Kogbara Reginald B, Dumkhana Bernard B, Ayotamuno Josiah M, Okparanma Reuben N
Department of Agricultural & Environmental Engineering, Rivers State University of Science & Technology, P.M.B 5080, Port Harcourt, Nigeria; Mechanical Engineering Program, Texas A&M University at Qatar, P.O. Box 23874, Education City, Doha, Qatar.
Department of Agricultural & Environmental Engineering, Rivers State University of Science & Technology, P.M.B 5080, Port Harcourt, Nigeria.
Chemosphere. 2017 Oct;184:652-663. doi: 10.1016/j.chemosphere.2017.06.042. Epub 2017 Jun 13.
Stabilisation/solidification (S/S), which involves fixation and immobilisation of contaminants using cementitious materials, is one method of treating drill cuttings before final fate. This work considers reuse of stabilised/solidified drill cuttings for forage production in acidic soils. It sought to improve the sustainability of S/S technique through supplementation with the phytoremediation potential of plants, eliminate the need for landfill disposal and reduce soil acidity for better plant growth. Drill cuttings with an initial total petroleum hydrocarbon (TPH) concentration of 17,125 mg kg and low concentrations of metals were treated with 5%, 10%, and 20% cement dosages. The treated drill cuttings were reused in granular form for growing a forage, elephant grass (Pennisetum purpureum), after mixing with uncontaminated soil. The grasses were also grown in uncontaminated soil. The phytoremediation and growth potential of the plants was assessed over a 12-week period. A mix ratio of one part drill cuttings to three parts uncontaminated soil was required for active plant growth. The phytoremediation ability of elephant grass (alongside abiotic losses) reduced the TPH level (up to 8795 mg kg) in the soil-treated-drill cuttings mixtures below regulatory (1000 mg kg) levels. There were also decreased concentrations of metals. The grass showed better heights and leaf lengths in soil containing drill cuttings treated with 5% cement dosage than in uncontaminated soil. The results suggest that recycling S/S treated drill cuttings for forage production may be a potential end use of the treated waste.
稳定化/固化（S/S）是一种在最终处置前处理钻屑的方法，该方法使用胶凝材料固定和固化污染物。这项工作考虑将稳定化/固化后的钻屑用于酸性土壤中的草料生产。它试图通过补充植物的植物修复潜力来提高S/S技术的可持续性，消除填埋处置的需求，并降低土壤酸度以促进植物更好地生长。初始总石油烃（TPH）浓度为17125mg/kg且金属浓度较低的钻屑，分别用5%、10%和20%的水泥剂量进行处理。处理后的钻屑以颗粒形式与未受污染的土壤混合后，用于种植一种草料——象草（狼尾草）。这些草也种植在未受污染的土壤中。在12周的时间内评估了植物的植物修复和生长潜力。植物要实现活跃生长，需要钻屑与未受污染土壤以1:3的混合比例。象草的植物修复能力（连同非生物损失）使土壤-处理钻屑混合物中的TPH水平（降至8795mg/kg）低于监管水平（1000mg/kg）。金属浓度也有所降低。在用5%水泥剂量处理的含钻屑土壤中生长的草，其高度和叶片长度比在未受污染土壤中生长的草更好。结果表明，将S/S处理后的钻屑回收用于草料生产可能是处理后废物的一种潜在最终用途。
