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Method for treating reverse osmosis concentrated water and circulating wastewater by whole membrane method

A technology of reverse osmosis concentrated water and circulating sewage, which is applied in the fields of filtration treatment, water/sewage treatment, chemical instruments and methods, etc. It can solve the problems of reducing the hardness of wastewater and reducing the salt content of wastewater, so as to reduce the amount of residual wastewater, The effect of saving electricity costs and increasing the concentration factor

Active Publication Date: 2015-05-13
山东泰禾环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to minimize the hardness in the waste water, reduce the salt content of the waste water, and separate the monovalent ions and divalent ions in the water. Removal, monovalent ions are removed by membrane concentration, so that the concentration of wastewater is more than twice that of traditional methods, the amount of remaining wastewater is reduced by half, and the overall investment and operating costs can be saved by half

Method used

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  • Method for treating reverse osmosis concentrated water and circulating wastewater by whole membrane method
  • Method for treating reverse osmosis concentrated water and circulating wastewater by whole membrane method

Examples

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Embodiment 1

[0025] Such as figure 1 As shown, firstly, the waste water with a salt content of 5000ppm flows into the regulating tank 1, and is transported by the raw water pump 2, and sodium hydroxide and sodium carbonate are added by the first alkali-adding pump 3 and the second alkali-adding pump 4, and after reaching the reaction tank 5 Stir and react for 30 minutes to form calcium carbonate and magnesium hydroxide crystals. The mixed solution flows to the membrane tank 6 equipped with a flat ceramic membrane and is filtered through a flat ceramic membrane device 7. The calcium carbonate and magnesium hydroxide crystals in the water are trapped in the membrane. After reaching a certain concentration, it is discharged into the sludge tank and used for plate and frame filter. The permeate filtered by the flat ceramic membrane device 7 is sucked by the suction pump 8 and sent to the water production tank 9, pressurized by the first-stage booster pump 10, added acid by the acid pump 11 to ...

Embodiment 2

[0027] Such as figure 2 As shown, firstly, the waste water with a salt content of 5000ppm flows into the regulating tank 1, and is transported by the raw water pump 2, and sodium hydroxide and sodium carbonate are added by the first alkali-adding pump 3 and the second alkali-adding pump 4, and after reaching the reaction tank 5 Stir and react for 30 minutes to form calcium carbonate and magnesium hydroxide crystals. The mixed solution flows to the temporary storage pool 6-1 by itself, and is pressurized by the first booster pump 7-1 to enter the tubular ceramic membrane device 8-1 for filtration. Calcium carbonate and magnesium hydroxide crystals are intercepted by ceramic membranes, and the concentrated solution is discharged into the sludge tank for plate and frame pressure filtration. The permeate filtered by the tubular ceramic membrane device 8-1 flows into the water production tank 9, is pressurized by the first-stage booster pump 10, and is added with acid by the acid ...

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Abstract

The invention discloses a method for treating reverse osmosis concentrated water and circulating wastewater by a whole membrane method, and belongs to the technical field of wastewater treatment and reclaimed water reuse. The method disclosed by the invention comprises the following steps: regulating the water amount and the water quality of wastewater by using a regulating tank; adding alkali to react with magnesium and calcium ions in a reaction tank to generate crystals of magnesium hydroxide and calcium carbonate; adding a mixed solution into a ceramic membrane filtering device; after the crystals of the magnesium hydroxide and calcium carbonate are filtered by a ceramic membrane, performing filter-pressing processing on a concentrated solution by using a plate frame; regulating the filtrate by adding an acid, and adding the regulated filtrate into a first-stage reverse osmosis device; recycling reverse osmosis pure water; adding the reverse osmosis pure water into a nano-filter; returning the concentrated water which is subjected to nano-filtration to the regulating tank; concentrating the water produced by the nano-filtration by using a second-stage reverse osmosis device; recycling the reverse osmosis produced water; further concentrating the concentrated water in a forward osmosis device; recycling the water produced by the forward osmosis; evaporating a trace amount of remaining concentrated water in an evaporator, and using the trace amount of remaining concentrated water in other ways, so as to finally realize zero emission of the wastewater.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating reverse osmosis concentrated water and circulating sewage by a full-membrane method. Background technique [0002] Reverse osmosis concentrated water and circulating sewage have high salt content and high hardness, making it difficult to reuse wastewater. The traditional method is to add alkali to react, then use clarifier or sedimentation tank for treatment, then filter with sand filter, and then go through ultrafiltration Or microfiltration, and then enter the reverse osmosis concentration treatment. The disadvantage of this method is that the crystals of magnesium hydroxide are small, suspended in water, and not easy to settle. Traditional clarification, sedimentation, and sand filtration are not effective for its filtration, and some magnesium hydroxide remains in the water, which makes the amount of subsequent acid addition large and increases the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/08
CPCC02F1/001C02F1/04C02F1/44C02F1/441C02F1/442C02F1/66C02F5/00C02F9/00
Inventor 房军贤
Owner 山东泰禾环保科技股份有限公司
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