| Summary: | 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.
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