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하정협,최석순 한국공업화학회 2021 공업화학 Vol.32 No.5
In this study, soil slurry bioreactors were used to treat soils containing 16 polycyclic aromatic hydrocarbons (PAHs) for 35 days. Five different soil samples were taken from manufactured gas plant (MGP) and coal tar disposal sites. Soil properties, such as carbon content and particle distribution, were measured. These properties were significantly correlated with percent biodegradation and degradation rate. The cumulative amount of PAH degraded (P), degradation rate (Km), and lag phase (λ) constants of PAHs in different MGP soils for 16 PAHs were successfully obtained from nonlinear regression analysis using the Gompertz equation, but only those of naphthalene, anthracene, acenaphthene, fluoranthene, chrysene, benzo[k]fluoranthene, benzo(a)pyrene, and benzo(g,h,i)perylene are presented in this study. A comparison between total non-carcinogenic and carcinogenic PAHs indicated higher maximum amounts of PAH degraded in the former than that in the latter owing to lower partition coefficients and higher water solubilities (S). The degradation rates of total non-carcinogenic compounds for all soils were more than four times higher than those of total carcinogenic compounds. Carcinogenic PAHs have the highest partitioning coefficients (Koc), resulting in lower bioavailability as the molecular weight (MW) increases. Good linear relationships of Km, λ, and P with the octanol-water partitioning coefficient (Kow), MW, and S were used to estimate PAH remaining, lag time, and biodegradation rate for other PAHs.
다양한 전처리에 따른 중온협기-고온호기 복합슬러지 처리공정의 슬러지 처리효율 및 메탄 생성량 변화
하정협,박종문,박상규,조현욱,장현민,최석순 유기성자원학회 2013 유기물자원화 Vol.21 No.3
In this study, various influent sludge pre-treatment methods were adopted to investigate their effects on the sludge digestion and methane production in combined mesophilic anaerobic and thermophilic aerobic sludge digestion process. A lab-scale sewage sludge digestion process was operated during 4 phases using different feed sludge pre-treatment strategies. In phase 1, feed sludge was supplied without any pre-treatment. In contrast, in phases 2, 3 and 4, thermal, thermal-alkaline and long time alkaline treatment (7 days) were applied to influent sludge, respectively. With sludge pre-treatment, TCOD removal was drastically increased from 44% to 76% from phases 1 to 4, respectively. Also, pre-treatment of feed sludge significantly improved the methane production rate of MAD, showing an increment from 101 to 165-256mL/L/day. Meanwhile, TCOD removal and methane production at phase 4 were not increased, compared to those at phase 3. Based on the experimental results, it was concluded that pre-treatment of feed sludge significantly increases the efficiency of sludge digestion and thermal-alkaline method was the most effective method among the pre-treatment methods examined. 본 연구에서는 유입 슬러지에 다양한 전처리 방법을 적용하여 전처리 방법이 중온혐기-고온호기 복합 슬러지 처리 공정의 슬러지 소화효율과 메탄가스 생성량에 미치는 영향을 비교 검증하였다. 실험실 규모의 슬러지 소화장치를 제작하여 서로 다른 유입 슬러지 전처리방법을 적용하여 4단계로 실험을 진행하였다. 1단계에서는 전처리를 하지 않은 슬러지를 공급하였고, 2, 3, 4단계에서는 각각 열처리, 열-알칼리처리, 장기 알칼리 처리(7일)를 거친 유입 슬러지를 공급하였다. 실험 결과, 1단계에서 4단계까지 진행되는 동안 총COD 제거율은 44%에서 76%까지 증가하였으며, 메탄 생성량 또한 101mL/L/day에서 165, 256mL/L/day까지 크게 증가하였다. 한편, 4단계에서는 7일간의 장기 알칼리 처리를 하였음에도 불구하고 3단계에 비해 총COD 제거율과 메탄 생성량이 증가하지 않았다. 결론적으로, 유입 슬러지의 전처리를 통해 복합 슬러지 처리 공정의 슬러지 제거 효율과 메탄생성량을 크게 증가시킬 수 있었으며, 여러 가지 전처리 방법 중 열-알칼리 처리법이 가장 효율적임을 실험결과를 통해 알 수 있었다.
하정협 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In this study, a lab-scale co-digestion process was operated to observe the parameter changes according to the increase of organic loading rate using different dilution ratios of distilled water and food wastewater (1/3 [Run I], 2/3 [Run II], raw food wastewater [Run III]). The results indicated that co-digestion process maintained quite stable and constant pH during entire experiments. With regard to VS removal, higher removal was observed in the combined process and the removal efficiency was 52.24% (Run I), 66.59% (Run II) and 72.53 (Run III), respectively. In addition, combined process has about 1.6-fold higher methane production rate and significantly higher methane yield than that of single anaerobic digestion process.
Phosphate Removal by Zirconium Fumarate (Zr-fum) Metal-organic Framework (MOF)
하정협,( Phani Brahma Somayajulu Rallapalli ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In the present study, Zirconium Fumarate (Zr-fum) metal-organic framework (MOF), solvothermally synthesized at 130 °C and characterized by using powder X-ray diffraction analysis (PXRD), porosity measurements using N2 sorption isotherms at 77 K and FTIR spectroscopy. The phosphate removal efficiency (% removal) obtained by 0.05 g/L adsorbent dose at an initial phosphate concentration 60 ppm in 3 hours was 72.47% whereas 100 and 89.88 % of phosphate removal efficiency was obtained at an initial phosphate concentrations of 5 and 20 ppm, respectively within 30 min for the same adsorbent dose. The BET surface area and pore volume of the bare Zr-fum sample was 478.25 ㎡/g and 0.52 ㎤/g, respectively whereas after phosphate adsorption (at an initial concentration 60 ppm, 3 hours) the BET surface area and pore volume were reduced to 331.66 m2/g and 0.39 cm3/g, respectively.
Bioenergy production using anaerobic digestion
하정협 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
In this study, organic matter removal, methane production and microbial changes in a thermophilic anaerobic process were compared with those in a mesophilic anaerobic reactor. Microbial community structures were examined by quantitative real-time PCR (qPCR) and highthroughput pyrosequencing at five different FWW mixing ratios since there are no previous reports comparing the bacteria community in thermophilic AcoD (TAcoD) and mesophilic AcoD (MAcoD) of WAS and FWW. As the load of FWW was increased, methane production rate (MPR; L CH4/L d) and methane content (%) in both TAcoD and Mesophilic AcoD (MAcoD) increased significantly. Further qPCR and highthroughput pyrosequencing investigations demonstrated remarkable differences in microbial species between TAcoD and MAcoD and major phylotype shifts depending on changes in the FWW load. Taken together, this study demonstrated the dynamics of key microbial populations, which were highly consistent with reactor performance.