气田污泥脱水工艺研究

在对气田废水处理中产生的污泥进行处理时,普遍存在着干化周期长、含水率高等问题,严重影响了废水处理装置的处理能力。脱水剂优化选择实验以及污泥脱水性能实验结果表明:先加入聚合氯化铝并搅拌15 s,再加入阴离子聚丙烯酰胺并搅拌混合30 s,最后加入FO4190SH搅拌,混合凝聚30 s后静止分层,其凝聚效果较好。在污泥脱水性能的各项指标中,真空脱水均好于重力脱水,特别是对于新鲜污泥滤层,真空(45 kPa)脱水速度比重力脱水速度约高8倍。

Dehydration Technology for Treatment of Sludge in Gas Field

During the treatment process of sludge produced from sewage disposal in gas field, there are always a long drying period for sludge and high water cut, which has a harmful effect on the treatment capacity of devices. The experiments on optimum dehydrating agents and sludge dehydration capacity show that the following technology can achieve better result. Firstly, polymerized aluminum chloride is added into the treated sludge and stirred for 15 seconds. Secondly, anionic polyarylamide is added and stirred for 30 seconds. Finally, FO4190SH is added and mixed for 30 seconds. The mixed fluid is laminated stably. The capacity of vacuum dehydration is better than that of gravity dehydration. Especially for the fresh sludge, the velocity of vacuum dehydration (at 45 kPa) is eight times higher than that of gravity dehydration.