摘要：

采用半连续运行的序批式反应器进行污泥酸性发酵试验，研究了发酵液中FeCl₃浓度对污泥发酵产物中丙酸比率的影响。实验表明：在温度32℃、HRT 6.6 d、进泥VS浓度 20.43 g·L^-1、pH5.5～6.0的条件下，FeCl₃浓度由0增加到232 mg·L^-1时，发酵液中ORP逐渐提高，丙酸比率变化不大；FeCl₃

关键词: 污泥, 丙酸型发酵, 启动方式, 三氯化铁

Abstract:

Effects of ferric chloride (FeCl₃) concentration on the product distribution of acidogenic fermentation of sludge, expressed by propionic acid ratio, was investigated in sequencing batch reactor with semi-continuous operation mode.The results show that under these conditions: temperature 32℃, HRT 6.6 d, feed VS 20.43 g·L^-1, pH 5.5—6.0, ORP of fermentation liquid increases gradually while propionic acid ratio in fermentation products changes a little, although FeCl₃ concentration varying from 0 to 232 mg·L^-1.When the concentration of FeCl₃ is at 464—928 mg·L^-1range, ORP increases significantly and at the same time propionic acid ratio goes up from 25.82% to 49.57%.One feasible start-up modes are proposed with aerobic activated sludge for sludge acid-type fermentation using conditions of temperature 32℃, HRT 6.6 d, pH 5.5—6.0, FeCl₃ 464 mg·L^-1.With this start-up mode, acid-type fermentation can run smoothly after 6 day and propionic acid ratio can reach 50%.

Key words: 污泥, 丙酸型发酵, 启动方式, 三氯化铁