沸石覆盖原位控制湖泊内源中等活性有机磷迁移转化

Influencing factors of zeolite in-situ remediation system to control moderately labile organic phosphorus migration and transformation in shallow water

为揭示湖泊内源中等活性有机磷(MLOP)控制与释放发生机制,采用室内模拟试验,研究沸石覆盖原位控制湖泊内源MLOP迁移转化影响因子.结果表明:酸性水体促进内源MLOP迁移,碱性条件下抑制其转化,不同p H值试验水体沉积物中内源MLOP相对浓度为:[MLOP/TP]p H8>[MLOP/TP]p H7>[MLOP/TP]p H6;温度明显提高内源MLOP迁移水平,低温水体相对高温水体沉积物中内源MLOP含量较低,5℃条件下内源MLOP迁移表观量最大,其随时间迁移量呈幂函数关系,可表示为[MLOP/TP]=0.2823T0.657(R2为0.9709);好氧或厌氧条件下,内源MLOP均发生迁移,且迁移特征和影响效能高度一致,迁移平衡后好氧环境内源MLOP和厌氧内源MLOP相对浓度呈线性相关,可表示为[MLOP/TP]好氧环境=1.0884[MLOP/TP]厌氧环境-0.0271(R2为99895);光照因子促使内源MLOP迁移,而避光和沸石粒径因素对内源MLOP迁移影响较小;底栖生物颤蚓通过爬行、摄食、掘穴、栖所建造及分泌排泄等一系列活动影响内源MLOP迁移.沸石原位控制湖泊内源MLOP迁移转化效能较弱.

To unravel the mechanism of the control and release of the endogenous moderately labile organic phosphorus（MLOP） in the lake,the factor,which influenced the migration and transformation of endogenous MLOP using in-situ zeolite capping control,was studied. The results of the laboratory simulation of in-situ zeolite controling endogenous pollutions in lakes indicate that acidic water bodies promoted endogenous MLOP migration while alkaline conditions hindered it,and the relative concentrations of endogenous MLOP in sediments,under different p H conditions,were [MLOP/TP]p H8[MLOP/TP]p H7[MLOP/TP]p H6; temperature significantly increased the migration level of endogenous MLOD： the content of endogenous MLOP in sediments in low-temperature water bodies was lower than that in high-temperature ones. On condition of 5 ℃,the endogenous MLOP showed the highest apparent migration,and it also presented a power function relationship with the migration over time,which could be described as [MLOP/TP]=0.2823T0.657（R2 was0.9709）; the endogenous MLOP migrated under aerobic or anaerobic conditions; the migration features and the impact performance were highly in accordance. After the migration balance,the endogenous MLOP in aerobic and anaerobic conditions displayed a linear correlation,which could be described as [MLOP/TP]aerobic=1.0884[MLOP/TP]anaerobic-0.0271（R2 was0.99895）; illumination promoted the migration of endogenous MLOP,while dark condition and zeolite particle size showed relatively low influence. The migration and transformation efficiency of endogenous MLOP controlled,in-situ,by zeolite showed to be weak.