Effect of pre-chlorination on surface-adsorbed organic matter and coagulation for algae removal in water transportation
Aiming at the pre-chlorination,a commonly used pre-oxidation method,the pivotal role played by surface-adsorbed organic matter(S-AOM)in this process on Microcystis aeruginosa was studied,the influence of S-AOM and algal oxidative stress on coagulation for Microcystis aeruginosa removal was also investigated.The results showed that pre-chlorination could determine the optimal chlorine dosage for achieving moderate pre-chlorination.Moderate pre-chlorination effectively promoted the desorption of S-AOM without causing harm to algal cells,thereby enhanced the subsequent coagulation-based algal removal.In addition,that algal cells subjected to moderate pre-chlorination might undergo programmed cell death during long-distance water transmission,and the continual leakage of intracellular organic matter occurred,which could still adversely affect the efficiency of algal removal during water treatment.Therefore,the programmed cell death of algal cells caused by pre-chlorination emerges as a critical factor to consider in enhancing coagulation-based algal removal processes.
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