供水系统摇蚊污染的微生物控制实验研究

A Study on Microbiological Control on Chironomid Pollution in City Water Supply

摘要:

为了研究微生物防治对水厂摇蚊污染的控制效果，测定了一种苏云金杆菌以色列亚种（Bacillus thuringiensis subsp.israelensis，Bti）制剂对摇蚊的LC₅₀，并利用其对某水厂沉淀池孳生的摇蚊进行了现场控制试验。结果表明，Bti粉剂对摇蚊的LC₅₀为0.318mg/L，使沉淀池中摇蚊幼虫在24 h得到了有效控制，成虫在36 h后得以完全控制。该制剂对摇蚊的控制时效达10周，且控制成本是采用液氯费用的1/3，采用微生物手段能使供水系统的摇蚊污染得到高效、经济的治理。

Abstract:

Aimed at effect of microbiological control on Chironomidae in water plants，LC₅₀ of a produce of Bacillus thuringiensis subsp. iaraelensis (Bti) on Chironomus was tested，and a spot experiment was carried through in a water plant polluted by Chironomus.Resultes showed，LC₅₀ of Bti on Chironomus was 0.318mg/L，Chironomus Larvae were killed by Bti in 24 hours，adults cleared away in 36 hours，and the sedimentation tank had been kept from Chironomid pollution for longer than 10 weeks.The charge of microbiological-control on Chironomid pollution is third of that of chlorine.It is indicated that microbiological control is effective and ecnomic in Chironomid pollutioncontrol in city water supply.