摘要
为测试旋流除砂系统实际性能，采用独有测试技术和方法，对广东司前污水厂设计规模为10000m^3／d的旋流沉砂池进行除砂性能测试，考察了进水水量、搅拌桨转速及高度、气洗强度及气洗时间与除砂效率的关系。结果显示：①系统在设计水量以下运行时，对0．1～0．2mm砂粒的去除率〉75％，当处理水量达到500m^3／h（超过设计水量）时，对0．1～0．2mm砂粒的去除率会大幅降至35．78％；②搅拌桨转速与砂粒去除率呈抛物线关系，在处理水量为200m^3／h、搅拌桨高度为110mm的条件下，对应最佳转速为7r／min，对0．1—0．2mm砂粒的去除率达到91％；③搅拌桨高度为110mm时对0．1—0．2mm砂粒的去除率高于170mm时的；④气洗气量宜取1m^3／min，气洗时间取480S；⑤影响除砂系统性能的因素主次排序为：气洗强度〉进水量〉气洗时间〉搅拌桨转速〉搅拌桨高度。
In order to accurately understand the actual performance of the rotational flow grit removal system, the grit removal efficiency of rotational flow grit chamber with the design capacity of 10 000 m^3/d in Guangdong Siqian WWTP was tested by employing homemade sampling and sedimentation device with artificial adding sand method. The effect of inflow, impeller speed, impeller height, air washing intensity and air washing time on grit removal efficiency was investigated. The results showed that （1） 0.1 to 0.2 mm grit removal efficiency of the system operated under design inflow was more than 75%, while this grit removal efficiency was significantly reduced to 35.78% for 500 m^3/h inflow; （3） grit removal efficiency and impeller speed had parabola relationship. When the system was kept at inflow of 200 m^3/h and impeller height of 110 mm, the optimum impeller speed was 7 r/min, and the 0.1 to 0.2 mm grit removal efficiency was 91% ; （3） 0.1 to 0.2 mm grit removal efficiency at impeller height of 110 mm was higher than that at impeller height of 170 mm; （4） air washing rate should be controlled at 1 m3/min, and air washing time should be controlled at 480 s ; and （5） the sequence of the factors affecting the performance of the grit removal system was： air washing intensity 〉 inflow 〉 air washing time 〉 impeller speed 〉 impeller height.
出处
《中国给水排水》
CAS
CSCD
北大核心
2016年第3期70-74,共5页
China Water & Wastewater
基金
国家高技术研究发展计划(863)项目(2009AA063801)
关键词
旋流沉砂池
除砂效率
搅拌桨转速
气洗强度
rotational flow grit chamber
grit removal efficiency
impeller speed
air washing intensity
