摘要
西北地区干旱缺水,但油气田外排水产量却呈逐年增加的趋势,外排水生态利用是解决西北地区水资源短缺和外排水处置矛盾的有效策略之一。为此,探究了在湿地和灌溉生态利用模式下水中典型耗氧有机物(以COD计)和石油烃(petroleum hydrocarbon)在荒漠土壤中的迁移和转化规律。原位土壤分层土柱实验结果表明,2种利用模式均会导致土壤中总有机碳(TOC)的含量有不同程度的下降,外排水COD的升高会减缓土壤TOC的流失,但会改变土壤TOC的组成。土壤微生物可有效消减外排水中COD,降低其向土壤深层迁移的风险。TPH易在土壤表层发生累积,但低浓度TPH排放的灌溉模式有利于减少土层中TPH的累积。湿地模式下由于水流量大,增加了TPH向地下水迁移的风险。土壤微生物对TPH的降解率可达15%,并导致C_(25)以下的TPH相对含量显著降低,但C_(26)以上组分的TPH相对含量则有所提升,原因在于短链TPH易被微生物降解,长链TPH不易降解并形成累积。以上研究结果可为油气田外排水生态利用可行性提供数据参考。
Water shortage is the main limiting factor in Northwest China,however,the production of oil and gas field wastewater in northwest China is increasing year by year.The ecological utilization of discharged water is one of the effective strategies to solve the contradiction between water resources shortage and discharged water treatment in northwest China.Therefore,this study explored the migration and transformation of typical oxygen-consuming organic matter(COD)and petroleum hydrocarbon(TPH)in desert soil under wetland and irrigation ecological utilization patterns.In-situ soil column experiments showed that both of the two utilization patterns could lead to the decrease of Total organic carbon(TOC)in varying degrees,the increased COD could reduce the loss of TOC,but would change the composition of TOC.Soil microorganisms could effectively reduce COD in efflux water and reduce the migration risk of COD to deep soil.TPH could accumulate in the surface soil,but the irrigation pattern with low TPH concentration was beneficial to reduce its accumulation.In wetland pattern,large flow increased the risk of TPH migration to groundwater.The degradation rate of TPH by soil microorganisms could reach 15%,resulting in a significant decrease in the relative content of TPH below C_(25),but an increase in the relative content of TPH above C_(26).The reason is that short chain TPH can be degraded by microorganisms easily,while long chain TPH is not easily degraded.The above research results can provide basic data for ecological utilization of oil and gas field wastewater.
作者
黄榜
王琼
刘敬章
杜梅
史斌
刘艳伟
宋茂勇
毕磊
HUANG Bang;WANG Qiong;LIU Jingzhang;DU Mei;SHI Bin;LIU Yanwei;SONG Maoyong;BI Lei(Laboratory of Environmental Nanotechnology and Health Effects,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;School of Environment and Health,Jianghan University,Wuhan 430056,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2023年第5期1717-1725,共9页
Chinese Journal of Environmental Engineering
基金
国家重点研发计划智能人工降解体系应用技术与评估(2018YFA0901200)。
关键词
油气田外排水
生态利用模式
COD
TPH
土壤微生物
oil and gas field wastewater
ecological utilization pattern
COD
TPH
soil microorganism
