The concept of emission reduction goes deep into the operation and management of enterprises. Sewage treatment and wastewater utilization are one of the issues that need to be considered in the chemical industry. Through the analysis of wastewater recovery process, the energy utilization rate is greatly improved, the production cost of the enterprise is saved, the economic benefit of the enterprise is improved, and a broader idea is provided for the sustainable development of the industry.

Wastewater treatment technology in chlor alkali process

With the continuous development of science and technology and the continuous improvement of environmental protection awareness, people began to study wastewater treatment methods to improve the utilization rate of wastewater. Recycle and purify the wastewater. The extracted wastewater contains organic components, which can significantly improve the utilization efficiency of raw materials for factory production. However, enterprises should pay attention to the accuracy of extraction, accurately study the components contained in the wastewater, and pay attention to the accuracy and safety of extraction in the extraction process, so as to avoid potential safety hazards in the purification of wastewater and impurities contained in the extracted components. At the same time, enterprises should also pay attention to the accuracy and safety of equipment, and select appropriate water purification equipment; In addition, enterprises should also note that different types of wastewater have different treatment methods.

In the process of wastewater purification, appropriate water purification methods must be selected according to the nature of the substances contained in the wastewater and the matters needing attention.

1 Filter reverse flow water treatment

The basic principle of filter backwater treatment is to intercept suspended substances in the form of a filter. This requires one. Cellulose is applied to the filter element. The feed liquid is fully mixed by saline and other materials to help the body. The liquid is delivered to the filter of saline inlet pipe through the feed pump. The suspension will be fully filtered to achieve the purpose of filtering. At this time, pay attention to the pressure parameters of the filter. If the pressure difference is greater than 2kg, it is necessary to remove suspended solids in time to avoid affecting the filtering effect. Through the monitoring of its composition, it can be found that the unqualified water body is not suitable for sewage treatment. The water in the filter needs to be discharged to the neutralization tank for further treatment.

2 Cellulose adsorption method

Cellulose adsorption method is mainly divided into two steps: filtration and adsorption. First, professional sewage filtration equipment is used to filter sewage to remove suspended solids and large particles in water. Then, the method of water pollutant adsorption is used to fully mix specific applications and cellulose filtration tools with brine sewage of a certain concentration. The mixed solution is prepared by the input filtration device of the infusion pump for the seawater inlet pipe, Then the filtering device coated on cellulose will play a role in overall interception, and the final water content will achieve the purpose of water purification. In this process, it also plays a decisive role and the pressure difference generated by the liquid before and after filtering. To some extent, because the filter belt greatly affects the differential pressure filtering and filtering effect of the liquid before and after filtering (the maximum pressure difference in international rules is 2kg), it requires employees to recycle the cellulose adsorption materials, and then the next filter. At the same time of filtering, the operator should also be prepared to determine the chemical composition of the treated water. The purification indicators such as the still unqualified water should be further purified to ensure the safe entry of purified water into the natural environment.

3 Resin tower reaction method

The method of using the resin tower reaction should be to initially filter the wastewater and the water filtered by the resin tower to make it react with the canines and resins. The wastewater through a series of chemical reactions contains ion adsorption resin. After a few days, the purified water according to the stability test standard should be fused again before further reaction. However, the disadvantage of this method is that a small amount of sewage is produced after sewage purification each time, while the sewage produced by the acid and alkali of the resin tower of the reaction method is stronger, so it is necessary to neutralize the sewage treatment samples and then conduct purification treatment.

4 Electrolytic hydrogen method

First, the content is determined and the sewage is filtered. Then, the impurities are removed through the adsorption of electrodes on both sides of the electrolysis. During the electrolysis process, a large amount of hydrogen and water vapor will be generated. Hydrogen will enter the washing tower. The impurities containing hydrogen and other small particles in the alkali mist can be removed through the "low humidity spray". The purified hydrogen will be used as a container. After the electrolytic electrolyte is further treated, it will enter the underground pool to increase the amount of groundwater, Improve soil wetness.

5 High purity acid water flow pump drainage treatment

For water treatment, the high-purity acid used by most chemical enterprises in China is high-purity hydrochloric acid produced by graphite three-way furnace formed by hydrogen chloride gas cooling and contacting with dilute acid. The waste gas will contact with the pure water at the bottom to form a secondary furnace, which will combine with hydrogen chloride gas to form hydrochloric acid. Some unabsorbed gas will be discharged from the tower top. The iron method is used to synthesize hydrochloric acid synthesis furnace. Using the same underground water, more pure acid can be discharged. The absorption part of hydrochloric acid in the water will completely absorb the acid, which has two advantages. First, salt water can be added. Second, to save the use of steam, greatly improve the use efficiency and reduce the production cost.

6. Backwashing water treatment of pure water iron remover

Except for the iron device, when the iron content reaches a certain index value, the device will carry out backwashing treatment. The backwashing water enters from the bottom and overflows from the top to completely remove the rust in the quartz sand. It is not feasible to treat salt sludge by mixing water with neutralization tank, which will lead to chemical reaction between iron and acid water. Therefore, it is necessary to discharge it directly into the sewage treatment to meet the discharge standard.

7 Pure water ion exchange resin regeneration water treatment

The water treatment of pure water ion exchange resin is an important link. It is mainly composed of three main generators, including weak acid hydrogen ion exchange tower and anion double chamber ion exchanger. The regeneration water mainly refers to the regeneration and conversion of water in weak acid bed and poplar bed, washing water and anion double chambers. At the same time, the water is neutralized and the PH value should be adjusted above 7.

8 Secondary steam condensate treatment

Part of the condensed water of the solid caustic soda used by chlor alkali enterprises is recycled, and then heat is exchanged through the underground water. The cooled condensate heat exchanger can be used as a child, while the fresh water after heat exchange of the underground water causes a lot of waste. After the transformation, the equipment can directly transfer these hot salts. This has two advantages. First, salt water can be added, and second, in order to save the use of steam, the efficiency is greatly improved, The production cost is reduced.