Abstract:

In China’s coastal area, most of the abandoned shells of seafood are processed as rubbish, which are becoming into potential environmental hazards; Waste utilization is a good choice. An experiment-scale anaerobic fixed film reactor (AFFR) with waste product from mariculture-shell as biomass carrier, treating domestic wastewater was conducted in 98 days at 18-25℃. The characteristics of substrate degradation levels in anaerobic acidogenesis were investigated under hydraulic retention times (HRTs) 4 h, 8 h and 12 h. Averaged COD removal efficiencies of 55.0%-58.9% were achieved during operation period. Averaged TP removal efficiencies of 16.90%, 25.95% and 27.43% were achieved under HRTs 4 h, 8 h and 12 h, individually. The alkalinity of shell releasing in anaerobic acidogenesis was sufficient to buffer the pH system. The effluent pH increase associated with the shell was observed obviously, getting averaged 11.6% and 16.5% of pH increasing rate under HRTs 8 h and 12 h. Preliminary technical and economic feasibility analysis indicates that shell is an ideal biomass carrier and 8 h is optimum HRT parameter for anaerobic reactor.

Key words: acidogenesis, wastewater treatment, fixed film reactor, phosphorus removal, shell carrier