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在原水输水管渠中投加粉末活性炭,对污染原水进行预处理,已经成为水源地突发污染事故条件下的应急处理技术手段。本文提出了原水输水渠道中粉末活性炭动态沉降条件下,粉末活性炭—污染物耦合数学模型,以水源地硝基苯浓度超标为例(分别超标2、5和10倍),模拟了粉炭对硝基苯的吸附净化效果。得出基本结论为:粉炭吸附污染物的效果既与水流条件(实际水流剪应力或供水水量)有关,也与输水渠道的断面水深有关。在相同的粉炭投加浓度条件下,水流剪应力越低,断面水深越低,污染物吸附平衡浓度就越高。当水源地水质严重超标时(超标5–10倍),应将增加粉末活性炭投加量作为解决方案;而当水源地水质超标不明显时(超标2倍),可在合理调控供水水量和粉炭投加量的条件下,达到供水水质要求。该研究建立的数学模型,对突发污染事故条件下城市应急供水,具有借鉴意义。
In the raw water pipe ditch add powdered activated carbon, pretreatment of contaminated raw water, water has become a source of emergency pollution accident under the conditions of technical means. In this paper, the mathematical model for the coupling of activated carbon powder and pollutant under the condition of dynamic sedimentation of powdered activated carbon in the raw water supply channel is proposed. Taking the nitrobenzene concentration in the water source as an example (exceeding 2,5 and 10 times respectively) Adsorption purification of benzene. The basic conclusion is that the effect of powder charcoal adsorption on pollutants is not only related to water flow conditions (actual water flow shear stress or water supply amount), but also to water depth of water conveyance channel. Under the same concentration of powdered coal dosing, the lower the shear stress of water flow, the lower the cross-section water depth, the higher the equilibrium concentration of pollutant adsorption. When the water quality seriously exceeded the standard (5-10 times exceed), should increase the dosage of powdered activated carbon as a solution; and when the water quality is not excessive (exceeding 2 times), can be a reasonable control of water supply and carbon powder Dosing conditions, to meet the water quality requirements. The mathematical model established in this study has reference significance to the urban emergency water supply in the event of a sudden pollution accident.