CN-118359328-B - Advanced treatment system and treatment method for chemical high-salt wastewater

CN118359328BCN 118359328 BCN118359328 BCN 118359328BCN-118359328-B

Abstract

The invention discloses a chemical industry high-salt wastewater advanced treatment system and a treatment method, and belongs to the technical field of wastewater treatment. The invention uses an aeration micro-electrolytic cell and an oxidation cell to strengthen the degradation of organic pollutants, reduce the organic load of the post-device, and facilitate the improvement of the degradation efficiency of the post-device on pollutants in wastewater, and the post-electrodialysis device strengthens the removal of the organic pollutants in wastewater, and simultaneously acid and alkali generated in the electrodialysis process can synchronously remove residual anions introduced by the front-end process, thereby effectively solving the problem of large treatment capacity or secondary pollution of the post-sludge caused by the addition of an oxidant.

Inventors

ZHOU WENDONG
HUANG MUKAI
XIA WENJING
GAN SHIWEI
LI XIAOQIANG
XIE YONGXIN
LUO HUAIQING
CHEN YICHENG
XU BO

Assignees

广州市环境保护工程设计院有限公司

Dates

Publication Date: 20260508
Application Date: 20240314

Claims (9)

1. The chemical industry high-salt wastewater advanced treatment system is characterized by comprising an aeration micro-electrolysis tank, an oxidation tank, an electrodialysis device and a bacteria algae biochemical tank, wherein a micro-electrolysis filler layer and a first aeration device are arranged in the aeration micro-electrolysis tank, a water inlet of the aeration micro-electrolysis tank is positioned above the micro-electrolysis filler layer, a water outlet of the first aeration device and the aeration micro-electrolysis tank is positioned below the micro-electrolysis filler layer, and a water outlet of the aeration micro-electrolysis tank is connected with a water inlet of the oxidation tank through a pipeline; an ultraviolet lamp tube assembly is arranged in the oxidation pond, the ultraviolet lamp tube assembly is positioned between a water inlet of the oxidation pond and a water outlet of the oxidation pond, and the water outlet of the oxidation pond is connected with the electrodialysis device through a pipeline; the waste water outlet of the electrodialysis device is connected with the water inlet of the bacteria-algae biochemical tank through a pipeline, the bacteria-algae biochemical tank is provided with a bacteria-algae biochemical region, the bacteria-algae biochemical region is sequentially provided with a suspended bacteria-algae particle sludge layer, a interception net and a second aeration device from top to bottom, the water inlet of the bacteria-algae biochemical tank is positioned above the suspended bacteria-algae particle sludge layer, and the water outlet of the bacteria-algae biochemical tank is positioned below the interception net; The oxidation tank is provided with a dosing device, and the dosing device is used for dosing an oxidant to the oxidation tank, wherein the oxidant comprises at least one of potassium perchlorate and potassium permanganate; The bacteria and algae biochemical pond is provided with a constant temperature illumination system; the suspended algae granule sludge layer is formed by suspending algae granule sludge in wastewater; The preparation method of the bacterial algae granular sludge comprises the following steps of sequentially inoculating activated sludge and algin into water, adding a carbon source, mixing, culturing for 60-90 days under the condition of illumination to obtain bacterial algae granular sludge suspended in the water, wherein the carbon source is formed by compounding glucose and anhydrous sodium acetate according to the mass ratio of (5-10): 1, the ratio of the mass of the carbon source to the volume of the water is 3-8g/L, the ratio of the mass of the activated sludge to the volume of the water is 15-20g/L, and the volume ratio of the algin to the volume of the water is 4-7mL/L.
2. The advanced treatment system of high-salt wastewater in chemical industry as claimed in claim 1, wherein the micro-electrolysis filler layer comprises two layers of screens, and cinder micro-electrolysis balls are arranged between the two layers of screens.
3. The chemical industry high-salt wastewater advanced treatment system of claim 1, wherein the electrodialysis device comprises an electrodialysis pool, a first bipolar membrane, an anion exchange membrane, a cation exchange membrane and a second bipolar membrane are sequentially arranged in the electrodialysis pool, the first bipolar membrane, the anion exchange membrane, the cation exchange membrane and the second bipolar membrane are sequentially arranged in the electrodialysis pool, an anode region, an acid-producing region, a wastewater region, an alkaline water region and a cathode region, an acid liquor collecting tank is communicated with the lower part of the acid-producing region, a wastewater collecting tank is communicated with the lower part of the wastewater region, an alkali liquor collecting tank is communicated with the lower part of the alkaline water region, a first electrode is arranged in the anode region, a second electrode is arranged in the cathode region, the first electrode is connected with the anode of a power supply through a wire, the second electrode is connected with the cathode of the power supply through a wire, a water inlet of the electrodialysis device is arranged at the upper part of the wastewater region, and a water outlet of the electrodialysis device is arranged at the bottom of the wastewater collecting tank.
4. The chemical high-salinity wastewater advanced treatment system according to claim 3, wherein the first bipolar membrane comprises an anion exchange layer, a transition layer and a cation exchange layer which are sequentially stacked, the anion exchange layer of the first bipolar membrane faces the anode region, and the cation exchange layer of the first bipolar membrane faces the acid-producing region.
5. The chemical high-salt wastewater advanced treatment system as claimed in claim 3, wherein the second bipolar membrane has the same structure as the first bipolar membrane, an anion exchange layer of the second bipolar membrane faces the alkaline water region, and a cation exchange layer of the second bipolar membrane faces the cathode region.
6. A chemical high-salt wastewater advanced treatment method, which is implemented by the chemical high-salt wastewater advanced treatment system according to any one of claims 1 to 5.
7. The advanced treatment method for chemical high-salt wastewater as claimed in claim 6, comprising the following steps: s1, introducing wastewater into an aeration micro-electrolysis cell for aeration micro-electrolysis treatment; S2, inputting the wastewater treated in the step S1 into an oxidation pond for photocatalytic oxidation treatment; S3, inputting the wastewater treated in the step S2 into an electrodialysis device for electrodialysis treatment; s4, inputting the wastewater treated in the step S3 into a bacteria algae biochemical pond for degradation treatment, and then discharging.
8. The advanced treatment method of chemical high-salt wastewater according to claim 7, wherein the step S2 further comprises adding an oxidant in the photocatalytic treatment process, wherein the addition amount of the oxidant is 2-4g/L.
9. The advanced treatment method of chemical high-salt wastewater according to claim 7, wherein in the step S3, the electrodialysis treatment is performed at a voltage of 30-40V, a current of 4-5A and a time of 40-80min.

Description

Advanced treatment system and treatment method for chemical high-salt wastewater Technical Field The invention relates to the technical field of wastewater treatment, in particular to a chemical industry high-salt wastewater advanced treatment system and a chemical industry high-salt wastewater advanced treatment method. Background High-salt wastewater generally refers to wastewater having a total salt content of not less than 3.5 wt%. The generation of high-salt wastewater containing various pollutants such as salt, oil, organic heavy metals and radioactive substances is very wide, such as chemical plants and petroleum and natural gas collection processing plants. With the continuous development of industrial production, the discharge amount of high-salt wastewater is increased year by year. Therefore, high-salt wastewater treatment is important in wastewater treatment, and is an important point and a difficult point of wastewater treatment research. The high-salt wastewater treatment studied and commonly used at present mainly has the limitations of high treatment cost by a physicochemical method, large occupied area by a biological method and the like. For example, the invention patent with publication number CN111252889A discloses a high-salt wastewater treatment device and method combining a fungus-algae symbiotic method and a membrane biological membrane reactor, the device comprises the membrane biological membrane reactor, a gas separation membrane, a fungus-algae symbiotic biological membrane and a light source, wherein the membrane biological membrane reactor is a cavity made of transparent materials, an air inlet pipe and an air outlet pipe are respectively arranged at the top of the cavity, an air inlet pipe and an air outlet pipe are respectively arranged at the bottom of the cavity, a gas separation membrane pouring membrane forming assembly is arranged in the cavity, the two ends of the membrane assembly are respectively connected with the air inlet pipe and the air outlet pipe, the fungus-algae symbiotic biological membrane grows on the surface of the gas separation membrane, the light source is arranged outside the cavity and is used for uniformly irradiating the membrane biological membrane reactor, the device mainly depends on a composite membrane system, the membrane pollution problem easily occurs in the wastewater treatment process, the maintenance cost is high, the high-salt wastewater is directly utilized to enter the membrane biological membrane reactor without pretreatment, the high-salt wastewater salinity seriously influences the activity of the fungus-algae, and the treatment efficiency of pollutants in the high-salt wastewater is low. Therefore, finding a more efficient and rapid high-salt wastewater treatment technology becomes a problem to be solved urgently. Disclosure of Invention Based on the defects existing in the prior art, the invention aims to provide a chemical industry high-salt wastewater advanced treatment system and a chemical industry high-salt wastewater advanced treatment method. In order to achieve the above purpose, the invention adopts the following technical scheme: According to the chemical industry high-salt wastewater advanced treatment system, an aeration micro-electrolysis tank, an oxidation tank, an electrodialysis device and a bacteria algae biochemical tank are arranged in the aeration micro-electrolysis tank, a micro-electrolysis filler layer and a first aeration device are arranged in the aeration micro-electrolysis tank, a water inlet of the aeration micro-electrolysis tank is arranged above the micro-electrolysis filler layer, a water outlet of the first aeration device and a water outlet of the aeration micro-electrolysis tank are arranged below the micro-electrolysis filler layer, the water outlet of the aeration micro-electrolysis tank is connected with a water inlet of the oxidation tank through a pipeline, an ultraviolet lamp tube assembly is arranged in the oxidation tank, the ultraviolet lamp tube assembly is arranged between the water inlet of the oxidation tank and the water outlet of the oxidation tank, the water outlet of the electrodialysis device is connected with the water inlet of the bacteria algae biochemical tank through a pipeline, the bacteria algae biochemical tank is provided with a suspended bacteria algae particle sludge layer, a interception net and a second device, and the water inlet of the aeration micro-algae biochemical tank is arranged above the suspended bacteria algae particle sludge layer in sequence. The invention adopts an aeration micro-electrolysis tank, an oxidation tank, an electrodialysis device and a bacteria and algae biochemical tank which are sequentially connected, thereby leading a micro-electrolysis and two-stage oxidation process, a post electrodialysis process and a bacteria and algae biochemical degradation process. The invention firstly utilizes the aeration micro-electrolysis cell and the oxi