Study on denitrification of aquaculture wastewater using immobilized microorganism technology

Nitrate contamination is becoming a widespread environmental problem. The application of immobilized microorganisms´ techniques to industry, especially in the biological wastewater systems and the production of metabolites, not only offers a high cell concentration in the reactor tank for increasing efficiency, but also facilitates the separation of liquid and solid in the settling tank. In this work, the applicability of cell immobilization to the aquaculture wastewater treatment process using the polyvinyl alcohol -boric acid (PVA-BA) method was investigated. The experimental results showed the denitrification efficiency of the aquaculture wastewater was over 80% under the conditions of hydraulic retention time =12h, pH=6.8, T=20-25°C, origin ammonia concentration =100mg/L.