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为了保证注水水质达标,油田污水站采用连续排泥工艺降低悬浮物和泥沙的含量,由此产生大量含水率高的污泥,造成运输费用及后续无害化处理费用的增加,因此,需要对污泥进行减量处理。以卧螺离心机为关键设备,设计了1套污泥离心脱水减量工艺。通过现场试验得到转速、差速、絮凝剂投加量、温度对减量效果的作用规律。在一定范围内,转速越高、差速越低、絮凝剂投加量越大、温度越高,处理后的污泥含水越少。采用正交试验方法优化得到工艺最佳运行参数:转速为2 500 r/min,差速为9 r/min,加药量为225 g/m3,温度为55℃。处理后,平均含水率从入口的97.37%下降到出泥口的59.17%,平均含固率从入口的1.73%上升到出泥口的33.72%。离心机出水口和出泥口分流比范围为24.14∶1~33.19∶1,对应的污泥减量比例为96.02%~97.08%,污泥减量效果很好。
In order to ensure the quality of water injection standards, the oil field sewage station uses a continuous sludge discharge process to reduce the content of suspended solids and sediment, resulting in a large amount of sludge with high water content, resulting in increased transportation costs and subsequent harmless treatment costs, therefore, Sludge reduction. Decanter centrifuge as the key equipment, design a set of centrifugal dewatering sludge reduction process. Through the field test, the effect of temperature, differential speed, flocculant dosage and temperature on the decrement effect were obtained. In a certain range, the higher the speed, the lower the differential, the greater the amount of flocculant dosing, the higher the temperature, the less sludge the treated sludge. The optimal operation parameters of the process were optimized by orthogonal test: speed of 2 500 r / min, differential speed of 9 r / min, dosage of 225 g / m3 and temperature of 55 ℃. After treatment, the average water content decreased from 97.37% at the inlet to 59.17% at the outlet, and the average solid content increased from 1.73% at the inlet to 33.72% at the outlet. Centrifuge water outlet and the outlet of the diversion ratio range of 24.14:1 ~ 33.19: 1, the corresponding sludge reduction ratio of 96.02% ~ 97.08%, sludge reduction effect is very good.