Removal of COD & NH3 from Produced Water using Modified Horizontal Subsurface Flow Constructed Wetlands (HSCW)

A. Effendi, Regi Risman Sandi
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Abstract

It is very common that COD and NH3 are found in Produced Water with elevated concentration. One proven technology that is capable in removing organic substances and nutrients, is Horizontal Subsurface Flow Constructed Wetland (HSCW). Based on characterization of produced water from one oil field in Indonesia, it was shown that COD and NH3 were found to exceed the threshold limit stated in Ministry of Environmental Decree no. 19 Year 2010. Modified HSCWs were developed in order to treat produced water containing high concentration of COD and NH3 and allowing anaerobic process to occur in the reactor. The HSCWs were planted by three different species; they were Sagittaria palaefolia (Jasmine Water), Scirpus grossus (Mensiang), and Typha latifolia (Walingi). Organic loading rates (OLRs) to the HSCWs reactor were varied from 7.2 to 72 gr COD/m2.day. It was found that HSCW planted with Typha latifolia had the highest removal efficiency for both COD and NH3 when the OLR was set at 14.4 gr COD/m2.day. Anaerobic bacteria were found in high number indicating that these bacteria involved actively in removing pollutants containing in produced water. However, further microbiology study should be performed in order to determine the role of anaerobic bacteria.
改良水平潜流人工湿地去除采出水中COD和NH3的研究
采出水中COD和NH3浓度偏高是很常见的现象。水平地下流人工湿地(HSCW)是一种经过验证的能够去除有机物和营养物质的技术。根据对印度尼西亚某油田采出水的表征,发现COD和NH3超过了环境部第7号法令规定的阈值限制。19 2010年。为了处理含有高浓度COD和NH3的产出水,并允许在反应器中进行厌氧处理,开发了改进的HSCWs。三种不同的树种种植了这些高强度植物;它们分别是古叶人马座(Sagittaria palaefolia,茉莉花)、山菖蒲(Scirpus grossus, Mensiang)和大叶Typha latifolia (Walingi)。HSCWs反应器的有机负载率(olr)在7.2 ~ 72克COD/m2.d之间变化。结果表明,当OLR为14.4 g COD/m2.d时,人工种植台柏的HSCW对COD和NH3的去除率最高。厌氧细菌数量较多,表明这些细菌积极参与了采出水中污染物的去除。然而,为了确定厌氧菌的作用,还需要进一步的微生物学研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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2 weeks
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