原位营养盐传感器在线自动过滤系统设计

褚东志,张述伟,张天鹏，王小红，曹煊,马然

(山东省海洋环境监测技术重点实验室，山东省科学院海洋仪器仪表研究所，山东 青岛 266001)

原位营养盐传感器在线自动过滤系统设计

褚东志,张述伟,张天鹏，王小红，曹煊,马然

(山东省海洋环境监测技术重点实验室，山东省科学院海洋仪器仪表研究所，山东 青岛 266001)

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。

水质生态监测；在线过滤；营养盐；反冲洗；浊度

Abstract∶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.

Key words∶water quality ecological monitoring；on-line filter；nutrient salt；recoil；turbidity

随着人类海洋活动的日益频繁，海洋事故增多、灾害频发，海洋生态环境堪忧。海水富营养化引起初级生产链变化，浒苔、赤潮严重威胁着水产养殖领域，同时，正在引发海洋生态结构变化，威胁着海洋生态平衡。因此，海水营养盐含量监测十分必要。目前，承担长期监测任务的主流营养盐分析传感器是基于湿化学体系开发的，为节约化学试剂量，小流量监测成为一种趋势。因为监测流路通径变得越来越狭小，流路极易被杂质堵塞，所以对水样实现预过滤显得尤为重要。因此，研发一种适用性强、功耗低、结构相对简单的在线过滤系统，确保营养盐传感器长期有效运行势在必行。……