Sludge reduction by ozone in municipal wastewater treatment plants
Sludge reduction by ozone in municipal wastewater treatment plants
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发表时间：
2014
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通讯作者：
L. Wang
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作者：
L. Wang
采用半连续模式实验，考察了臭氧投加量和初始pH对臭氧减量污泥的影响。结果表明，随着臭氧投加量的增加，污泥的增溶率增加，有机物、氮、磷逐渐释放到污泥的水相中。最佳臭氧投加量为150 mg·g-1左右(SS)，此时污泥增溶率可达26%左右。初始pH值为中性或碱性时，污泥减量效果较好，此时污泥的增溶率较高，有机物和氮的释放量较大。臭氧污泥回用于生物处理系统对微生物活性及COD、TN的去除效果没有明显影响，但由于生物处理系统剩余污泥零排放，除磷效果明显下降。Ca(OH)2对臭氧氧化污泥上清液除磷的实验结果表明，较高的Ca/P摩尔比有利于除磷，当Ca/P摩尔比控制在10.0左右时，TP的去除效率可达80%以上。
Semi-continuous mode experiments were adopted to examine the effects of ozone dose and initial pH on the sludge reduction by ozone. The results indicated that,as the ozone dose increased,the sludge solubilization ratio increased and the organic compounds,nitrogen and phosphorus were gradually released into the water phase of sludge. The optimal ozone dose was around 150 mg·g- 1( in SS),at which the sludge solubilization ratio could reach about 26%. An initial neutral or alkaline pH value favored the sludge reduction,under which a high sludge solubilization ratio was obtained and the release of organic compounds and nitrogen was enhanced. The recycling of ozonated sludge to biological treatment system had no obvious impact on the microbial activity and the removal efficiencies of COD and TN,while the removal efficiency of phosphorus declined obviously because of the zero discharge of excess sludge from the biological treatment system. The experimental results of phosphorus removal from ozonated sludge supernatant by Ca( OH) 2 indicated that a high Ca / P molar ratio was beneficial for phosphorus removal; when this ratio was controlled at about 10. 0,the removal efficiency of TP could reach more than 80%.