축산폐수처리시화학적전처리가연계처리에미치는영향연구 = A Study on the Effect of Chemical Pretreatment for LivestockWastewater on the Linked Treatment of Sewage

다국어 초록 (Multilingual Abstract)

In this study, to investigate the effect of chemical pretreatment for livestock wastewater,laboratory scale test for ozonation and linked treatment of sewage were conducted. and theresults were obtained as follows. The ozonation of livestock wastewater showed the CODremoval rate per hour to be 17%, 78% and 62% at each pH 4, 7 and 10, respectively. Withtransformation of NBDCOD to biodegradable BDCOD by ozonation, the ratio of SCODcr/TCODcrwas increased from 26% to 38%. Accordingly, pretreatment of livestock wastewater affected tothe biological post treatment process to elevate removal efficiency by transformation of non-biodegradable mass to biodegradable mass. As the results of linked treatment of pre-ozonatedlivestock wastewater and sewage in the MLE process, the treatment efficiencies of TCODcr93.8%, T-N 74.3%, T-P 89.7%, SS 97.5% were earned at 100% of internal recycle rate. Whenthe internal recycle rate was increased to 150%, the treatment efficiencies of TCODcr 94.5%,T-N 54.5%, T-P 70.8%, SS 98.5% were earned. Also the removal efficiencies of TCODcr92.6%, T-N 83.1%, T-P 81.9%, SS 98.5% were earned as the internal recycle rate wasincreased to 200%. Especially, nitrogen removal efficiency in the linked treatment showed74.3%, 54.5%, 83.1% at 100%, 150% and 200% of internal recycle ratio, respectively, whichrevealed the tendency of higher removal efficiency than that of sewage treatment.

국문 초록 (Abstract)

본연구에서는오존을이용하여축산폐수를전처리하고일반하수와연계하여처리하였을때처리효율을실험실규모의장치를이용하여비교·분석하였으며결과는다음과같다. 축산폐수의오존산화결과대상폐수의pH를산성(pH4), 중성(pH7), 알칼리성(pH10)으로변화시켰을때각각COD제거율은시간당17%, 78%, 62% 로분석되었다. 오존산화에의해NBDCOD 중일부가미생물이분해가능한BDCOD 로전환되어SCODcr/TCODcr 비는26%에서약38%로증가하였다. 따라서, 오존산화에의한축산폐수의전처리는난분해성물질을생물학적분해가능한물질로일부전환시키며후단생물학적처리단계에서의제거효율을높일수있는영향을미치는것으로분석되었다. 오존산화처리된축산폐수와하수와의연계유입수를MLE(Modified Ludzack-Ettinger) 공정으로처리한결과, 내부반송100%일때TCODcr 93.8%, T-N 74.3%, T-P 89.7%, SS 97.5%의처리효율을나타냈다. 또한내부반송율을150%로증가시켰을때처리효율은각각94.5%, 54.5%, 70.8%, 98.5% 로나타났고, 200%로증가시켰을때처리효율은각각92.6%, 83.1%, 81.9%, 98.5% 로나타났다. 연계유입수를원수로사용한경우특히질소제거율은내부반송율100%, 150%, 200%에서각각74.3%, 54.5%, 83.1%로나타났으며, 모든경우에있어일반하수를원수로사용한경우보다질소제거율이우수한것으로분석되었다.

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