水污染控制工程 污泥处理与处置（Treatment and disposal of sludge in water pollution control project）.docVIP

水污染控制工程12 污泥处理与处置（Treatment and disposal of 12 sludge in water pollution control project） The twelfth chapter sludge treatment and disposal Sludge treatment purposes Sludge treatment accounted for 20% to 50% of the total construction cost, or even 70%. The sludge produced by the sewage treatment plant accounts for about 0.3% to 0.5% of the treated water. Sludge contains a large number of harmful toxic substances, such as parasitic eggs, pathogenic microorganisms, bacteria, synthetic organic matter and heavy metal ions, etc., useful substances such as plant nutrients (nitrogen, phosphorus, potassium), organic matter and water, etc.. Sludge treatment and disposal to achieve the following objectives: (1) make the sewage treatment plant run normally and ensure the effect of sewage treatment; (2) make proper treatment or use of toxic and harmful substances; (3) make the organic compounds easy to corrupt and smell get stable treatment; (4) make useful material get comprehensive utilization, change harm into benefit. 12.1 classification, property and production of sludge 12.1.1 classification 1) divided into different parts according to the composition: The sludge organic matter is the main component, and the precipitate in the primary sedimentation tank and the two sedimentation tank are all sludge. Easily rotten, smelly, fine particles, small proportion (about 1.02 ~ 1.006), high moisture content and not easy to dehydrate, gelatinous structure. Sediment is called sediment with inorganic substance as main component. The main properties of the sediment are coarse particles, large proportion (about 2), low moisture content, easy dehydration, poor liquidity. Sediment of grit chamber and sedimentation tank of some industrial waste water belongs to sediment. 2) according to different sources: Primary settling sludge comes from primary settling tank. Residual activated sludge comes from the two sedimentation tank after activated sludge process. The two settling tank of humic sl