Abstract
Animal wastewater is one of the wastewaters that has a color and is difficult to treat because it contains a large amount of non-degradable organic materials. The photo-assisted Fenton oxidation technique was applied to treat animal wastewater, and the optimal conditions of chemical oxygen demands (COD) removal were analyzed according to changes in pH, ferrous ion, H2O2, and ultraviolet (UV) light intensity as a single experimental condition. Experimental results showed that, under the single-factor experimental conditions, the optimal conditions for degradation of animal wastewater were pH 3.5, Fe(II) 0.01 M, H2O2 0.1 M, light intensity 3.524 mW/m2. Under the optimal conditions, COD removal efficiency was 91%, sludge production was 2.5 mL from 100 mL of solution, color removal efficiency was 80%, and coliform removal efficiency was 99.5%.
Highlights
IntroductionAnimal wastewater generated in animal breeding facilities such as for cattle and pigs contains a high concentration of non-degradable organic matter, nutrients (nitrogen and phosphorus), and color, which can have a negative effect on the water environment when discharged without being properly processed in the treatment facilities
Animal wastewater generated in animal breeding facilities such as for cattle and pigs contains a high concentration of non-degradable organic matter, nutrients, and color, which can have a negative effect on the water environment when discharged without being properly processed in the treatment facilities
It is necessary to establish appropriate reaction conditions to treat this type of wastewater—that is, a high concentration of organic matter
Summary
Animal wastewater generated in animal breeding facilities such as for cattle and pigs contains a high concentration of non-degradable organic matter, nutrients (nitrogen and phosphorus), and color, which can have a negative effect on the water environment when discharged without being properly processed in the treatment facilities. Animal wastewater has been treated alone or combined with municipal wastewater and night soil in Korea [2] Their treatment capacities are insufficient as compared with animal wastewater generation. Inappropriate disposal of animal wastewater may pose environmental problems such as the accumulation of pollutants in soil and pollution of ground and surface water due to leaching and run-off of pollutants [2]. For this reason, livestock wastewater is considered a main water pollutant source recently in Korea
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