Abstract:

In this study, the effects of different coagulants(FeSO₄, PAC, and PFS), dosage of coagulant, initial pH, and PAM on the supernatant turbidity, total organic carbon(TOC), and mud settling ratio were experimentally investigated using mud wastewater from a practical drilling site in Tianjin Province. The process parameters were optimized. The results showed that the coagulation performance by PAC was better than those by FeSO₄ and PFS. As the PAC dosage was 200 mg/L and the initial pH was 10.0, the supernatant turbidity was reduced to 28.3 NTU and the removal of TOC was 91.5% after settling for 30 min. Based on the economic analysis, the cost of PAC is about 0.52 yuan/m³, which has a favorable feasibility of application. Moreover, the addition of PAM could reduce the mud settling ratio, but increase the supernatant turbidity.

Key words: drilling wastewater, coagulation treatment, PAC, turbidity, total organic carbon

摘要：

以天津某钻井作业场地泥浆废水为研究对象，研究了不同混凝剂（FeSO₄、PAC、PFS）、混凝剂投加量、初始pH，助凝剂PAM的投加对混凝处理后上清液浊度、TOC和泥浆沉降比的影响，优化确定了混凝处理的最佳工艺参数。结果表明，PAC对泥浆废水混凝处理的效果优于FeSO₄和PFS，当PAC投加量为200 mg/L，废水初始pH为10.0时，混凝处理静置30 min后，上清液浊度可降至38.3 NTU，TOC去除率可达91.5%，处理药剂成本约为0.52元/t，具有较好的应用可行性。此外，虽然PAM的投加能够降低泥浆沉降比，但会造成上清液浊度升高。

关键词: 钻井废水, 混凝处理, 聚合氯化铝, 浊度, 总有机碳

CLC Number: 

• X703