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1、气浮法用于水厂改造及工程实例介绍论文摘要:本文以两个工程实例,具体地介绍了用气浮工艺改造采用混凝-沉淀-过滤工艺水厂的技术方法及效果。工程实践表明,气浮工艺用于水厂改造,具有实用性强,应用面广、投资少、见效快等特点,可作为处理微污染江河饮用水的一种备选方法。对于缓解由于水源污染而造成的处理难度,改善供水水质,降低制水成本.freelg/l降至1.70mg/l后,气滤池周期仅缩短18%,而滤池则缩短39%。表1气浮过滤试验综合测试表序号测试指标浊度(度)色度(度)臭味(级)CODCr(mg/L)氨氮(mg/L)藻数,去除率(万个/L,%)滤速(m/h)周期(h)冲洗水比耗(m3/万m
2、3)操作条件气浮电耗(度/万m3)成本降低(万元/万m3)1原水8.617.5325.000.4025.4146.46312.68沉淀水6.616.1320.000.3022.3,12.2矾5.0mg/L过滤水4.114.3211.000.2515.7,29.911.64.1984.02气滤水1.311.615.000.198.9,60.111.618.8214.60回流比10.0%2原水11.017.5327.000.5530.2矾4.1mg/L回流比10.5%153.79168.39沉淀水6.317.0323.00.3026.4,12.6过滤水4.112.4215.00.051
3、7.3,34.511.06.3675.33气滤水1.59.915.000.038.2,67.011.020.6206.533原水8.017.5326.500.2548.0矾1.7mg/L回流比12.0%175.75346.41沉淀水6.617.5321.300.2045.0,6.3过滤水3.315.3218.500.0442.0,6.711.33.81089.89气滤水1.511.614.000.0314.0,66.911.216.7250.214原水13.530.0430.003.0042.0矾4.0mg/L回流比7.0%102.52880.93沉淀水11.227.9429.50
4、3.0031.2,26.1过滤水5.221.4325.502.9020.0,35.511.41.33157.89气滤水3.319.8218.001.5012.8,59.011.13.51204.635原水15.030.7328.007.00148沉淀水7.930.7324.007.0033.2,.freelg/L过滤水4.122.0320.006.0043.6,11.74.2952.38气滤水11.814.8212.003.0010.8,67.511.016.0265.91回流比12.0%175.75199.36气滤水22.519.8215.004.0016.8,49.411.69
5、.6420.267.4%108.38272.876原水70.027.5456.008.001500.7沉淀水12.927.5424.007.5041.3,72.5矾6.6mg/L过滤水6.120.5320.007.5041.3,0.0012.00.75571.43气滤水14.118.0216.005.5021.9,47.012.02.01950.00回流比7.0%102.521681.45气滤水22.115.7212.003.5016.8,59.310.98.5505.1310.0%146.462375.187原水51.035.0340.005.00105.2沉淀水12.725.5
6、38.004.8076.8,23.0矾6.6mg/L过滤水4.821.228.004.8028.0,63.512.10.84834.71气滤水13.018.024.003.5012.8,83.312.25.7672.99回流比10.0%146.461940.99气滤水21.81524.003.5010.4,87.011.512.0339.1312.0%175.752101.04除沉淀水水质外,影响回流比的主要因素是滤速。对比现行《室外给水设计规范》(BGJ13-86)规定,气浮池向下流速一般采用5.40-9.00m/h,回流比为5-10%,溶气压力为0.2-0.4MPa。而本试验中
7、,一般在回流比大于10%的条件下,才能保证气滤水水质以及足够长的过滤周期。其原因除正处于高污染、高藻期外,滤速(等于气浮池向下流速)过大(11-12m/h)是一个主要原因。过大的滤速一方面减少了气泡释放与浮升的时间,同时会在滤料层中产生气阻现象。另一方面浮渣层由于缺乏足够多的气泡顶托,也不易稳定。再由于气滤池改建施工上的原因,难以保证待滤水与溶气水的均匀分布与有效接触,也使回流比增加。因为试验期间正处于用城市供水紧张期,水厂清水池的水位总是处于低线,所以不宜减产进行试