Comparison of coagulation pretreatment of produced water from natural gas well by polyaluminium chloride and polyferric sulphate coagulants
| Autor: | Md. Hasibur Rahaman, Haiwen Xiao, Wang Kunping, Hongpu Ma, Huang Zejin, Jun Zhai, Zhiyong Luo, Yue Li, Mei Longyue, Hu Xuebin |
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| Rok vydání: | 2016 |
| Předmět: |
Polyacrylamide
Color Industrial Waste Aluminum Hydroxide 02 engineering and technology 010501 environmental sciences Natural Gas 01 natural sciences Ferric Compounds Waste Disposal Fluid Water Purification chemistry.chemical_compound 020401 chemical engineering Natural gas Environmental Chemistry Coagulation (water treatment) Oil and Gas Fields 0204 chemical engineering Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Total organic carbon Biological Oxygen Demand Analysis Suspended solids Chromatography business.industry Chemical oxygen demand Cationic polymerization Flocculation General Medicine Hydrogen-Ion Concentration Produced water Carbon chemistry business Water Pollutants Chemical |
| Zdroj: | Environmental technology. 38(10) |
| ISSN: | 1479-487X |
| Popis: | This study aimed to optimise coagulation pretreatment of the produced water (PW) collected from a natural gas field. Two coagulants, polyferric sulphate (PFS) and polyaluminium chloride (PACl), were applied separately for the organics, suspended solids (SS), and colour removal. Treatment performance at different coagulant dosages, initial pH values, stirring patterns, and the addition of cationic polyacrylamide (PAM) was investigated in jar tests. The optimal coagulation conditions were dosage of PACl 25 g/L or PFS 20 g/L with that of PAM 30 mg/L, initial pH of 11, and fast mixing of 1.5 min (for PACl) or 2 min (for PFS) at 250 rpm followed by slow mixing of 15 min at 50 rpm for both coagulants. PACl performed better than PFS to remove chemical oxygen demand (COD), total organic carbon (TOC), SS, and colour, and achieved a removal efficiency of 90.1%, 89.4%, 99.0%, and 99.9%, respectively, under the optimal condition; while PFS efficiency was 86.1%, 86.1%, 99.0%, and 98.2%, respectively. However, oil removal was higher in PFS coagulation compared to PACl and showed 98.9% and 95.3%, respectively. Biodegradability, ratio of the biological oxygen demand (five-day) (BOD |
| Databáze: | OpenAIRE |
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