ผลของการเติมของเสียอินทรีย์ที่มีต่อลักษณะการชะละลายจากดินที่ปนเปื้อนตะกั่วในระดับสูง

Abstract

A laboratory leaching column experiment was conducted to study the effects of three organic waste types (i.e., cow manure, sewage sludge and municipal solid waste compost) on the leaching characteristics and distribution of Pb among soil fractions from highly Pb-contaminated soil. The organic wastes were applied to the soil at the rates of 1%, 3%, 5% and 10% (dry weight basis) in the presence and absence of EDTA at 5 mmol kg^-1. The results from 8-week leaching column study indicated that the application of the organic wastes decreased in both the concentration and total amount of Pb from leachates. The COD and Pb concentrations in the leachates were markedly enhanced by addition of EDTA. Sequential fractionations of leached soil showed that addition of these organic wastes on the highly Pb-contaminated soil can redistribute Pb from more to less mobile fractions, and potentially decrease the mobility in soil profiles.