原位营养盐传感器在线自动过滤系统设计

Design of online automatic filtration system for the in-situ nutrient salt sensor

针对小流量营养盐分析传感器运行中过滤器件污染堵塞的问题,设计了一种反冲式营养盐在线过滤系统。过滤元件应用微孔陶瓷滤芯,系统采用二级进样、二级过滤、滤液定期反冲的总体方案,并确定了过滤参数。实验结果表明,过滤系统出水浊度稳定,在0.2~0.3 NTU之间,适用范围在150 NTU以下,过滤后5项营养盐回收率基本都在90%~110%之间。

The analysis sensor for small flow nutrient salt has the problem of fouling and clogging of filter parts during operation.To solve this problem,a counter-flushing type of on-line filtering system for nutrient salt was designed.The microporous ceramic filter core was used as the filter element,and an on-line filtration system with secondary injection,secondary filtration,and periodic recoil was proposed,which was based on the existing filtering methods.In addition,working principle and process were described in this article,and the filtering parameters were determined.The experiment results showed that effluent turbidity of the filtering system was stable,basically between 0.2 - 0.3 NTU,the system was effective below 150 NTU.After filtration,the recovery rates of 5 nutrients were basically between 90% and 110%,which indicated that this on-line filtration system could be used for in-situ nutrient salt sensor.