Journal
APPLIED WATER SCIENCE
Volume 2, Issue 2, Pages 87-94Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13201-011-0025-y
Keywords
Algae; Decay; Organic matter; Wastewater
Categories
Funding
- Netherlands Government through the Netherlands Fellowship Programme (NFP)
- Government of Ghana through Ghana Educational Trust Fund (GETFUND)
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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 C13.9 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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