阶梯式溢流堰对不同浓度污染水体的影响研究

定期监测45°阶梯式溢流堰坝体上下的溶解氧及水质指标变化,研究阶梯式溢流堰对不同浓度污染水体有机污染及营养盐的影响.结果表明,水体经45°阶梯式溢流堰后,IMn、NH3-N、TP得到有效降低,当坝上的IMn低于19.00 mg·L-1,IMn降低率较高,高于5.80%;当坝上的IMn高于19.00 mg·L-1,IMn降低率较低,低于5.80%.当坝上NH3-N质量浓度小于19 mg·L-1时,NH3-N去除率较低,低于5.00%,当坝上水体NH3-N质量浓度大于19 mg·L-1时去除率较高,高于8.00%.水体经溢流堰后TP的降低值与坝上TP质量浓度呈显著的线性关系,线性方程为△TP=0.2015 TPA-0.1999,但坝上TN浓度对TN去除率无直接联系.

EFFECT OF STEPPED SPILLWAY ON CONTAMINATION WATER BODY WITH DIFFERENCE CONCENTRATION

he influence of the stepped spillway on organic contaminants and nutrients was studied by fixing two sample points of the 45° stepped spillway and monitoring the change of the dissolved oxygen and the water quality change timely. It indicated that the content of I_(Mn), NH_3-N, TP reduces after the stepped spillway when the content of I_(Mn) under 19.00 mg·L~(-1), the rate of depress is greater than 5.80%; when the content of I_(Mn) exceeds 19.00 mg·L~(-1), the rate of depress is lower than 5.80%. when the content of NH_3-N under 19.00 mg·L~(-1), the rate of depress is lower than 5.00%, the content of NH_3-N exceeds 19.00 mg·L~(-1), the rate of depress is greater than 5.00%. the relationship of the added value and the TP concentration of the peak at the spillway is linear, the linear equation is ΔTP = 0.2015 TPA-0.1999,the TN concentration of the peak at the spillway is not connection to the change of the TN.