An integrated method for controlling the offensive odor and suspended matter originating from algae-induced black blooms. (April 2019)

• Record Type: Journal Article
• Authors: Chen, Chao; Shi, Xiaoli; Yang, Zhen; Fan, Fan; Li, Yunxiang
• Is Part Of: Chemosphere. Volume 221(2019)
• Page Start: 526
• Page End: 532
• Publication Date: 2019-04
• Subjects: Black blooms -- Drinking water -- Hydrogen peroxide -- Modified clay -- Odor; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.01.072
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Potentially toxic algae-induced black blooms can trigger crises in urban water supplies and have fatal effects on aquatic ecosystems. Urgent disposal methods to mitigate the taste and odor are imperative for ensuring the safety of the drinking water supply. In this study, we tested three oxidants and two flocculants to improve water quality after the occurrence of a black bloom. The results indicated that a two-step integrated treatment process is efficient as an urgent disposal measure. The first step is removal of volatile organic sulfide compounds (VOSCs) through the addition of H2 O2 . A total of 50 mg/L of H2 O2 can largely decrease the concentrations of dimethyl trisulfide and related alkyl sulfide compounds in the water column. The second step is the flocculation and sedimentation of black-bloom-induced black matter via a chitosan-modified clay. The addition of 1 g/L of an attapulgite clay plus 10 mg/L of chitosan can effectively deposit suspended matter on the bottom of the water column and have a positive effect on the removal of nutrients. Highlights: An integrated treatment process is proposed to treatment algae-induced black blooms. Oxidants can successfully remove the volatile organic sulfides (VOSCs) in water. Chitosan-modified clay can effectively deposit the black matter to water bottom.