沸石覆盖原位控制湖泊内源中等活性有机磷迁移转化

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pH值试验水体沉积物中内源MLOP相对浓度为:MLOP/TP]pH8>MLOP/TP]pH7>MLOP/TP]pH6;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=1.0884MLOP/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.

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

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 pH conditions, were MLOP/TP]pH8＞MLOP/TP]pH7＞MLOP/TP]pH6; 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 was 0.9709); 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=1.0884MLOP/TP]anaerobic -0.0271(R2 was 0.99895); 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.