【摘要】 以广州某净水厂为例,系统分析了进水中砂砾的粒径分布特性及去除情况。结果表明,进水含砂量受季节与降雨影响显著,介于1.38～29.99 mg/L,均值为(7.41±8.92) mg/L,其中粒径小于200μm的砂砾占比达44.70%～52.69%。传统曝气沉砂池对该类细砂的去除效率较低,仅为49.69%～49.98%。为此,研发了新型多层旋流除砂工艺,其对大于200μm和小于200μm砂砾的去除率分别达到(96.85±2.63)%和(93.41±3.00)%,平均沉砂效率较传统工艺提升39.11%～69.54%,且处理成本由0.04～0.07元/m~3降至0.02～0.04元/m~3。在85%～130%设计流量范围内,新型工艺除砂率可持续稳定在90%以上,表现出良好的抗冲击负荷能力与运行稳定性。更多还原

【Abstract】 This study investigates a water purification plant in Guangzhou to analyze the grit particle size distribution in influent and the removal effect. The influent grit concentration, strongly affected by seasonal variations and rainfall, ranged from 1.38 to 29.99 mg/L, with an average of(7.41±8.92) mg/L. Particles smaller than 200 μm accounted for 44.70～52.69% of the total, yet aerated grit chambers removed only 49.69～49.98% of these fine particles. To address this limitation, a multi-layer hydro-cyclone grit removal process was developed, achieving removal performance of(96.85±2.63)% for particles >200 μm and(93.41±3.00)% for particles <200 μm. Compared with the traditional process, its overall grit removal efficiency increased by 39.11～69.54%, while treatment costs decreased from 0.04～0.07 CNY/ton to 0.02～0.04 CNY/ton. Under 85%～130% of the design flow, removal efficiency can be maintained above 90%, demonstrating strong resilience to shock scenarios and operational stability.更多还原