Electrodialyzer and near-zero-release industrial wastewater recycling technique

A technology of electrodialyzer and industrial wastewater, which is applied in electrodialysis, general water supply saving, chemical instruments and methods, etc., and can solve the problems of high treatment cost and low recovery rate of wastewater

Active Publication Date: 2014-04-16
BEIJING JINGRUN NEW TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose an electrodialyzer and a near-zero discharge industrial wastewater reuse process for the problems of low wastewater recovery rate and high treatment cost in the prior art

Method used

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  • Electrodialyzer and near-zero-release industrial wastewater recycling technique
  • Electrodialyzer and near-zero-release industrial wastewater recycling technique
  • Electrodialyzer and near-zero-release industrial wastewater recycling technique

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specific Embodiment 1

[0056] The wastewater of a power plant is the mixed sewage of circulating water discharge sewage, standard sewage and RO concentrated water. The total hardness of mixed sewage is 2009mg / L (CaCO 3 meter), the total alkalinity is 444mg / L (CaCO 3 Meter), the conductivity is 2790uS / cm, the turbidity is 1.51NTU, SiO 2 The content is 16.8mg / L. Due to the high hardness, turbidity, and salt content of the mixed sewage, it is difficult to process it and reuse it in the plant's circulating water system while ensuring a high water recovery rate.

[0057] By analyzing the water quality of mixed sewage, the near-zero discharge industrial wastewater reuse process provided by the present invention is adopted, that is, the integrated device is firstly used to conduct comprehensive functions such as electrocoagulation, air flotation, high-efficiency sedimentation and multi-media filtration on the sewage, effectively Reduce hardness, turbidity and other indicators in water.

[0058] The ele...

Embodiment 2

[0063] The TDS of fracturing wastewater in an oilfield is 7012mg / L, the TSS is 482mg / L, and the turbidity is 280NTU. Part of the produced water is required to be reused, and the TDS of the recycled water is <350mg / L; the other part is reinjected, and the TDS of the reinjected water is <2100mg / L. The concentrated water produced requires a salt content of more than 100,000 mg / L and is sent to the evaporation plant for treatment.

[0064] By analyzing the water quality of mixed sewage, the near-zero discharge industrial wastewater reuse process provided by the present invention is adopted, that is, the integrated device is firstly used to conduct comprehensive functions such as electrocoagulation, air flotation, high-efficiency sedimentation and multi-media filtration on the sewage, effectively Reduce suspended solids and turbidity indicators in water.

[0065] The present invention uses reverse osmosis equipment to desalinate part of the integrated water produced. The fresh wa...

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Abstract

The invention relates to an electrodialyzer and a near-zero-release industrial wastewater recycling technique. The electrodialyzer is arranged vertically; the electrodialyzer is in an asymmetrical water inlet-outlet channel structure, and the water inlet channel is more narrow than the water outlet channel; the cation-exchange membrane adopts a univalent ion exchange membrane, and the anion-exchange membrane adopts a general-purpose ion exchange membrane; and the negative plate and positive plate of the electrodialyzer adopt noble-metal-coated titanium base electrodes. The technique comprises the following steps: carrying out electric flocculation treatment on industrial wastewater, carrying out electrolysis and flocculation reaction under the actions of an electric field and air floatation, and pretreating the industrial wastewater by precipitation and filtration; directly recycling fresh water by an ultrafiltration+reverse osmosis combined technique; and carrying out deep concentration on concentrated water by using the electrodialyzer, recycling the produced fresh water, and sending the concentrated water into an evaporation crystallizer to perform evaporation crystallization. The technique is mainly used for treating circulating water sewage, satisfactory sewage, primary reverse osmosis concentrated water and other types of industrial sewage.

Description

technical field [0001] The invention relates to the technical field of wastewater reuse, in particular to an electrodialyzer and a near-zero-discharge industrial wastewater reuse process. The main content of the invention is to combine pretreatment and desalination processes to improve the water recovery rate of the industrial wastewater reuse process. Background technique [0002] Industrial wastewater refers to the wastewater containing a large amount of organic and inorganic salts produced in the production process of industrial and mining enterprises. With the increasing degree of industrialization, the discharge of industrial water and wastewater is increasing, and the harm to the ecological environment is more serious. At the same time, severe water shortage in some areas has become a constraint on the sustainable development of social economy. In order to further strengthen industrial water-saving work, alleviate the contradiction between supply and demand of water r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469B01D61/46C02F9/10C02F9/06
CPCY02A20/124Y02A20/131
Inventor 肖东
Owner BEIJING JINGRUN NEW TECH DEV
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