Variation of Nutrient Content Such as N、P in Sludge from Taiyuan City during the Bioleaching Process

• 1、Taiyuan University of Technology
• 2、College of Environmental Science and Engineering,Taiyuan University of Technology

Abstract：Sludge from wastewater treatment plant contains massive organic matters and plant nutrient such as N, P, K, and agricultural applicability isa economic and effective method to solve the sludge problem. However, sewage sludge enriched 50%~80% of heavy metals in the sewage, if it was applied directly on the farmland would lead to the accumulation of heavy metals in the soil, threatening human’s health, so how to effectively reduce the concentration of heavy metals in municipal sludge becomes the key issue of sludge agricultural application. According to the characteristic of heavy metals in sewage sludge of Taiyuan city, sewage sludge and sodium thiosulfate were adopted as culture medium and substrate to cultivate Thiobacillus thiooxidans(T.t) for heavy metal removal in the present study, and the change of nutrient content during the bioleaching process were mainly studied.

Keywords： sewage sludge bioleaching Acidithiobacillus nutrition