Sludge ozonation: disintegration, supernatant changes and mechanisms.
Sludge ozonation: disintegration, supernatant changes and mechanisms.
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DOI：
10.1016/j.biortech.2008.08.041
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发表时间：
2009-02
影响因子：
11.4
通讯作者：
Guangming Zhang;Jing Yang;Huanzhi Liu;Jie Zhang
中科院分区：
文献类型：
--
作者：
Guangming Zhang;Jing Yang;Huanzhi Liu;Jie Zhang
本文详细研究了臭氧氧化过程中污泥的崩解和上清液的变化，并探讨了可能的机理。臭氧有效地溶解了污泥。最重要的机制是微生物细胞的损伤。臭氧投加量为50 mgO 3/gDS时，污泥的溶解效果最好，25 mgO 3/gDS时，90 min后污泥的溶解率仅为10.4%，80 mgO 3/gSS不能进一步促进污泥的分解。当臭氧投加量为50 mgO 3/gDS时，105 min后污泥的崩解度为46.7%。污泥固体浓度和挥发性固体浓度分别下降了49.1%和45.7%。上清液可溶性化学需氧量、总氮、总磷、蛋白质、多糖和脱氧核糖核酸分别增加了699%、169%、2379%、602%、528%和556%。各种成分显示出完全不同的模式。臭氧处理显著降低了污泥的生物活性，降低了重金属在污泥和上清液之间的分配系数，但没有改变污泥的粒径分布。
This paper studied in detail the sludge disintegration and supernatant changes during ozonation and investigated the possible mechanisms. Ozone effectively lysed the sludge. The most important mechanism is proposed to be damages of microorganism cells. The ozone dose of 50mgO3/gDS was found optimal for sludge lysis; 25mgO3/gDS achieved only 10.4% sludge lysis after 90min and 80mgO3/gSS did not further improve sludge decomposition. When the ozone dose was 50mgO3/gDS, the sludge disintegration degree was 46.7% after 105min. The sludge solid concentration and volatile solid concentration decreased by 49.1% and 45.7%, respectively. The supernatant soluble chemical oxygen demand, total nitrogen, total phosphorus, protein, polysaccharide, and deoxyribonucleic acid increased by 699%, 169%, 2379%, 602%, 528%, and 556%, respectively. Various components showed quite different patterns. Ozone treatment significantly reduced the sludge bioactivity, decreased the partition coefficients of heavy metals between sludge and supernatant, but did not alter the sludge size distribution.