【摘要】 实验研究了适用于车载式钻井废水处理装置的混凝处理及离心分离处理工艺。实验用钻井废水样取自四川气田 5个不同构造的钻井现场 ,pH值 7.1～ 8.5 ,色度 2 4 9～ 10 0 0 ,CODcr5 5 0～ 2 5 32 2 ,石油类 0～ 12 6 4mg/L ,悬浮物 180 0～ 2 70 0mg/L ,含渣率 (混凝离心 1min后含水残渣占原废水的体积百分率 ) 3.8%～ 2 0 %。结果表明 ,聚合氯化铝 (PAC)的混凝沉降效果最好 ,加量随含渣率和含油量增大而增大 ;含渣率 <6 %的废水加入适量PAC ,在沉降池中停留 15～ 2 0min ;含渣率 6 %～ 15 %的废水除加入PAC外还需加入助凝剂PAM ,沉降时间 2 0～ 2 5min ;含渣率 >15 %的废水除加入PAC和PAM外 ,还需进行离心分离 ,离心分离因数 2 80 0 ,离心时间 >5s。采用以上方法可实现水、渣、油有效分离 ,残渣含水 86 .2 %～ 95 .4 %。图 6参 4。更多还原

【Abstract】 A drilling wastewater treating technology by coagulation/centrifugalization is studied experimentally to fit in with mobile equipments. The wastewater samples are taken from 5 different drilling sites in Sichuan gas fields with pH 7.1～8.5, colority 249-1 000, COD cr 550-25 322 mg/L, oily substances content 0-1 264 mg/L, suspended solids content 1 800-27 000 mg/L, and volume % of residue sludge after adding coagulant and centrifuge for 1 min 3.87-20%. It is shown that PAC is the most effective coagulant with dosage increasing with increasing sludge and oil contents in the wastewater; the wastewater can be effectively separated into water, oil, and sludge containing 86.2-95.4% of water by using following treatments: the wastewater of sludge content <6% is mixed with proper amount of PAC only and the sedimentation proceeds in 15-20 min; the wastewater of sludge content 6-15% is mixed with PAC and coagulant aim PAM in combination and sedimentates for 20-25 min; the wastewater of sludge content >15% is treated by PAC and PAM and centrifuged for >5 sec at centrifugal factor 2 800.更多还原