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A new process for reduction of waste sludge by ultrasound has been demonstrated. In former studies, ultrasound was mainly used for dehydration of waste sludge. Otherwise, it has been reported that ultrasound could efficiently provide a chance for excess sludge removal in reactor directly. Therefore, ultrasound was suggested to reduce waste sludge in SBR reactor in this paper. The results showed that...
As the oil shale retorting process is unique, resulting wastewater contains large amounts of oil, sulfide, cyanide, volatile phenol, ammonia and other toxic substances, its high content of COD and refractory material and more. This paper attempts to establish a comprehensive titanium dioxide photocatalytic water treatment methods of oil shale, and shadow detail catalytic sewage treatment factors such...
Water quality criteria and standard are derived mainly from acute toxicity data of chemicals, and acute toxicity data of chemicals are generally obtained from laboratory experiment. The nature water and experiment dilution water are different. The suspended articulate, humic acid and other factors in nature waters can change the concentrations of chemicals. In this paper, acute toxicity differences...
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