Near zero emission process of salt-containing waste water

A salty wastewater, near-zero discharge technology, applied in adsorption water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high investment and operation cost, low water recovery rate, etc. , to achieve the effect of reducing the cost of water treatment per ton, increasing the discharge and high water recovery rate

Active Publication Date: 2013-10-09
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to propose a near-zero discharge process for saline wastewater in order to solve the problems of low water recovery rate and high investment and operation costs in the saline wastewater treatment process

Method used

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  • Near zero emission process of salt-containing waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Pulping tail water is reused as industrial circulating cooling water, the process flow chart is as follows figure 1 . The raw water quality before homogenization is TDS is 2684mg / L, COD Cr 90mg / L, SO 4 2- Concentration is 682mg / L, Cl - Concentration is 797mg / L, SS is 30mg / L, water inflow is 400m 3 / d. After homogenization, the water inflow is 419.4m 3 / d. After air flotation treatment, the water quality is TDS 2648mg / L, COD Cr 54mg / L, SO 4 2- Concentration is 682mg / L, Cl - The concentration is 797mg / L, and SS is 5mg / L. All the water produced by air flotation is oxidized, and a small amount of concentrated water enters the slag treatment process at the same time. After ozone oxidation and granular activated carbon filtration, the wastewater TDS is 2640mg / L, COD Cr 46mg / L, SO 4 2- Concentration is 682mg / L, Cl - The concentration is 797mg / L, Ca 2+ The concentration is 132mg / L, Mg 2+ The concentration is 15mg / L. 40% of the volume fraction of the ozone prod...

Embodiment 2

[0028] Advanced treatment and reuse of printing and dyeing wastewater, the process flow chart is as follows figure 1 . Raw water TDS is 1860mg / L, COD Cr 115mg / L, SO 4 2- Concentration is 306mg / L, Cl - Concentration is 559mg / L, water inflow is 2000m 3 / d. COD after air flotation Cr down to 75mg / L. The process produces concentrated water 22m 3 / d Return to the water inlet part for homogenization, and the concentrated water is discharged 2m 3 / d. COD after deep oxidation of potassium permanganate and filtration of powdered activated carbon Cr down to 60mg / L. After oxidation, 65% of the volume fraction of wastewater enters the electro-adsorption treatment, and the rest of the wastewater enters the ultrafiltration system for treatment. Ultrafiltration 1 and ultrafiltration 2 both use hollow fiber membranes with a membrane pore size of 10nm; the TDS of electro-adsorption produced water is 760mg / L, COD Cr 56mg / L, SO 4 2- The concentration is 102mg / L, Cl - Concentratio...

Embodiment 3

[0030] Deep purification of coal-to-oil saline wastewater, the process flow is as follows figure 1 . Raw water TDS is 4500mg / L, COD Cr 140mg / L, SO 4 2- The concentration is 910mg / L, Cl - Concentration is 1250mg / L, water inflow is 200m 3 / h. After air flotation, the water quality of the produced water is TDS 4400mg / L, COD Cr 77mg / L, SO 4 2- Concentration is 895mg / L, Cl - The concentration is 1190mg / L. The water produced by air flotation is oxidized by chlorine gas and then filtered by granular activated carbon. This part is mainly to reduce the COD of the influent water in the subsequent process. After oxidation, the COD Cr 30mg / L. All the oxidized water enters the ultrafiltration treatment. The water quality of the ultrafiltration process is 4300mg / L TDS and 4300mg / L COD Cr 26mg / L, SO 4 2- Concentration is 870mg / L, Cl - The concentration is 1220mg / L, and ultrafiltration 1 adopts a hollow fiber organic membrane with a membrane pore size of 20nm. The ultrafiltrat...

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Abstract

The invention relates to a near zero emission process of salt-containing waste water. The process specifically comprises the following steps of: 1) pretreatment, namely, removing part of COD (Chemical Oxygen Demand), suspended solids, hardness and the like from raw water; 2) electric absorption, namely, removing inorganic salt in pretreated partial water, wherein concentrated water generated in the process and part of oxidized waste water which is not subjected to electric adsorption treatment enter into a membrane filtering system together; 3) treatment in a membrane treatment system, wherein the membrane treatment system mainly comprises ultrafiltration, reverse osmosis and electroosmosis processes; and 4) evaporative crystallization and salty mud treatment process, namely, evaporating and crystallizing concentrated salty water generated by electroosmosis, wherein fresh water generated in the process enters into a water supply system while solids generated in the process enter into the salty mud treatment system. The comprehensive water recovery rate of the near zero emission process can reach 99.5%, so that resource and harmful treatment of the salt-containing waste water is realized.

Description

technical field [0001] The invention relates to a near-zero discharge process for saline wastewater, belonging to the technical field of saline wastewater treatment. Background technique [0002] The composition of saline wastewater is very complex, resulting in complex treatment processes and a huge annual discharge. Taking paper pulping tail water as an example, it is a kind of difficult-to-treat organic saline wastewater with large water volume, high chroma, large suspended solids content, high organic matter concentration and complex components. Therefore, there is an urgent need to develop a reuse technology suitable for this type of high-salt wastewater [0003] According to the requirements of reclaimed water, different treatment methods or combinations of different processes are adopted, and various sewage treatment methods are combined to obtain qualified reclaimed water, which is used in cooling circulating water, boiler feed water and other industrial water. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/28C02F1/44C02F1/469
Inventor 杨刚邢卫红李辉李卫星徐南平
Owner NANJING UNIV OF TECH
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