Turning Waste drilling fluids into a new, sustainable soil resources for landscaping
Turning Waste drilling fluids into a new, sustainable soil resources for landscaping
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将废弃钻井液转化为新的、可持续的景观土壤资源
DOI：
10.1016/j.ecoleng.2017.06.026
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发表时间：
2017
影响因子：
3.8
通讯作者：
W. Xiong
中科院分区：
文献类型：
--
作者：
Zhao Xiaoxiao;Liao;Xionghu Zhao;Feng Liu;A. He;W. Xiong
废弃钻井液（WDF）是由具有不同化学和生物特性的不同添加剂组成的复杂混合物，不具有生物降解性，如果不进行任何处置，会严重污染土壤系统。废弃钻井液经过填埋、固化等后期处理后，也对环境和健康存在潜在危害。本文研究了一种可以将废弃水基钻井液转化为环境友好土壤的配方。该处理工艺可实现水基钻井废弃物的无害化处置和有效利用。实验室柱状研究中，通过评估在优质土壤与废钻井液（10：1，wt：wt）混合物上生长的10种植物的发芽时间和生长情况，选择羊茅种子来评价土壤质量。通过正交试验设计，将该配方与从中国天津大港钻井现场收集的钻井废弃物混合作为处理剂。分析包括重金属、化学需氧量 (COD)、可溶性盐含量和 pH 值的评估。提出了配方（20%煤+10%固体污泥+5%木片）作为减少有毒元素浸出和改善工厂建设的低成本策略。从土壤中提取的渗滤液中重金属浓度低于美国环保局 (USEPA) 规定的 EPA 毒性限值。 pH值约为7∼8。COD小于100mg O2/L，可溶性盐含量小于25g/kg。在现场应用中，本研究开发的环保配方已成功应用于大港油田。处理后的废钻井液有利于植物生长（土壤有机质大于30g/kg，孔隙度大于50%）。该处理过程易于操作，成本低廉（<100元/立方米），实现了新的、可持续的园林绿化土壤资源。
Waste drilling fluids (WDF) is a complex mixture of different additives with different chemical and biologic properties, which have no biodegradability and seriously pollute the soil system without any disposal. After the later stage treatments, like landfill and solidification, waste drilling fluids also have potential detrimental to the environment and health. In this paper, a formula has been studied that can turn the waste water-based drilling fluids into an environment friendly soil. The treatment process can realize the harmless disposal and effective utilization of water-based drilling wastes. In the laboratory column study, by assessing the germination time and growth of ten kinds of plants which were grown on the high quality soil mixture with the waste drilling fluids (10:1, wt:wt), the Festuca arundinacea seed was selected to evaluate the quality of the soil. The formulas were used as a treatment agent mixing with drilling wastes collected from drilling well sites in Dagang, Tianjing, China with design of orthogonal experiment. The analysis was comprised of evaluation of heavy metals, chemical oxygen demand (COD), soluble salt content, and pH. The formula (20%coal + 10%solid sludge +5%chips) was proposed as a low-cost strategy to reduce leaching of toxic elements, and improve plant establishment. The concentrations of heavy metals in leachate solution exacting from the soil were lower than the EPA toxicity limit set by USEPA. The pH was approximately 7 ∼ 8. COD was less than 100 mg O2/L and the soluble salt content was less than 25 g/kg. In the Field application, the environment friendly formula developed in this study has been successfully applied to Dagang Oilfield. The treated waste drilling fluids are favorable to the growth of the plants (the soil organic matter is more than 30 g/kg, the porosity is more than 50%). The treatment process is easy to handle, low-cost ( < 100RMB/m3) and realizes a new, sustainable soil resources for landscaping.