摘要
文章进行了超声波促进污泥脱水减量并提高污泥厌氧消化效率的中试。中试装置每天可处理3 000 kg含水质量分数在99%以上的剩余活性污泥。实验结果表明,当超声波频率为28.7 kHz、输出电压为70 V,作用时间为2 m in,絮凝剂投加质量分数为8‰(干基)时,污泥滤饼含水质量分数比未经超声波作用的降低2%,体积减少8%,污泥的脱水效果最佳。当超声波输出电压为150 V,作用时间60 m in时,污泥厌氧消化时间比传统方法缩短20 d。同时沼气产生速率比未经超声波作用的提高6倍,前25 d沼气总产量比传统污泥厌氧消化过程增加4—5倍。可见大功率、长时间有利于促进厌氧消化,从而达到污泥减量的目的。
A pilot-scale experimental study on promoting sludge reduction and improving sludge anaerobic digestion efficiency by ultrasonic was carried out. About 3 000 kg excess activity sludge with more than 99% water per day was treated in the pilot plant. It showed that ultrasound with a frequency of 28.7 kHz, an output voltage of 70 V, acting for 2 min, and adding 8‰ dosage of flocculent （on dry basis） was preferred for the best efficiency of sludge dehydration in experiments, when the ratio of water in sludge cake decreased by 2%, and the sludge volume decreased by 8%, comparing with that without ultrasound. With an output voltage of 150 V, acting for 60 min, 20 d for anaerobic digestion could be saved comparing with the traditional method. At the same time, the producing rate of biogas was improved by 6 times and the total yield of biogas was increased by 4-5 times during the first 25 d than that without ultrasonic action. Therefore, ultrasound with high power intensity and long action time was preferred for promoting anaerobic digestion and achieving the purpose of sludge reduction.
出处
《化学工程》
EI
CAS
CSCD
北大核心
2008年第2期46-49,共4页
Chemical Engineering(China)
关键词
超声波
污泥脱水
厌氧消化
ultrasonic
sludge dewatering
anaerobic digestion
作者简介
马守贵（1982-），男，硕士研究生，主要研究方向为超声化学工程及化工环保，E—mail：blueiee094@126．com；
吕效平，通讯联系人，电话：（025）83588072，E-mail：xplu@njut．edu．cn。
