为分析七格污水处理厂提标改造对钱塘江河口水质的改善情况,利用MIKE21建立了钱塘江河口闸口至盐官的平面二维潮流和水质模拟分析模型。模型验证后,选取90%保证率枯水年的实测河道地形和大潮期实测潮位过程,分析了七格污水处理厂提标改造工程对钱塘江河口水质变化的影响。结果表明：七格污水处理厂提标改造后,钱塘江河口NH3-N劣于Ⅱ,Ⅲ,Ⅳ类限值的最大影响范围分别减少了约22%,89%和50%,最大值和平均值分别降低了约21%和10%；TP劣于Ⅱ,Ⅲ,Ⅳ类限值的最大影响范围分别减少了约19%,85%和33%,最大值和平均值分别降低了约22%和7%；而CODMn劣于Ⅱ,Ⅲ,Ⅳ类限值的最大影响范围分别减少了约84%,0%和0%,最大值和平均值分别降低了约7%和3%。七格污水处理厂的提标改造可有效削减排入钱塘江的污染物总量。%To analyze the positive effect on water quality of Qiantang River Estuary by raising discharge standards of Qige Wastewater Treatment Plant, a two-dimensional tidal and water quality model for Qiantang River Estuary from Zhakou to Yan-guan is established with MIKE21. After model validation, choosing the field survey data of riverbed terrain and spring tide level under assurance rate of 90% dry years as calculation condition of this model, the water quality variation of Qiantang River estuary is analyzed. The results show that after raising discharge standards of the plant, the maximum impact areas of NH3 -N concentra-tion worse thanⅡ,Ⅲ and Ⅳ limits decrease 22%, 89% and 50% respectively, the maximum and average concentrations de-crease 21% and 10%;the maximum impact areas of TP decrease 19%, 85% and 33% respectively, the maximum and average concentrations decrease 22% and 7%;the maximum impact areas of CODMn decrease 84%, 0% and 0% respectively, the maxi-mum and average concentrations decrease 7% and 3%.
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