Ozone Oxidation of Anaerobic Digested Piggery Wastewater MBR Treated Effluent for Decline of Organic Matters and Chromaticity to Remove Nitrogen with Microalgae Cultivation

Title
Ozone Oxidation of Anaerobic Digested Piggery Wastewater MBR Treated Effluent for Decline of Organic Matters and Chromaticity to Remove Nitrogen with Microalgae Cultivation
Authors
최욱진채아나김한수송경근
Keywords
Piggery wastewater treatment; ozone oxidation; microalgae; chromaticity
Issue Date
2013-09
Publisher
IWA-ASPIRE 2013
Abstract
Anaerobic digested piggery wastewater has high concentration of pollutant such as suspended solids, organic matters, nitrogen, phosphorous and etc. In the point of view on nitrogen removal, traditional biological nitrogen removal processes are sequential nitrification followed by denitrification. These processes have disadvantages against energy consuming in nitrification process, furthermore keeping anoxic condition in the denitrification process. Microalgae are autotrophic microorganisms consuming carbon, nitrogen and phosphorous in photosynthesis and metabolisms. Microalgae directly uptake nitrogen and then synthesis protein for grow and propagation. Hence microalgae can be applied to the end of treatment system moreover produced biomass can be utilized as biofuels, natural dyes and animal feed. Microalgae cultivation with MBR effluent of anaerobic digested piggery wastewater has economic competitiveness by decreasing production cost, compared with commercial medium using for cultivation. The critical problem of microalgae cultivation with the MBR effluent having high levels of chromaticity is light blocking against microalgae photosynthesis. The inactivity of photosynthesis affect to nitrogen removal efficiency as decrease microalgae cell viability, so the chromaticity should be declined to optimal condition. In this study, the ozone oxidation method used to remove chromaticity. The ozone gas was generated by LAB2B ozone generator (Ozoniakorea, Korea) with pure oxygen (above 99.9%). The contact reactor (60mm inner diameter and 430mm height) made with acryl. The oxidation reaction temperature was 15ºC and reaction periods were 0, 5, 10, 15 and 20minute. Microalga strain Scenedesmus quadricauda (KCTC AG 10032) was used for the study. The strain was obtained from the Biological Resources Center (BRC) of the Korea Research Institute of Bioscience and Biotechnology (KRIBB).
URI
http://pubs.kist.re.kr/handle/201004/47056
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KIST Publication > Conference Paper
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