共查询到19条相似文献，搜索用时 125 毫秒
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杨长生 《成都航空职业技术学院学报》2008,24(4)
采用两种不同粒径的均质石英砂滤料进行直接过滤,在单位面积滤层滤料表面积相等的条件下进行过滤性能比较,试验结果表明单位面积滤层滤料颗粒表面积相等时,滤后水浊度相同,粗石英砂的过滤水头损失小于细石英砂的过滤水头损失,因此,用单位面积滤层滤料表面积来衡量对滤池滤料的要求比L/d指标更合理。 相似文献
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分别经酸液,碱液和先酸液后碱液浸泡改性的混合石英砂滤料,应用于低浊度低色度原水的微絮凝一直接过滤的饮用水处理.研究表明三种改性对过滤效果的改善呈现先酸后碱液>碱液>酸液>未改性的顺序.过滤前后各项水质指标改善为除色率≈λ254去除率>截污量>除铝率≥除浊率.是石英砂改性的一种值得进一步探究的新办法. 相似文献
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混凝剂的选择是煤泥水处理中最重要的环节,它直接影响着煤泥水的处理效果.混凝剂可以分为无机凝聚剂和有机絮凝剂.本试验以上清液浊度、浑液面沉速和污泥比阻为衡量标准比较了单独使用无机凝聚剂、单独使用有机絮凝剂和联合使用无机凝聚剂与有机絮凝剂三种方法的处理效果.试验数据表明:处理高浓度煤泥水,后两种方法能达到理想的处理效果,并得出了后两种方法的最佳投药量. 相似文献
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介绍了环保陶瓷滤料的特性,分析了其试验数据,从过滤性能和经济效益方面论证了水厂使用环保陶瓷滤料的可行性. 相似文献
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王趁义 《湖州师范学院学报》2008,30(2)
以工业废渣粉煤灰为主要原料,辅以少量试剂,合成了用量少、生产成本低、无毒、性能高的无机高分子混凝剂--聚硅酸硫酸铝,确立了合理的实验条件.混凝沉降实验表明,所合成的聚硅酸硫酸铝混凝剂对于高色度、高浊度废水的混凝沉降效果明显优于传统的无机混凝剂,但其混凝处理效果受废水pH值的影响较大,适宜的pH值范围为5～7. 相似文献
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采用混凝——微滤组合工艺处理电镀含镍废水,考察了酸碱度、混凝剂用量、过滤速度、停留时间对去除效果的影响,确定较佳工艺条件.结果表明：在pH 9.5,较合适混凝剂投加量为800mg/L;较合适过流速度为90ml/min;较合适停留时间为10min,去除率达97%以上.在上述工艺条件下,实际工业废水的去除率为81.36%,说明本工艺对含镍废水处理具有一定指导意义. 相似文献
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采用中速定量滤纸为滤料测定悬浮物时,滤纸上可溶物含量约0．25％,经水过滤后溶解于水,影响测定值．所以滤纸用前先用蒸馏水冲洗过滤几遍,以除去可溶性物质,再烘干至恒重,待用． 相似文献
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YANG Wei CHEN Jie LI Xing LIANG Heng HE Wen-jie LI Gui-bai 《浙江大学学报(A卷英文版)》2007,8(9):1475-1481
Considering that contaminated raw water mostly contains high Ammonia-N and a majority of water treatment plants use prechlorination process in China,efficiency of chloramines as a coagulant aid in enhancing coagulation was investigated by Jar stirring and pilot-scale tests,using Yellow River water containing high concentration of natural organic matters (NOM) and bromide in winter. The jar tests results showed that,compared with no preoxidation,preformed chloramine apparently decreased the turbidity of settled and filtered water with low dosage (2.0 mg/L),and the aid-coagulation efficiency was further enhanced with the increase of chlorine (Cl2) to Ammonia-N (N) ratio. Pilot-scale studies indicated that,in comparison to the case without pre-oxidation,the turbidity removal efficiency of flotation and filtration effluent water was significantly improved,the particle counts of filtered water were decreased 63.4%,the average rate of filter head loss was reduced 18.2%,and filter run time was prolonged 15.7%. Therefore,chloramine preoxidation may substantially enhance the particle separation efficiency. 相似文献
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INTRODUCTION Among methods used for flocculation control by chemical coagulant dosage, are mathematical model, on-site test equipment simulation, stream current measurement, aggregates equivalent diameter detec-tion, etc. (Li and Wilkinson, 2005; Werner et al., 2001); and many apparatus such as zeta potentiometer,stream current detector, photometric dispersion ana-lyzer, particle size analyzer, etc. (Chakraborti et al., 2003; Huang, 2005; Rossi et al., 2002; Swift et al., 2004) were app… 相似文献
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降低循环水场循环水浊度新方法探究 总被引：1，自引：0，他引：1
针对循环水浊度偏高问题,分析造成悬浮物、浊度升高的原因,通过增加隔油池排泥反洗实验,探究降低循环水浊度的新方法,评价排泥反洗中试装置中,浅层压力式过滤罐与滤池降低浊度的效果对比,在加药和不加药两种情况下,浊度和去除率的情况。 相似文献
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In order to remove the low turbidity present in surface water, a novel metal-polysilicate coagulant was used to treat the raw water taken from Tanjiang River in Guangdong Province. This study on the effects of Al/Fe molar ratio on the performance of a complex compound formed by polysilicic acid, aluminium and ferric salt (PAFS) showed that PAFS with Al/Fe ratio of 10:3 seemed to have the best coagulation performance in removing turbidity and color. Experimental results showed that under the conditions of polymerization time of 15 d, sedimentation time of 12 min, and pH of 6(8, PAFS with Al/Fe molar ratio of 10:3 had the best coagulation efficiency and lowest residual Al concentration. The turbidity decreased from 23.8 NTU to 3.23 NTU and the residual Al concentration was only 0.165 mg/L in the product water. It could be speculated that colloidal impurities and particulate Al were removed by adsorption bridging and electrical neutralization of long chain inorganic polymer coagulants. 相似文献
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Study on coagulation property of metal-polysilicate coagulants in low turbidity water treatment 总被引：2，自引：0，他引：2
INTRODUCTION Coagulation-flocculation is a major step inthe potable water treatment for removal of colloi-dal impurity. Due to the increase of water pollu-tion, the standards of drinking water supply andwastewater discharge are becoming more and morestringent, and chemical coagulants that are moreefficient in water treatment are more and moreurgently in demand. As well known, the residual Al in potablewater comes from three main sources: natural wa-ter-body, coagulants used in… 相似文献
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Automatic coagulant dosage control with streaming current (SC) technique is introduced in this paper. Aluminum and ferric coagulants are widely used in surface water treatment. The SC response characteristics of P-AlCl3 aluminum coagulant and P-FeCl3 ferric coagulant were investigated in this work. Bench-scale water treatment results were obtained from jar tests including rapid mixing, flocculation and undisturbed sedimentation. Results showed that aluminum coagulant is more sensitive than ferric coagulant to SC response. 相似文献
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研究了以聚合硫酸铁(PFS)为主凝剂、高取代度季铵型阳离子化玉米淀粉(HQCC)为助凝剂处理城市生活废水的各种影响因素．实验结果表明：PFS和HQCCS分别以200mg／L和10mg／L的复配浓度、pH值接近中性时混凝效果为最佳，CODCr去除率达到80％，色度与浊度去除率均达99％以上． 相似文献
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曝气生物滤池反冲洗污泥的合理处置是其在推广应用中遇到的难题.反冲洗污泥对有机物和浊度有良好的去除效果,但对TP的去除效果甚微;将其与化学混凝剂复配可满足曝气生物滤池进水水质要求,且TP能维持在较低水平. 相似文献