Abstract
Rates of oxygen consumption varying from 0·006 to 0·41 g/m 2 per hr were obtained during an investigation of sediments collected from 74 sites in 12 river systems during January-February and July-August 1966. The distribution of these rates was similar in both surveys and no correlation was found between rates of oxygen consumption and any chemical property of the mud. Strong correlations were obtained between all the chemical properties examined-permanganate value, loss on ignition, and contents of humic acid, organic carbon and Kjeldahl nitrogen. Deposits in reaches below outfalls from sewage-treatment works operating percolating filters to a nominal effluent standard of 30 mg/l suspended solids and 20 mg/l BOD were not found to differ significantly from those in unpolluted reaches. However, both were significantly different from deposits downstream of outfalls from works using the activated sludge process.
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