The effect of algal biomass on the removal of faecal coliform from domestic wastewater
2012
Ansa, E. D. O. | Lubberding, H. J. | Gijzen, H. J.
The effect of algal density on faecal coliform (FC) decay under conditions of light and darkness were monitored in low and medium strength wastewater and in a ‘mixture of treated and raw wastewater’ depicting conditions of a variety of dissolved organic compounds. Rates of decay of FC varied in darkness with varying chlorophyll-a concentrations, supporting the hypothesis that algae may produce substances that are toxic to FC. The first empirical evidence that an optimum chlorophyll-a concentration (10 ± 2 mg L⁻¹) for maximum FC destruction in wastewater exist is reported. Rate of decay was higher in medium strength wastewater compared with low strength wastewater at higher algal densities of ≥13.9 mg L⁻¹ chlorophyll-a both in light and in darkness, while addition of fresh wastewater to an ongoing wastewater treatment process may lower the rate of FC decay for a wide range of algal densities (0.6–19.6 mg L⁻¹), under light conditions.
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