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Novel process for resource recycling of acid and alkali from high-salinity and high-hardness wastewater

A technology for recovering acid, alkali and high hardness, applied in water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc. Scaling and other problems, to achieve significant environmental and economic benefits

Inactive Publication Date: 2019-01-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the recycling rate of wastewater by the reverse osmosis membrane method can only reach about 75%, and there are still 25% of concentrated water that cannot be used and needs to be discharged directly
Second, the surface of the reverse osmosis membrane is prone to fouling, resulting in increased separation difficulty and a gradual increase in energy consumption and maintenance costs

Method used

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  • Novel process for resource recycling of acid and alkali from high-salinity and high-hardness wastewater
  • Novel process for resource recycling of acid and alkali from high-salinity and high-hardness wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0024] See attached figure 1 with attached figure 2 , technical scheme of the present invention comprises the following steps:

[0025] (1) The content of calcium ions in the high-salt and high-hardness wastewater used in the embodiment of the present invention is 2189 ppm, the content of magnesium ions is 1523 ppm, and the content of sodium ions is 2211 ppm. Pass the collected wastewater through the pressure membrane device, the ceramic membrane pore size is 20nm, the pressure used is between 2.0-6.0MPa, the flow rate is controlled at about 40L / h, and the suspended particles in the produced water are below 1ppm.

[0026] (2) Pass 20L of clarified waste water gained in step (1) into a 500mL CH-93 type cation exchange resin column, adjust the peristaltic pump flow rate 10BV / h, react for 4h, and take a sample to detect that the calcium ion content in the effluent is 65.67 ppm, the magnesium ion content is 30.46ppm, the calcium ion removal rate is 97%, and the magnesium ion re...

Embodiment 2

[0030] The operation of step (1), (2) and (4) is the same as embodiment 1, and the difference between step (3) and embodiment 1 is only: the membrane stack of each unit electrodialysis is composed of FBM / AHA / CMB / FBM, Adjust the voltage to 15V and react for 60 minutes. The acid chamber generates 5.90% hydrochloric acid, and the alkali chamber produces 4.80% sodium hydroxide solution. The current efficiency is 57.09%, and the energy consumption is 3.09kWh / kg.

Embodiment 3

[0032] The operation of step (1), (2) and (4) is the same as embodiment 1, and the difference between step (3) and embodiment 1 is only: the membrane stack of each unit electrodialysis is composed of FBM / AHA / CMB / FBM, Adjust the voltage to 20V and react for 50 minutes. The acid chamber generates 6.20% hydrochloric acid, and the alkali chamber produces 5.20% sodium hydroxide solution. The current efficiency is 60.43%, and the energy consumption is 3.47kWh / kg.

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Abstract

The invention relates to a process for the resource recycling of acid and alkali from high-salinity and high-hardness wastewater. The process comprises the following steps: (1) pre-treating the high-salinity and high-hardness wastewater by virtue of a pressure film device to remove suspended solids in the wastewater until the suspended solids are lower than 1ppm; (2) introducing clarified wastewater pretreated in the step (1) into a cation exchange resin column, so as to decrease the hardness; (3) adjusting the pH value of the wastewater treated in the step (2) to be neutral, adding the wastewater into double-electrode film electroosmosis equipment, and preparing acid and alkali, so as to obtain products, namely sodium hydroxide and hydrochloric acid; and (4) diluting partial hydrochloricacid obtained in the step (3) into the cation exchange resin column, regenerating cation exchange resin, and simultaneously evaporating and concentrating eluant for crystlization, so as to obtain calcium chloride crystals and magnesium chloride crystals. The process is pollution-free in the whole process, the recovery rates of products, namely acid and alkali are high, and the wastewater treatmentcost is greatly lowered.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a new process for recycling acid and alkali from waste water with high salinity and high hardness. Background technique [0002] At present, my country has resolutely declared war on environmental pollution, successively implemented three major action plans for the prevention and control of air, water and soil pollution, and solved a number of major environmental problems. On the whole, the quality of the ecological environment continues to improve, showing steady progress, but the results are not stable. The ecological system is fragile, and the ecological environment with heavy pollution, heavy losses and high risks has not been fundamentally reversed. It is very difficult to treat the high-salt wastewater discharged from the papermaking and printing and dyeing industries, especially the high-hardness wastewater. Under the new policy, this part of wastewater is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/42C02F1/44C02F1/4693C02F1/66C02F9/00C02F2001/425
Inventor 沈江南裘洋波阮慧敏伍其辉
Owner ZHEJIANG UNIV OF TECH
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