作者： ebenezer d.o , Lucy Oye Addo
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摘要: The reuse of domestic wastewater presents many challenges including the risk pathogen infection; hence removal pathogens from is very relevant. It known that algae play a crucial role in process their by raising pH and dissolved oxygen concentration which tend to be injurious bacteria. however not how algal disinfection ability affected biomass changes sewage varying strengths whether contribute sedimenting faecal coliforms (FC) water column through attachment surfaces. Experiments were conducted investigate importance FC algae, effect different on tropical eutrophic lake. reducing densities pilotscale hybrid algae-duckweed pond system was also investigated with aim understanding such treatment relation pure duckweed lines. Algae helped bottom reactors. shown experimentation under laboratory conditions an optimum density exists at maximum achieved. important significantly Escherichia coli contamination lake increased oxygenation elevation. At ≤0.08mgL Weija Lake, decay rate E. directly proportional chlorophyll strength undergoing may affect FC, particularly as changes. In darkness, higher (or concentration) resulted inactivation although low suggesting another factor FC. ≥ 13.9mg L occurred MSW (medium wastewater) compared LSW (low light or darkness. highest 3.2mgL while 20.0mgL light. Addition raw ongoing lowered for wide range (0.6 – 19.6mgL concentration), conditions. performed well (4.3 log units) Biochemical Oxygen Demand (BOD) (89%) these parameters addition total phosphorus seasonal suspended matter only first two ponds duckweed, systems. Little variation depth observed. rates mornings usually lower than afternoons but ponds. High macro-invertebrates belonging class Ostracoda associated mainly surface much similar locations. numbers correlated strongly positively mean ostracod Shannon-Wiener diversity index all three Integrating this aquaculture would big boost economically health-wise communities developing countries warm