河岸材料对河流有机污染物净化能力的影响

在河流水质号模型(RWQM1)的基础上,根据河岸材料影响河流对有机污染物净化能力的机理,建立了"简化河流水质1号模型"(S-RWQM1),并利用该模型模拟受河岸材料影响的生物化学反应过程,以及分析河岸材料及水体中微生物含量、代谢状况、有机污染物降解率与模型参数的相关性。对S-RWQM1的动力学参数进行灵敏度分析,发现对CODCr组分中易生物降解溶解性有机物Ss以及异养菌XH模拟计算结果影响较大的参数分别为异养菌好氧生长速率常数Kgro,H,aer,T0、异养菌好氧内源呼吸速率常数Kresp,H,aer,T0。相关性分析结果显示,以釉面瓷砖、透水砖、松木片为河岸材料的微生物脂磷含量、甲基萘醌与泛醌的摩尔比值MK/UQ、有机污染物降解率与模型参数中Kgro,H,aer,T0的相关系数分别为0.995、-0.904、0.988;格宾护岸的微生物脂磷含量、有机污染物降解率与Kgro,H,aer,T0的相关系数分别为0.862、0.990,与Kresp,H,aer,T0的相关系数分别为0.951、0.997。通过调整Kgro,H,aer,T0以及Kresp,H,aer,T0值,可提高CODCr模拟精度。结果表明,S-RWQM1可较好地反映河岸材料对水体中有机污染物净化能力的影响。

Effect of Riverbank on River Self-purification of Organic Contaminants

On the basis of river water quality model No. 1 （RWQM1）, according to the mechanism of river self-purification capacity affected by riverbank, a simplified RWQM1（S-RWQM1） is established to simulate the biochemical reaction process of organic contaminant degradation in rivers and analyze the correlation between riverbank, content and metabolism status of microbial in water, organic contaminant degradation ratio and model parameters. Sensitivity analysis is performed to the kinetic parameters of S-RWQM1, The simulation results show that with regard to the components of CODCr such as biodegradable dissolved organic matter Ss and heterotrophic bacterium XH, the hetemtmphic aerobic growth rate constant kreap,H,aer,T0 affects the content of Ss and the hetemtrophic aerobic endogenous respiration rate constant kreap,H,aer,T0 affects the content of XH significantly. Results from correlation analysis indicate that the correlation ceefficients of model parameter kgro,H,aer,T0 and lipid phosphorus content of microbial, MK/UQ value, and organic matter degradability affected by ceramic glaze, permeable bricks and pine piles as the riverbank materials are 0.995, -0.904 and 0.988 respectively. The correlation coefficients of kgro,H,aer,T0 and lipid phosphorus content of microbial and organic matter degradability affected by gabion revetment are 0.862 and 0.990 respectively and those of kreap,H,aer,T0 are 0,951 and 0.997 respectively. Simulation accuracy of CODCr can be improved by adjustment of kgro,H,aer,T0 and kreap,H,aer,T0. Therefore, it can be concluded that S- RWQM1 presents a good simulation result of the effect of riverbank on river self-purification of organic contaminants.