Guangdong Technology Research Center for Marine Algal Bioengineering, Longhua Innovation Institute for Biotechnology, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, P. R. China.
Shenzhen Key Laboratory of Marine Bioresource & Eco-environmental Science, Shenzhen University, Shenzhen, 518060, P. R. China.
Ecotoxicology. 2021 Jul;30(5):945-953. doi: 10.1007/s10646-021-02392-8. Epub 2021 Mar 31.
Phyllodiaptomus tunguidus and Heliodiaptomus falxus are dominant copepods species in drinking water processing plants in southern China. With a potential penetration risk, the breeding and leakage of copepods are drawing more and more attention in recent years. The current study provided a thermal treatment method to control copepods and their eggs. Results showed that: (1) the immediate death rates of P. tunguidus and H. falxus after heated to 34-40 °C for 5 min are positively correlated to the treatment temperatures (P < 0.01), and all individuals of the both species were eliminated after heated at 40 °C for 5 min; (2) overall hatching rates of P. tunguidus eggs were negatively correlated with treatment temperatures (P < 0.01) between 39-45 °C, with zero percent hatched after treatment at 45 °C for 5 min; (3) hatching rates of H. falxus were negatively correlated with treatment temperatures (P < 0.01) between 37-41 °C, with no nauplii hatched when treated at 41 °C for 5 min; (4) paraffin section histological examination indicated that thermal treatment caused severe damage to internal organs and egg structure. Finally, based on the experimental data, the application of the thermal treatment method was discussed in ozonation combined with biological activated carbon (O/BAC) processing of drink water treatment.
中国南方饮用水处理厂的优势桡足类物种为狭长真剑水蚤和弯额象鼻溞。近年来，由于桡足类具有潜在的穿透风险，其繁殖和泄漏受到了越来越多的关注。本研究提供了一种热处理方法来控制桡足类及其卵。结果表明：（1）狭长真剑水蚤和弯额象鼻溞在 34-40°C 加热 5min 后的即时死亡率与处理温度呈正相关（P<0.01），两种生物在 40°C 加热 5min 后全部死亡；（2）在 39-45°C 之间，狭长真剑水蚤卵的总孵化率与处理温度呈负相关（P<0.01），5min 处理 45°C 后孵化率为零；（3）在 37-41°C 之间，弯额象鼻溞的孵化率与处理温度呈负相关（P<0.01），5min 处理 41°C 时无无节幼体孵化；（4）石蜡切片组织学检查表明，热处理对内脏器官和卵结构造成严重损伤。最后，根据实验数据，讨论了该热处理方法在臭氧生物活性炭（O/BAC）联合饮用水处理中的应用。
