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针对我国村镇地区广泛采用的三圆式一体化净水装置处理效果差、出水水质无法保障以及重建困难等问题,以福州某三圆式一体化净水装置为改造对象,分析了其存在的问题并提出了相应的改造措施,即采用机械搅拌混合替代原管式静态混合,同时对运行参数进行优化,考察了混凝剂种类、搅拌转速、混凝剂投加量和处理负荷等对去除效果的影响。三圆式一体化净水装置运行时,混凝剂宜选用液态聚合氯化铝(PAC);机械混合的速度梯度(G值)取500 s-1时沉淀和过滤效果较好,出水浊度由改造前的0.8 NTU以上降至0.13 NTU;就试验期间的原水水质(9.0~10.0NTU)而言,混凝剂的投量宜控制在4 mg/L左右;为保证一体化净水装置的净水效果,宜降低处理负荷,同时还可采用提高搅拌G值(增大絮体的密实度)、污泥回流等措施。
In view of the problems of poor treatment effect, unable to guarantee the quality of effluent water and difficulty of rebuilding which are widely used in villages and towns in our country, the problems existed in Fuzhou, a three-circular integrated water purification device, are analyzed And put forward the corresponding transformation measures, that is, the use of mechanical mixing instead of the static mixing of the original tube, while optimizing the operating parameters, investigated the type of coagulant, stirring speed, coagulant dosage and processing load on the removal effect Impact. Three rounds of integrated water purification device operation, the coagulant should use liquid polyaluminum chloride (PAC); mechanical mixing speed gradient (G value) to take 500 s-1 precipitation and filtration effect is better, the water turbidity From 0.8 NTU before the transformation to 0.13 NTU. For the raw water quality (9.0 ~ 10.0 NTU) during the experiment, the dosage of coagulant should be controlled at about 4 mg / L; in order to ensure that the integrated water purification device Water purification effect, should reduce the processing load, but also can be used to improve the stirring G value (increase the density of floc), sludge reflux and other measures.