高浓度钻井废泥浆处理工艺的试验研究

EXPERIMENT ON TREATMENT PROCESS OF WASTE DRILLING MUD WITH HIGH CONCENTRATION

为实现钻井泥浆无害化处理,提出了"酸化破胶-固液分离-催化氧化-微生物降解"的处理方法,并采用钻井现场废泥浆进行了系列试验研究。结果表明:泥浆密度调节为1.15 kg/dm3,酸化pH≤3,固液分离效果最佳;过滤分离后固相浸毒液达到国家排放标准;液相经Fenton氧化、微生物降解后,COD将降低到110 mg/L以下。该方法运行成本低,处理彻底无隐患,为进一步工业化试验奠定了基础。

In order to implement harmless treatment of waste drilling mud,a new process was proposed,including acidifying-demulsifying,solid-liquid separating,catalyzing-oxidizing and bacteria degrading.The treatment experiments with waste drilling mud indicated that efficient separation of the mud was achieved when the specific gravity was 1.15 and pH was less than 3,the leaching liquid of solid phase met the Integrated Wastewater Discharge Standard（GB 8978-1996） and, through further Fenton oxidation and biodegradation,the COD in filtrate was finally degraded to less than（110 mg/L.） The treatment process lays a foundation for further industrial test with its advantage of low cost and no hidden troubles.