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Apparatus for eliminating all hardness in reverse osmosis concentrated water

A reverse osmosis concentrated water and hardness technology, which is applied in the field of sewage treatment, can solve the problems of increasing difficulty in crystallization separation, reducing concentrated liquid discharge, and high cost of sodium carbonate, and achieves the effects of saving chemical costs, eliminating residual hardness, and eliminating temporary hardness

Pending Publication Date: 2019-04-05
GREENTECH ENVIRONMENTAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods did not make good use of the reverse osmosis concentrated water, did not fundamentally reduce the discharge of the concentrate, and caused a waste of water resources
[0003] In particular, for the treatment of concentrated brine with high sulfate concentration, calcium ion concentration and sodium ion concentration in water, there are currently three problems: one is that the highly concentrated brine contains scale inhibitors, which makes crystallization and separation Difficulty increases; the second is for concentrated brine with high sulfate content, the general treatment method is to convert permanent hardness (calcium sulfate) into temporary hardness (calcium carbonate), but the cost of newly introduced sodium carbonate is higher; the third is because The concentration of sodium ions is high, limited by the adsorption equation, the remaining hardness cannot be replaced by a sodium ion exchanger

Method used

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  • Apparatus for eliminating all hardness in reverse osmosis concentrated water
  • Apparatus for eliminating all hardness in reverse osmosis concentrated water

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Embodiment 1

[0025] Such as figure 1 As shown, the present invention proposes a device for removing all hardness in reverse osmosis concentrated water, including a permanent hardness elimination unit 1 , a temporary hardness elimination unit 2 and a residual hardness elimination unit 3 . The permanent hardness elimination unit 1 includes a crystallizer 101, a thickener 102 and a centrifugal dehydrator 103, the inlet of the crystallizer 101 is connected with the concentrated brine input pipeline, and the inlet of the crystallizer 101 is also connected with the addition of flocculant and seed crystal. The medicine box 104 is connected, the crystal slurry outlet of the crystallizer 101 is connected with the inlet of the thickener 102 , and the outlet of the thickener 102 is connected with the inlet of the centrifugal dehydrator 103 . Temporary hardness elimination unit 2 includes quicklime reaction tank 201, coagulation sedimentation tank 202, flocculation sedimentation tank 203 and sedimenta...

Embodiment 2

[0036] The difference between this embodiment and the first embodiment is that the remaining hardness elimination unit 3 also includes a multimedia filter 304, the water outlet of the sedimentation tank 204 is connected with the inlet of the multimedia filter 304, and the outlet of the multimedia filter 304 is connected with the multimedia filter 304. The inlet of the chelating resin filter 301 is connected, and the outlet of the chelating resin filter 301 is connected to the drainage pipeline. The rest of the settings are the same as the previous embodiment. The multimedia filter 304 can remove micro-suspended substances in the water, thereby avoiding pollution to the resin.

[0037] In addition, the backwash wastewater of the multimedia filter 304 and the acid-containing wastewater of the chelating resin filter 301 can be introduced into the quicklime reaction tank 201 through the waste water pipe, so that the backwash wastewater can be utilized again.

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Abstract

The invention relates to an apparatus for eliminating all hardness in reverse osmosis concentrated water. The apparatus comprises a permanent hardness elimination unit, a temporary hardness elimination unit and a surplus hardness elimination unit; the permanent hardness elimination unit comprises a crystallizer, a thickener, and a centrifugal dehydration machine, an inlet of the crystallizer is connected with a concentrated salt water input pipeline, an inlet of the crystallizer is also connected with a dosing box with a flocculating agent and seed crystal, a crystal slurry outlet of the crystallizer is connected with an inlet of the thickener, and a material outlet of the thickener is connected with an inlet of the centrifugal dehydration machine; the temporary hardness elimination unit comprises a quicklime reaction tank, a coagulation sedimentation tank, a flocculating sedimentation tank and a sedimentation tank which are successively connected with one another; and the surplus hardness elimination unit comprises a chelating resin filter, a water outlet of the sedimentation tank is connected with an inlet of the chelating resin filter, and an outlet of the chelating resin filteris connected with a water discharging pipeline.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a device for removing all hardness in reverse osmosis concentrated water. Background technique [0002] Reverse osmosis membranes are widely used in sewage regeneration and zero discharge projects because of their high treatment efficiency, good effluent quality, and simple operation. However, the water production rate of reverse osmosis can only reach about 75%, and the treatment of concentrated reverse osmosis water is a technical and economic problem. If the concentrated water is directly discharged into the environment, its highly concentrated brine will have a serious impact on the ecological environment and cause a waste of water resources. The treatment methods of reverse osmosis concentrated water mainly include surface water discharge, deep well injection, sprinkler irrigation, thermal evaporation, etc. However, the above methods have failed to mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/5236C02F1/42C02F1/38C02F2301/08C02F2001/5218
Inventor 黎泽华张巧云张和兴韩慧铭刘渊苏英强
Owner GREENTECH ENVIRONMENTAL CO LTD