“…Certain alluvial soils achieved extremely high purification efficiencies for Escherichia coli, and extremely high removal efficiencies for BODs, total phosphorus, total nitrogen, phosphate, ammonium, and ammonia (Lam et al, 1993). Singh et al (1993) concluded that the addition of various boron compounds to cowdung, human excreta, and distillery effluents affected the methanogenesis and increased biogas production. Miron and Ben-Ghedalia ( 1992) investigated the effect of sulphur dioxide application on the bio-388 degradability of wheat straw carbohydrates.…”