Roles of Substrate Enzyme Activities in Subsurface Wastewater Infiltration System

The correlation of substrate enzyme activities and their purification effects were studied in a subsurface wastewater infiltration system(SWIS). The results showed: enzyme activities in different depths were different, even in different months proteinase were different. There was significant correlation between phosphatase activity and removal rates of TP(r = 0.9885), BOD(r = 0.9022) and COD(r = 0.9792). It probably proves that phosphatase is important factor in the removal of TP, BOD and COD. There was significant positive correlation between urease activity and removal rates of TN(r = 0.9698). It probably indicates that urease is responsible for removal of TN. Proteinase activity was not interrelated markedly to reduction of BOD, COD, TP, TN, ammonia-N. These conclusions give reference to future researches on utilizing substrate enzyme activity as evaluating purification effects in SWIS.