Struvite 생성 공정을 이용한 도시폐기물 매립지 침출수 처리

정병곤,김광균,김병효 7개 국립대학교 환경연구 논문집 공동발행 위원회 2003 공업기술연구 Vol.3 No.-

Crystallization such as struvite or hydroxyapatite formation is one of the promising methods in removing nitrogen and phosphorus simultaneously from biologically recalcitrant wastewater. In applying these methods, Alkali is necessary in increasing pH because crystallization is occurred in high pH condition. NaOH has been traditionally used as alkali agent. However, in view of economic point, lime is cheaper than NaOH. Thus, lime was used as alkali agent instead of NaOH in this experiment and the feasibility was studied. Using leachate from landfill site of municipal solid waste as influent, the feasibility of removing nutrient salts through struvite formation and the feasibility of using seawater or bittern as magnesium source in chemical coagulation process were evaluated. When using caustic lime as alkali agent instead of NaOH, struvite was not formed because calcium ion caustic lime react with phosphorus in wastewater before struvite formation. In case of using seawater or bittern as magnesium source, ammonia nitrogen was removed 29-52%, and 36-56%, respectively. This means that the main mechanism of ammonia nitrogen removal is not by struvite formation but by ammonia stripping. Based on the results obtained in this experiment, it is recommended that optimum seawater dosage for efficient coagulation was 5% by volume ratio. It can be estimated that sodium inhibition will not be occurred at this concentration in biological wastewater treatment system.

A²/O工程을 利用한 有機物 및 營養鹽類의 同時除去에 關한 硏究

鄭炳坤 군산대학교 1991 群山水産專門大學 硏究報告 Vol.25 No.2

A laboratory investigation has been conducted to evaluate the effects of operating parameters on the removal efficiency of nitrogen, phosphorus and sludge settleability in A2/O process. The results are as follows ; 1. COD removal efficiency showed up to 95% irrespective of internal recycling rate and most of influent COD removed in anaerobic step. 2. Total nitrogen removal efficiency tended to increase as the influent organic substrate concentration increased. The efficiency at the influent concentration of 2000ng COD/L was about 99%. 3. Phosphorus removal efficiency seemed to increase as the influent organic substrate concentration increased. 4. SVI depended considerably upon the influent organic substrate concentration. SVI was marked to 58㎖/g at influent COD of 600mg/ℓ when the influent COD range of 400mg/ℓ to 2000mg/ℓ was applied.

생선폐기물 처리시스템으로 Dry Fermentation 적용 가능성 평가를 위한 생분해도 연구

정병곤,김병효 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-

To understand decomposition characteristics of waste is essential factor in defeloping optimum anaerobic digestion system for organic waste. In this study, BMP(Biochemical Methane Potential) test using serum bottle was conducted to evaluate the anaerobic degradability of fish offal. Fish offal from mackerel and hairtail and fish viscera were chosen for the substrates. Grinded fish offal was transferred anaerobically to serum bottle in amounts of 50mL,100mL,150mL, respectively. BMP test was carried out in triplicate. Cumulative methane production and methane production rate depending on incubation time were evaluated. These results varied depending on substrate characteristics. In general, however, the average value was 420-479mL/kg VS. In case of mackerel and hairtail, methane production/unit solid weight of viscera is higher than that of other part of fish offal. However, degradation rate of viscera is slower than that of other part of fish offal. Analysis of elemental composition is conducted on fish offal used in this study. Average C/N ratio of fish offal was 5.2.

PVA를 Gel Matrix로 사용한 세포고정화 방식에 의한 폐수처리

정병곤,김병효,오동필 한국대기환경학회 2007 한국대기환경학회 학술대회논문집 Vol.- No.-

내부반송이 생선폐기물 처리용 소화조의 운전효율에 미치는 영향

정병곤,김병효 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-

The effect of internal recirculation on digester performance is evaluated using reactors having 6.4cm diameter and 3cm diameter at the same surface area/reactor volume ratio. As organic loading rate of 6kg COD/㎥·d has applied to the reactors having 6.4cm diameter, COD removal efficiency of 89.6% is achieved in the reactor operated with internal recirculation, while COD removal efficiency of 20.6% is only achieved in the reactor operated without internal reciculation. It is evident that reactor performance is dependent to internal recirculation in reactor having 6.4cm diameter. In the contrary, there is no difference in COD removal effieicency depending on internal reciculation when the same experiment is conducted using reactors having 3cm diameter. that is, more than 90% of COD removal efficiency is achieved in reactor having 3cm diameter regardless of internal recirculation. The reason why the effect of internal recirculation on reactor performance is different depending on the reactor diameter can be explained that sufficient fluidization by evolving gas bubble can be achieved in the reactor having 3cm diameter, while sufficient fluidization can not be achieved only by evolving gas bubble in the reactor having 6.4cm diameter when the reactors were operated without internal recirculation. Internal recirculation can provide favorable condition for sludge bed fluidization. It can be seem that sludgy bed fluidization is key factor in start-up of upflow reactor. Internal reciculation also enhance microbial retaining capacity of upflow reactor. This can be confirmed through TSS and VSS assay too.

MAP(Magnesium-Ammonium-Phosphate) 및 응집침전을 이용한 축산폐수의 처리

정병곤,김광균,김병효 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

Crystallization method such as struvite or hydroxyapatite formation is one of the promising methods in removing nitrogen and phosphorus simultaneously from biologically recalcitrant wastewater. In these methods, Alkali is necessary in increasing pH because crystallization is occurred in high pH condition. NaOH has been traditionally used as alkali agent. However, in view of economic point, lime is cheaper than NaOH. Thus, lime was used as alkali agent instead of NaOH in this experiment and the feasibility was studied. Using swine wastewater as influent, the feasibility of removing nutrient salts through struvite formation and the feasibility of using seawater or bittern as magnesium source in chemical coagulation process were evaluated. When using caustic lime as alkali agent instead of NaOH, struvite was not formed because calcium ion caustic lime react with phosphorus in wastewater before struvite formation. In case of using seawater or bittern as magnesium source, ammonia nitrogen was removed 53~74%, and 41~78%, respectively. This means that the main mechanism of ammonia nitrogen removal is not by struvite formation but by ammonia stripping. Based on the results obtained in this experiment, it is recommended that optimum seawater dosage for efficient coagulation was 5% by volume ratio.

5‧18 민주화운동 당시 전남 경찰의 업무수행에 대한 현행법적 해석

정병곤 조선대학교 국제문화연구원 2022 국제문화연구 Vol.15 No.2

This paper classifies data on the work performance of Jeonnam police by time during the May 18 Democratic Movement and examines whether it was legal in light of the current law related to the duties of police officials at the time. To this end, based on testimony from the Jeonnam Provincial Police report produced in 2017, this research analyzes how the Jeonnam police suppressed protests before the mass firing happening on May 21, 1980, decided to evacuate weapons, and how they performed their duties in the process of unit dissolution and return after the mass firing. As a result, it can be seen whether the Jeonnam police had limitations due to martial law in performing their duties at the time of May 18, but they actually set an example for the exercise of just public power to prioritize the safety of the sovereign people in a passive way of refraining from violence such as weapon evacuation and unit dissolution.

수산물 위판장 폐기물의 처리용 소화조의 Start-up에 있어서 반응조 형상 및 슬러지층 유동화가 미치는 영향

정병곤,김병효 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-

Effect of organic loading rate on digester performance is evaluated under the conditions of same surface are/reactor volume ratio and different reactor diameter. At the low loading rate of 0.4kg COD/㎥·d, high rate of organic removal could be obtained regardless of reactor diameter. It can be estimated that reactor configuration can not affect reactor performance at the low lpading rate. However, different performance depending on reactor diameter is observed at the organic loading rate of 6kg COD/㎥·d. That is, volatile acid accumulation and low COD removal efficiency is observed in reacor having 6.4cm diameter, while volatile acid is not accumulated at all and high COD removal efficiency is observed in reactor having 3cm diameter. Such a differenfe of reactor performance depending on reactor diameter can be explained that sludge bed can be fluidized by evolved gas bubble in narrow reactor, while sludge bed can not be fluidized by evolved gas bubble only in wide reactor. At a high organic loading rate of 20kg COD/㎥·d, It can be judged that there is no relation between reactor configuration and reactor performance because all reactors showed very low COD removal efficiencies regardless of reactor diameter. Sludge bed fluidization is one of the most imjprotant factors in achieving efficient start-up of anaerobic digester. Narrow and tall type reactor is favorable condition for making sludge bed fluidization at a constant surface area/reactor volume ratio.Thus, it can be judged that reactor configuration and sludge bed fluidization have great influence to reactor performance.

고밀도 해산어 양식장 순환수로부터 유기물 및 암모니아질소 동시 제거

정병곤,김문태,이헌모 대한환경위생공학회 2003 대한환경위생공학회지 Vol.18 No.1

양계업 미래를 조망하다 - 동물약품업계

정병곤,Jeong, Byeong-Gon 대한양계협회 2019 월간 양계 Vol.51 No.11