污泥处理条件对臭氧破解污泥能力的影响

Effect of Treatment Conditions on Cracked Sludge by Ozone

利用臭氧强氧化性,使污泥细胞破解有机质溶出,实现活性污泥的全循环再生化处理,达到污泥"零排放"的目的.本研究改变处理条件(臭氧投加量、反应时间和空气进气量等),系统地检测反应前后污泥混合液的各项指标(总悬浮固体、挥发性悬浮固体、溶解性化学需氧量、氨氮、总磷、污泥沉降比),探讨臭氧氧化破解污泥反应的机理.由实验可知,在臭氧氧化破解污泥实验中,投加的臭氧量(相对于总悬浮固体)为0.27,g/g,反应时间为30,min,空气进气量为2.0,L/min时,破解的效果达到最佳,总悬浮固体的减少量达到2.8,g/L.气体流量越大破解效果越好,在空气进气量为2.0,L/min的条件下,臭氧氧化破解污泥实验效果最佳.随着臭氧投加量的增加,MLSS减少速率将由慢到快,然后趋于平缓,最佳投放量为0.25,g/g时,总悬浮固体减少量为1.42,g/L,SCOD的增加量为626,mg/L,氨氮和总磷的增加量分别为10.7、1.068,mg/L.

To achieve zero sludge emissions, sludge cells were broken and organic matters were dissolved by using the strong oxidizing property of ozone, so as to realize the full recycling and second biochemical treatment of activated sludge. In this study, the change of some indexes in the process of sludge ozonation, such as MLSS, MLVSS, SCOD, NH3-N, TP and SV was systematically investigated under the conditions of different ozone doses, reaction time, and air inlet flow. The mechanism of the sludge ozonation reaction was discussed according to the changes of those indexes. When the ozone dose relative to MLSS was 0.27 g/g, reaction time 30 rain and the inlet flow rate was 2.0 L/rain, the effect of dismissing was the best in the experiments of ozonic disintegration of waste activated sludge. The MLSS decrease was 2.8 g/L. When the inlet flow was greater, the effect of disintegration by ozonic treatment was better. In the condition of the inlet flow rate at 2.0 L/min, the effect of disintegration by ozonic treatment was best. With the increase of ozone dosage, MLSS reduction rate was slow first and then fast. Finally it leveled off. With the best ozone dose which was 0.25 g/g, MLSS reduction was 1.42 g/L ; the concentration of SCOD, NH3-N and TP increased by 626 rag/L, 10.7 mg/L and 1.068 mg/L respectively.