Experimental Study On Dehydration Of Waterworks Sludge

Water treatment plant supplies potable water as its product, generates its wastewater. The wastewater consist of the sludge flushed out from the sedimentation tanks and the wash water disposed from the filter beds. If they were discharged directly to the nearby water course where the raw water was taken from, the wastes would not only contribute the pollution problems but also waste a large amount of water. Currently, people are facing the crisis that water resource is shortage, and water has been seriously polluted. Water treatment plants, the casualties of water pollution, shouldn't even more contribute to the pollution. So, people pay more attention to the treatment of waste from the water treatment plantsAccording to surveys and the character of the wastewater from Shahekou WaterTreatment Plant centrifuges were used to dewater sludge.determining to de velop the field experiments for wastes treatment were carried out at Dalian Shahekou Water Treatment Plant by Dalian Water Works CO. Ltd.The experiments included three parts: Choosing treatment process suitable for the wastewater from Shahekou Water Treatment Plant; Laboratory screening polymers used for sludge conditioning; Centrifuge tests and results;Based on the data, the centrifuges were selected as the best mechanical dewatering devices for Biliu water treatment plants. The major advantage of centrifuge is automation, wide adaptability, small floor area, high solid content, good filtrate, high recovery percent, low polymer needed, and good environmental health, etc. Three basic types of polymer, cationic, nonionic and anionic are all suitable for wastewater treatment in Shahekou Water Treatment Plant. The solid content is usually above 40 percent and recovery percent is over 99. The dosage of polymer is also low.The study in the water treatment plant wastewater began later and experience is shortage. There are still lots of problem needed to solve.