Abstract
Laboratory column studies were conducted to examine the feasibility of using horticultural peat as a filter medium to treat slaughterhouse and dairy wastewaters. A 100 mm diameter column with 300 mm depth of peat was used for each wastewater application. The slaughterhouse wastewater was fed continuously to the column at a hydraulic loading rate of 3·55 m 3 3 /m 2 per day. The column clogged at the end of five days. In the five day period, the system achieved SS, BOD, COD and P removals of 94, 66, 65 and 87% respectively. In the case of dairy wastewater, the column clogged at the end of 18 hours at an application rate of 3·55 m 3 /m 2 per day. When the hydraulic loading rate was lowered to 2·13 m 3 /m 2 per day, the column operated for 81 hours before clogging. At the end of the lower hydraulic loading rate, the system achieved SS, BOD, COD and P removals of 99, 61, 51 and 48% respectively. Earlier clogging noticed in the case of dairy wastewater was due to the higher levels of SS (2650 mg/litre) in comparison to the SS in slaughter house wastewater (243 mg/litre).
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