The chlor alkali industry is a basic chemical raw material industry that occupies an important position in the national economy. Its main products, caustic soda, chlorine gas, and hydrogen gas, are widely used in various sectors of the national economy, such as light industry, chemical industry, prevention, building materials, agriculture, electronics, national defense, military industry, metallurgy, and food processing. Among the basic chemical raw materials of three acids and two bases, the chlor alkali industry occupies two types: caustic soda and hydrochloric acid. The main raw materials are mercury containing and non mercury containing raw salts. The generated waste includes coal ash, waste carbide slag, waste salt sludge, mercury containing waste activated carbon, adsorber activated carbon and waste catalyst, water treatment waste sludge, salt sludge wastewater, and exhaust gas. Direct discharge will have a significant adverse impact on the environment.
Wastewater from the non-ferrous metallurgical industry is generated during the wet smelting process of various non-ferrous metals such as copper, zinc, lead, gold, silver, etc. Wastewater contains high concentrations of metal ions and is not allowed to be discharged. Its composition is complex and variable, making it difficult to treat industrial wastewater. It is one of the main wastewater that pollutes the environment and should be recycled as much as possible. The final discharged wastewater must undergo coagulation and flotation treatment before reaching the discharge standards.
With the development of China's pharmaceutical industry, the treatment of pharmaceutical wastewater is receiving increasing attention. As long as the wastewater generated by the industry contains a large amount of toxic organic compounds, such as side chain lipids, petroleum ether, acetone, methanol, ethanol, dichloromethane, toluene, and various acid and alkali substances, as well as residues of cephalosporin antibiotics. This type of wastewater has complex components, high organic content, high molecular weight, and strong inhibitory effects of toxic substances and antibiotics on biochemical treatment bacteria. It is currently one of the most difficult to treat wastewater.
As a major water user, chemical plants typically use millions of cubic meters of fresh water annually, resulting in low water reuse rates. At the same time, they discharge millions of cubic meters of wastewater, which not only wastes a large amount of water resources but also causes environmental pollution. Moreover, the shortage of water resources has posed a threat to the production of these industrial water users. To maintain the sustainable development of the enterprise, reduce water resource waste, reduce production costs, and improve the economic and social benefits of the enterprise. Advanced treatment (tertiary treatment) is required for chemical wastewater as a supplement to circulating water or power desalination water to achieve wastewater reuse.
At present, in the steel industry, where energy consumption accounts for 10% of the total energy consumption, water consumption accounts for about 9%. The main sources of wastewater generated by the steel industry are: slag flushing wastewater, wastewater generated from purifying flue gas, wastewater generated from cooling equipment, and wastewater from flushing sites. According to different production processes, the quality of wastewater also varies, and the quality of wastewater discharged from the same process at different stages also varies greatly. The pollution caused by these wastewater mainly includes chemical poison pollution, acid pollution, thermal pollution, organic oxygen demand pollution, solid suspended solids pollution, etc., with a very wide range of pollution. The discharge of wastewater from the steel industry is mostly alkaline and has a certain viscosity, making wastewater treatment difficult.
As a high energy consuming industry, the coal industry consumes resources and pollutes the environment to a high extent. The wastewater it discharges contains a large amount of harmful and toxic substances such as ammonia nitrogen, phenol, oil, cyanide, etc. The disorderly discharge of wastewater from coal enterprises has already endangered the quality of groundwater. If we do not increase the efforts to treat wastewater from coal enterprises, it may cause serious harm to society and people's living environment, This exacerbates the contradiction between water supply and demand.
Some mine water contains radioactive pollutants, which are discharged into the natural environment and cause varying degrees of damage to agricultural, land, and forest resources. The high-efficiency, energy-saving, and fast pulling filter press developed by Sudong is mainly aimed at the characteristics of large wastewater treatment capacity and fast filtration speed in the mining industry, greatly saving cycle time and improving filtration efficiency.
In the daily production work of petrochemical enterprises, the large amount of oily wastewater discharged is a special and difficult to treat pollutant, and its treatment is a very important task. In the petroleum industry, the macromolecular petroleum pollutants contained in wastewater are difficult to degrade substances and high concentrations of dissolved salts. If not treated properly, it can have adverse effects on the growth of microorganisms, ultimately affecting ecological balance and causing irreversible losses to nature.
With the large-scale construction of urban sewage treatment plants in China, the sludge generated has become a new source of environmental pollution. These sludge have high moisture content and other issues, so deep dehydration of these sludge has become one of the key research topics. Research has found that after chemical modification of urban sludge, deep dehydration treatment using a filter press can form sludge filter cakes with low moisture content, achieving sludge reduction.
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