Study On Strain Wastewater Denitrification Technical

Antibiotic wastewater has high concentration organic pollutant, excessive nitrogen source, and also has poor Biodegradability. Current biological treatment technology is hard to reach the standard, as per this present situation, regarding the strain wastewater as the research object, by comprehensive analysis of the water quality characteristics of wastewater and on the basis of analyzing biochemical restraining factors and control technology, a technical flow of Magnesium ammonium phosphate precipitation process pre treatment-anaerobic-aerobic and circular backflow nitrification, denitrifying process was established to deal with the strain wastewater which is hard to degraded and has more ammonia and nitrogen.This experiment first identified the best reaction conditions of Magnesium ammonium phosphate precipitation process and also test the strain wastewater, the result is Magnesium ammonium phosphate precipitation process to deal with strain wastewater can choose tris sodium and magnesium chloride as the best precipitation agent combination, the optimum reaction conditions are stirring speed 100 r·min-1, pH value for 8.5, reaction time is 15 min, n(Mg2+):n(NH4+):n(PO43-) is 1:1:1, under which ammonia nitrogen removal efficiency reached about 90%, at the same time on the COD, chroma has certain removal efficiency, COD removal about 10%.The research result of strain wastewater biochemical indicate that the main factor for affecting biochemical degradation process is proportion between carbon & nitrogen and nourish source are imbalance (nitrogen source excess).Through biochemical experiment, result can get that after Magnesium ammonium phosphate precipitation process pretreatment strain waste water, biochemical can be significantly improved. In anaerobic process, good metabolic characteristic was indicated, clean water COD concentration for 6000 mg·L-1 or so, wastewater COD removal would to 80%, the water of ammonia nitrogen concentration of less than 20 mg·L-1. That Magnesium ammonium phosphate precipitation process pretreatment on strain of wastewater biochemical can be improved significantly.Continuous test results show that Magnesium ammonium phosphate precipitation process pretreatment-anaerobic digestion--aerobic process to deal with high concentration, hard-degradation waste strain can better remove organic pollutant. During experimental operation, incoming load 8～10 kgCOD·(m3·d)-1, anaerobic digestion processing device COD removal rate 70%～80%, aerobic biochemical device can maintain COD removal would over 80%, the whole process system COD removal rate is 90%, total effluent COD concentration in basic stable 225 mg·L-1 or so, total effluent ammonia nitrogen concentration in basic stable 9-20 mg·L-1, which removal rate is 90%. Total nitrogen removal rate can amount to 87%. effluent of Total nitrogen is 65 mg·L-1.