เชื้อราไคโตซาน
ผลกระทบของการใช้ปุ๋ยชีวภาพ
Surface water are frequently subjected to problems of algal blooms and release of algae organic matter
(AOM) from the algae cells, which cause many water quality issues. This study investigated the formation
of organic chloramines and nitrogenous disinfection by-products (N-DBPs) during chlor(am)ination and
UV/chlor(am)ination of AOM in drinking water. AOM caused higher organic chloramine formation than
humic acid and fulvic acid during chlor(am)ination. The formation of organic chloramines increased first
and then decreased with the increase of free chlorine dosage, but kept increasing with the increase of
NH2Cl dosage. During AOM chlorination, the formation of organic chloramines kept decreasing as the
reaction time went by, and the maximum organic chloramine proportion (79.1%) in total chlorine
occurred at 8 h. However, during AOM chloramination, the formation of organic chloramines increased
first, decreased in the following and then increased again as the reaction time went by, and the
maximum organic chloramine proportion (22.1%) in total chlorine occurred at 24 h. UV irradiation
pretreatment did not effectively influence organic chloramine formation during AOM chlor(am)ination,
but accelerated the degradation of organic chloramines during chloramination. Besides, UV pretreatment
enhanced the formation of N-DBPs during the subsequent chlor(am)ination of AOM, especially
dichloroacetonitrile.