High-salt Organic Wastewater Treatment --- Process Technology

Hazards of high-salt organic wastewater

At present, the discharge of saline wastewater brings very serious environmental pollution, especially industrial saline organic wastewater, which not only contains high concentration of salt, but also contains a large amount of toxic and difficult to degrade organic matter, which is extremely harmful to the environment.

As one of the oldest industries in the world, leather making produces wastewater with extremely high salinity. According to statistics, the leather industry discharges nearly 100 million tons of wastewater each year, accounting for about 0.3% of the country's total industrial wastewater discharge. Leather wastewater contains inorganic salts such as chromium, sulfide, chloride, etc., and its content varies greatly with different work sections, processes and procedures. Excessive salt content can easily inhibit the activity of microorganisms, making conventional biochemical treatment processes extremely difficult.

Process technology of Shangchen Environmental

Shangchen Environment uses its own highly efficient composite bacterial strains to provide massive active microorganisms to treat this type of high-salt organic wastewater. The addition of corresponding high-efficiency composite bacteria contains abundant salt-tolerant active microorganisms, which provides the system with sufficient bacterial flora for biological expansion, completes biodegradation and system biochemical startup, increases the number of dominant bacterial flora per unit area, and improves volumetric load, thereby achieving the purpose of improving the efficiency of the aerobic unit and significantly enhancing the overall process biochemical treatment efficiency level.

Characteristics of high-efficiency composite microbial strains

① The high-efficiency composite microbial strains can shorten the start-up time of the anaerobic stage, and the aerobic stage will complete the cultivation and domestication in a short time.

② It can effectively resist toxic substances and degrade them. It has strong adaptability to high ammonia nitrogen, high COD, high salinity, low temperature and other conditions. It can start quickly under various adverse conditions and complete the biochemical stage cultivation.

③ It contains various specially selected bacteria and enzymes, which have strong ability to remove benzene ring substances, improve the degradation and absorption of the non-biodegradable part of COD, and have high and rapid startup success rate.

④ Direct addition, convenient to use, saving manpower, material resources and time.

[Shangchen Environment - Engineering Application Cases]

[Leather Making High-salt Wastewater Renovation + Operation Project of Taishan Dasha Environmental Industrial Park]

The wastewater of the Dasha Environmental Industrial Zone Wastewater Treatment Plant mainly from the leather production wastewater of leather enterprises in the Park, and has a complex composition and contains high concentrations of chrome tanning materials, high concentrations of chlorides, sulfides, surfactants, chemical additives, oils and fats, and difficult-to-degrade organic matter. The wastewater volume for transformation of the Project is 4000t/d. The chloride ion content of the raw water is as high as 4000~8000mg/L. The wastewater has a high salt content, with an average TDS concentration of 4000-6000mg/L and an average conductivity of 8000-9000us/cm.

In view of the wastewater characteristics of the sewage treatment plant, the original process of the sewage treatment plant was upgraded and transformed, and the unique OSMMBR high-salt wastewater biochemical technology of Shangchen Environment was adopted. The water plant was operated professionally, breaking through the limitations of high-salt environment, metal and sulfide toxicity on the activity of biological strains, cultivating efficient and active bacterial strains under such conditions, and effectively improving the overall treatment process efficiency.

After technical transformation, the effluent meets the second period first level standard of "Water Pollutant Emission Limits" of Guangdong Province (DB44/26-2001). Taishan Environmental Monitoring Station conducts sampling supervision on the Dasha Environmental Industrial Zone Wastewater Treatment Plant from time to time, and the test results are all better than the emission standards, effectively controlling the impact of the project on the local environment and promoting the sustainable, stable and coordinated development of the local economy and environment.