碱—热法预处理改善污泥厌氧消化性能的试验研究

Enhancement of sewage sludge anaerobic digestibility by pretreatment of alkaline-thermal methods

用传统热化学法（简称同步法）促进污泥水解,将污水厂浓缩污泥预先用NaOH处理24 h,然后再进行热处理（简称碱-热法）。以生物化学甲烷势（BMP）试验后污泥的溶解性化学需氧量（SCOD）去除率和产气量来评价碱-热法预处理对污泥厌氧消化性能的影响。BMP试验结果表明：经碱-热法处理的污泥,SCOD去除率是同步法预处理污泥SCOD去除率的1.06~1.31倍,产气量是同步法预处理污泥产气量的1.08~1.31倍。可见,碱-热法能有效提高污泥中有机物的可生化性,减少厌氧消化后污泥的剩余SCOD浓度,提高生物气产量。

Traditional thermochemical method promoted the thermal hydrolysis treatment on sewage sludge which had been pretreated by alkaline for 24 hours.The SCOD removal rate of sludge and the biogas production of anaerobic digestion were examined to investigate the effects of alkaline-thermal hydrolysis on the digestibility of sewage sludge.Biochemical methane potential（BMP） experiment results showed that the SCOD removal rate of alkaline-thermal pretreatment is 1.06~1.31 times as high as the traditional thermochemical＇s SCOD removal rate.The biogas product of alkaline-thermal pretreatment is 1.08~1.31 times as high as the traditional thermochemical＇s.The biodegradability of sewage sludge can be remarkable improved by alkaline-thermal pretreatment,for it could reduce the residual SCOD of digested sludge and increase the production of biogas.