Removal of Algae, and Taste and Odor Compounds by a Combination of Plant-Mineral Composite (PMC) Coagulant with UV-AOPs: Laboratory and Pilot Scale Studies

The seasonal occurrence of algae blooms in surface waters remains a common problem, such as taste and odor (T&Os), the risk of disinfection by-products (DBPs), and disturbance to water treatment systems. The coagulation efficiency of plant-mineral composite (PMC) coagulant followed by UV-based a...

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Bibliographic Details
Published in:Applied sciences 2018-09, Vol.8 (9), p.1502
Main Authors: Abrha, Yirga, Kye, Homin, Kwon, Minhwan, Lee, Doorae, Kim, Kiho, Jung, Youmi, Ahn, Yongtae, Kang, Joon-Wun
Format: Article
Language:English
Subjects:
2-MIB
advanced oxidation process
Algae
Alkalinity
Aluminum
Barley
Chlorine
Chlorophyll
Coagulants
Coagulation
Colloiding
Colloids
Drinking water
Efficiency
geosmin
Hydrogen peroxide
Laboratories
Loess
Natural waters
Neutralization
Odors
Oxidants
Oxidation
Oxidizing agents
Photons
plant-mineral composite coagulant
Scavenging
Turbidity
Water quality
Water treatment
Zeolites
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Summary:The seasonal occurrence of algae blooms in surface waters remains a common problem, such as taste and odor (T&Os), the risk of disinfection by-products (DBPs), and disturbance to water treatment systems. The coagulation efficiency of plant-mineral composite (PMC) coagulant followed by UV-based advanced oxidation processes (UV-AOPs; UV/H2O2 and UV/Cl2) was evaluated for removal of algae, turbidity, dissolved organic matters, and taste and odor compounds in lab-scale and pilot-scale tests. In the lab-scale test, coagulation process with 20 mg/L of PMC shows high removal efficiency of turbidity (94%) and algae (99%) and moderate removal efficiency of UV254 (51%) and geosmin (46%). The pilot test results also show good removal efficiency of turbidity (64%), chlorophyll-a (96%). After PMC coagulation process, the major water factors, which affected the performance of UV-AOPs (i.e., UV transmittance (85–94%), and scavenging factor (64,998–28,516 s−1)), were notably improved, and further degradation of geosmin and 2-methylisoborneol (2-MIB) was achieved in both lab-and pilot-scale tests of the UV-AOPs. The UV/H2O2 process shows higher removal efficiency of geosmin and 2-MIB than the UV/Cl2 process because of the pH effect. The results confirmed that the PMC-based coagulation followed by UV/H2O2 process could be an effective process for the removal of algae, geosmin, and 2-MIB.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8091502