Effects of Zero Valent Iron on the Leaching Characteristics of Nitrate and Soluble Chloride in the Municipal Sludge

• Main Authors: Yi-Pao Liao, 廖義博
• Other Authors: Jih-Ming Chyan
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/02836608066067847958

碩士 === 嘉南藥理科技大學 === 環境工程與科學系暨研究所 === 94 === The aim of this study is to examine the effect of zero-valent iron on the co-compost of zero-valent iron and sewage sludge. The leachability of nitrate and soluble chloride in sewage sludge was observed during the composting period. Samples of sewage sludge were gathered from the An-Pin sewage treatment plan in Tainan City. The experimental parameters were designed as follows: Fe0/sludge mass ration :0-30g/kg, water content of compost: 80%, sampling time of compost: 0, 5, 10, 20 and 30 day.The sewage sludge was firstly completely mixed with Fe0 for 18 mins and the packed into plastic columns with a 9.5 cm inner diameter and 35 cm hight. To discuss the effect of acid precipitation on the sludge co-compost, acidified water with pH = 4.0 was prepared by spiking H2SO4 into D.I. water. The water content, elemental conpsition, C/N, nitrate, nitrite, amino-nitrogen, soluble chloride and ferrious ion in the sewage samples were determined. The leachate from the column were collected in a beaker and used for the analysis of NO3--N, NO2--N, NH3-N and soluble chloride. Based on the results of experiments, it was found that zero-valent iron appeare to have no effect on the reduction of NO3- in the sewage sludge. On the other hand, Fe0 was found to reduce the soluble chloride in the sludge singnificantly.