The technology for removing ammonia from wastewater by the biological method researched and developed by the Sinopec Fushun Petrochemical Research Institute recently passed the technical appraisal organized by the China Petrochemical Corporation in Fushun, Liaoning. This innovative technology can effectively remove ammonia-nitrogen pollution sources from wastewater from refinery chemical production. At present, it has applied for 9 Chinese patents for inventions. Experts recommend that industrial application tests be conducted as soon as possible.
The technology includes the efficient enrichment of nitrifying bacteria, the expansion and cultivation of nitrifying bacteria, ammonia nitrogen wastewater treatment methods and equipment, and the quick start-up process of ammonia nitrogen wastewater treatment, which solves the problem of slow growth of bacteria, poor resistance to shocks, and other issues. The treatment process of ammonia nitrogen wastewater adopts a new type of bacteria retention method, which effectively improves the reaction effect and overcomes the problem of bacterial bleed out in the existing process. This technology is aimed at the production of catalytic cracking catalysts and hydrocracking catalysts for the production of wastewater, screening, isolation and optimization of culture, and obtained the expected results in a continuous experimental device.
Fushun Petrochemical Research Institute developed the process and cultured bacteria, which can reduce the ammonia nitrogen in the catalyst production wastewater from 500 to 1200 ?/l to below 10 ?/l, and reduce the ammonia nitrogen in the wastewater from the refining production to 100 to 500 ?/l. 10?/l below. Using this technology, in the laboratory treatment of ammonia nitrogen concentration of 1500mg / l of the water sample, the hydraulic retention time of 14 hours, continuous experimental device to start 3 days to achieve stable operation, ammonia nitrogen removal rate of up to 99%. The catalyst was treated on continuous test equipment to produce wastewater containing ammonia nitrogen. The hydraulic retention time was 18 hours. After the stable operation, the ammonia nitrogen removal rate was above 99%. The effluent ammonia nitrogen concentration was lower than 10 mg/l. The ammonia-containing wastewater from the petrochemical industry could be treated to meet the requirements. The first-level discharge standard stipulated in the Integrated Wastewater Discharge Standard.
With the country's increasingly stricter control of discharge and total discharge of waste water from the outside world, it will be increasingly important to adopt environmentally safe new technologies and new technologies for biological nitrogen removal. At present, there is a lack of economical and mature treatment technologies for ammonia-containing wastewater from the production of molecular sieve catalysts and ammonia synthesis processes. Therefore, biological nitrogen removal from wastewater has become an important research topic for water pollution control. The removal of pollutants in wastewater by biological methods is usually the last step of wastewater treatment. It has a low investment in equipment and a low operating cost, and has a very broad promotion and application prospects.
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