【摘要】 采用传统折板絮凝池处理低浊水时面临絮体沉降性差、"跑矾"等现象。为解决上述问题,宁夏某水厂采用微涡旋絮凝工艺对折板絮凝池进行升级改造,但改造完成后的运行效果仍不理想。通过分析对比微涡旋絮凝池和折板絮凝池中的颗粒数、浊度、絮体沉降体积、分形维数、分子荧光光谱等,讨论现有微涡旋改造的不足,并建立一套评价体系,以指导水厂的升级改造。试验结果表明:经过微涡旋改造后除第二絮凝段外,其他各段对浊度的去除率分别提高了8.7%、6.7%、6.5%、56.1%,絮体颗粒数分别降低了20.8%、14.7%、25.2%、48.4%;第二絮凝段由于布水方式和填加微涡旋球过多(水力扰动过大、短流)等问题,使得絮体的形成受到影响,对浊度和颗粒数的去除率相比折板絮凝池无明显提高。所采用的评价指标能够评价水厂微涡旋改造,具有广泛的应用性,为今后水厂的升级改造提供了良好的评价体系。更多还原

【Abstract】 Poor settleability of flocs and alum loss took place in the treatment of low turbidity water using traditional folded plate flocculator. To solve these problems,micro-eddy flocculation was used to upgrade the folded plate flocculator in a water treatment plant. However,the operation efficiency after the upgrade was low. The particles content,turbidity,settling volume of flocs,fractal dimension and EEM were used to estimate the deficiencies of micro-eddy flocculation. The experimental results showed that except for the second flocculation section,the removal rates of turbidity in the other four sections increased by 8. 7%,6. 7%,6. 5% and 56. 1%,and the amounts of particles decreased by 20. 8%,14. 7%,25. 2% and 48. 4%,respectively. The formation of flocs in the second flocculation section was affected by water distribution pattern and adding excessive micro-eddy balls( excessive hydraulic disturbance and short circuiting). The estimation method can assess the upgrade of water treatment plants,and has broad applicability.更多还原