| Title |
Comparisons of Physical and Chemical Methods for Dealing with Biologically Pre-Treated Livestock Wastewater as a Post-Treatment |
| Authors |
최용수 ( Choe Yong Su ) ; 홍석원 ( Hong Seog Won ) ; 권기한 ( Kwon Gi Han ) ; 정일호 ( Jeong Il Ho ) |
| Keywords |
Biologically Pre-treated Livestock Wastewater; Color; Non-biodegradable Organic Matters; Phosphorus; Physicochemical Technologies |
| Abstract |
The combination of biological and physical/chemical technologies is a promising technique to reduce highly concentrated pollutants in livestock wastewater. It is suggested to treat livestock wastewater efficiently as follows: firstly, biodegradable organic matters, nitrogen and some of phosphorus should be removed by a biological treatment process and then residual non-biodegradable organic matters, color and phosphorus be eliminated by physicochemical technologies. In this study, therefore, the integrations of chemical coagulation, activated carbon adsorption, Fenton oxidation and ozonation were evaluated to provide appropriate post-treatment processes for biologically pretreated livestock wastewater. After chemical coagulation followed by ozonation or Fenton oxidation process, the quality of treated wastewater could meet the discharge limit in Korea. However, a yellowish brown color still remained in the treated wastewater after a single method such as coagulation and Fenton oxidation was applied. The ozonation was found to be the most effective technology for the decolorization. Neither simple biological nor physicochemical treatment provides adequate decolorization and sufficient depletion of organics in livestock wastewater so far. Consequently, the integration of Fenton oxidation and ozonation with a biological treatment process is recommended to treat livestock wastewater in terms of removal efficiency. |