Offshore Polluted Water treatment by biocomposites flocculation

Shenzhen, a highly urbanized and rapidly developed coastal city in the past 40 years. Water of Shenzhen western coastal is heavily polluted, with a DO of 0.3-1.0 mg/L and turbidity of 13. Moreover, the water is in black color with sedimentary silt and bad smell. Therefore, Coastal water purification, silt clearance and smell expelling are necessary in order to recover the offshore ecology. It is urgent to find efficient, cost-effective and environmentally-friendly methods for the coastal sewage treatment. In this paper, the wastewater collected from Chiwan Bay and Qian Hai Bay was treated using various biological flocculants. The results showed that the removal rate of turbidity was 70.1~79.2%, and ammonia nitrogen (H4N+-N) was 40.8~49.6%. TN was 50.4~56.5%, COD was 70.1~76.3%, TP was 49.3~52.7%, and the removal rate of harmful marine vibrio was 79.9.3~96.6%. The results showed, the biological flocculants could be used to effectively treat the coastal wastewater.