油田废水 oil field wastewater ; oily wastewater ; oil field sewage

荒废的田野 Abandoned farmland

沙田废物转运站 sha tin Refuse Transfer Station

废水灌溉农田 Wastewater Irrigation

油田废水处理技术 oilfield wastewater treatment technology

油田含聚废水 oil wastewater with PAM