treatment of secondary effluent and belongs to the technical field of water treatment. By virtue of the coagulation-ion exchange-coagulation treatment process, the water quality of the effluent can be effectively improved, the floc particle size and the sedimentation speed in a coagulation unit are increased, and the using amount of a coagulant is reduced; the service life of resin can be prolonged. The process is stable in operation, and by adopting the process, the fluctuations in the water quality can be effectively dealt, the amount of treatment water is increased, and the operation cost is reduced.

Description

technical field [0001] The invention relates to a coagulation-ion exchange-coagulation circulation reflux method for treating secondary effluent. Specifically, after coagulation treatment, the secondary effluent reacts with ion exchange resin; the effluent treated by ion exchange resin Return to the coagulation unit according to a certain reflux ratio to form a combined process of coagulation-ion exchange-coagulation. Background technique [0002] With the increase of population and economic development, the problem of resource water shortage has become increasingly prominent. Wastewater reuse can not only alleviate water demand, but also effectively remove pollutants and avoid environmental pollution. Therefore, wastewater reuse is an important strategic solution to resource water shortage. Usually, after the wastewater is treated by the biochemical system, the organic matter in the effluent has poor biodegradability, complex components, and often contains some insoluble ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/42
Inventor 双陈冬李海波李爱民周庆周伟伟王骏
Owner NANJING UNIV
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