Malt house wastewater treatment with settleable algal-bacterial flocs

Abstract

This paper deals with biological treatment of malt house wastewater using algal-bacterial flocs. During three months of testing, optimisation of growth conditions and biomass separation leads to maximisation of biomass production, improved flocs settleability and increased pollutant removal efficiency while maintaining low energy demand. At a high food to microorganism ratio (0.16 to 0.29 kg BOD5 kg(-1) TSS d(-1)), the biological oxygen demand (BOD5), chemical oxygen demand (CODCr), total phosphorus (Ptot) and total suspended solids (TSS) removal efficiencies were all higher than 90%. At a food to microorganism ratio of 0.06 kg BOD5 kg(-1) TSS d(-1), BOD5, CODCr, total nitrogen (Ntot), Ptot and TSS removal efficiencies of 99.5%, 97.6%, 91.5%, 97.8% and 98.4%, respectively, were achieved. The study also proved a strong dependence of removal efficiencies on solar radiation. The results suggest the algae-bacteria system is suitable for treatment of similar wastewater in locations with available land and sufficient solar radiation and temperature during the whole year.

Isolation of Photosynthetic Bacteria from Coal Mining Site Having Potential for Nitrate Removal

“…The nitrate reduction curves in Figure 6 have parallel trend line across the different concentrations of nitrate except at 235 mg/L. This indicated that there is no much difference in the pattern of nitrate removal by Rhodobacter spp over different concentrations [17]. Nitrate removal curves at 320 mg/L and 325 mg/L almost immediately reached stationary phase between days 1 to 3.…”