Mesophilic anaerobic digestion of waste activated sludge after ultrasonic and NaClO pretreatment
超声与次氯酸钠耦合预处理剩余污泥的中温厌氧消化效果

The pretreatment process of waste activated sludge from wastewater treatment plant was carried out using the combination of ultrasonic and NaClO treatment,the effects of pretreatment on sludge disintegration and anaerobic digestion were studied.The results showed that the optimal ultrasonic power intensity of this synergetic pretreatment was 1.0 W/mL and the best disintegration time was 50 min.It was discovered that the treatment of ultrasonic in the presence of 4.023 mg/g SS NaClO under the conditions led to the best improvement of sludge anaerobic digestion.The biogas production ratio and methane content was enhanced by 69.73% and 10%,respectively.Meanwhile,the volatile solids removal ratio increased from 11.11% to 21.24%,the quantity of waste acitivated sludge was reduced to some extent.