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System and method for treating slightly alkaline secondary effluent through magnetic ion exchange resin coupled catalytic ozonation circulating reflux

An exchange resin, ozone oxidation technology, applied in ion exchange water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc. The effect of small equipment footprint, increased water treatment volume, and improved treatment efficiency

Active Publication Date: 2022-04-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many risk problems in the process of landscape reuse of reclaimed water: such as water eutrophication caused by nitrogen and phosphorus, accumulation and biotoxicity effects caused by effluent organic matter, toxicity and persistence of trace organic pollutants, risk of disease caused by pathogenic microorganisms Wait
At the same time, in the actual regeneration process, the magnetic ion exchange resin also has the problem that the conventional non-magnetic resin cannot be completely regenerated, resulting in a rapid decline in the resin exchange capacity, especially in alkaline water, the deposition of calcium and magnesium plasma will cause irreversible pollution to the resin, limiting its wide application
In addition, there is currently no report on an effective way to reuse waste resin, and the resin is completely incinerated as waste, resulting in a waste of resources
These problems limit the application of magnetic ion exchange resins and hinder their development.

Method used

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  • System and method for treating slightly alkaline secondary effluent through magnetic ion exchange resin coupled catalytic ozonation circulating reflux
  • System and method for treating slightly alkaline secondary effluent through magnetic ion exchange resin coupled catalytic ozonation circulating reflux
  • System and method for treating slightly alkaline secondary effluent through magnetic ion exchange resin coupled catalytic ozonation circulating reflux

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The slightly alkaline secondary effluent (pH=7~9) that meets the first-level A standard of "GB 18918-2002 Pollutant Discharge Standard for Urban Sewage Treatment Plants" is injected into the high-density resin mixing tank 1 through the water inlet 2, and the magnetic resin passes through The regenerated resin enters the high-density resin mixing pool 1 through the inlet 3, and the magnetic resin is stirred and mixed with the secondary effluent by the mechanical stirrer 4, and the secondary effluent is treated with the magnetic resin. The magnetic resin is a spherical magnetic acrylic anion resin with a diameter of 180 microns to 200 microns, the resin is chlorine type and hydroxide type, and the high-density resin mixing tank 1 is filled with a volume ratio of 60%, and the regeneration solution of the resin It is a mixed regeneration solution of sodium chloride and sodium hydroxide. When the resin needs to be regenerated or the waste resin is used to prepare a catalyst,...

Embodiment 2

[0042] The slightly alkaline secondary effluent (pH=7~9) that meets the first-level A standard of "GB 18918-2002 Pollutant Discharge Standard for Urban Sewage Treatment Plants" is injected into the high-density resin mixing tank 1 through the water inlet 2, and the magnetic resin passes through The regenerated resin enters the high-density resin mixing pool 1 through the inlet 3, and the magnetic resin is stirred and mixed with the secondary effluent by the mechanical stirrer 4, and the secondary effluent is treated with the magnetic resin. The magnetic resin is a spherical magnetic acrylic anion resin and a magnetic acrylic cation resin with a diameter of 100 microns to 200 microns, the resins are sodium type, chlorine type and hydroxide radical type, and the filling volume ratio of the high-density resin mixing pool is 60%, the proportion of the two resins is 80% for anion and 20% for cation, and the regeneration liquid of the magnetic resin is a mixed regeneration liquid of ...

Embodiment 3

[0044]The slightly alkaline secondary effluent (pH=7~9) that meets the "GB 18918-2002 Pollutant Discharge Standard for Urban Sewage Treatment Plants" Class I B standard is injected into the high-density resin mixing tank 1 through the water inlet 2, and the magnetic resin passes through The regenerated resin enters the high-density resin mixing pool 1 through the inlet 3, and the magnetic resin is stirred and mixed with the secondary effluent by the mechanical stirrer 4, and the secondary effluent is treated with the magnetic resin. Described magnetic resin diameter is the spherical magnetic styrene series anion resin of 50 microns to 300 microns, magnetic acrylic series cationic resin and magnetic phenolic series amphoteric ion exchange resin, and magnetic resin is sodium type, chlorine type and hydroxide radical type, The filling volume ratio of the high-density resin mixing pool is 70%, the ratio of the three resins is 70% for anion, 20% for cation, and 10% for amphoteric io...

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Abstract

The invention discloses a system and a method for treating slightly alkaline secondary effluent through magnetic ion exchange resin coupled catalytic ozonation circulating reflux, and the system comprises a high-density resin mixing tank, a resin sedimentation tank and a catalytic ozonation tank, wherein the high-density resin mixing tank is provided with a water inlet, a regenerated resin inlet, a mechanical stirrer, an oxidized effluent backflow water inlet, a regenerated or waste resin outlet, a resin backflow inlet and a resin sedimentation tank connector; the resin sedimentation tank is provided with a resin backflow outlet, a first inclined tube sedimentation plate and an overflow weir; the catalytic ozonation tank is provided with a resin-based catalyst, a baffle plate, an ozone generator, an aeration device, a water outlet, an oxidation reflux water outlet and a second inclined tube precipitation plate. The magnetic resin technology and catalytic ozonation are organically combined from the perspective of system design and operation, the treatment efficiency is improved, the service life of the resin is prolonged, the cost is saved, the waste magnetic resin is recycled, and the water treatment amount is increased.

Description

Technical field [0001] The invention belongs to the technical field of water treatment, and relates to a system and method for magnetic ion exchange resin coupled catalytic ozone oxidation circulation reflux treatment of alkaline secondary effluent. Background technique [0002] With the development of economy and progress of society, water shortage has become a serious problem affecting human activities on a global scale. Our country is one of many water-scarce areas. The current situation of water shortage in our country is mainly manifested by uneven distribution of water resources and serious water pollution problems. Utilizing the secondary effluent from urban sewage plants and developing reclaimed water reuse is a good solution to the water shortage problem. However, there are many risk issues during the reuse of reclaimed water landscapes: such as eutrophication of water bodies caused by nitrogen and phosphorus, accumulation and biotoxicological effects caused by eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/42C02F2001/425C02F1/78C02F1/725C02F2001/007
Inventor 陈志强唐英才温沁雪
Owner HARBIN INST OF TECH
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