http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
슬러지 전처리(열가수분해) 반응물의 탈기공정에 따른 탈수성 영향평가
한성국,장은석,박세용,양승규,이기쁨,김호,윤수경 한국폐기물자원순환학회 2017 한국폐기물자원순환학회지 Vol.34 No.2
Recently, production of sewage and wastewater sludge have increased sharply with the population density and related industrial activity. As a result, studies of sludge treatment and reduction have been conducted and a pre-treatment method that uses thermal hydrolysis has emerged as a solution to this problem. To address problems with the thermal hydrolysis pre-treatment process, the deaeration and nitrogen recovery processes have been set up together, thus generating factors that inhibit dewaterability. In this study, the effect of pre-treatment, deaerated sludge on dewaterability-inhibiting factors (pH, temperature, aeration rate) was evaluated and alternative solutions were prepared. First, the dewaterability improvement effect increased rapidly at 190°C or higher when thermal hydrolysis pre-treatment was applied. Then, 1 L of thermal hydrolysis pre-treatment reactants at 190°C were injected into 1, 5, and 10 L/min air flows at 50°C, but no significant difference in capillary suction time (CST) or time to filter (TTF) was found. The dewaterability improved when the temperatures of the pre-treatment reactants varied between 30, 50, and 70°C under aeration at 5 L/min. However, when the pH was increased to 7, 9, or 11 at 5 L/min and 50°C, the dewaterability worsened by at least 10 times relative to the hydrolysis pre-treatment reactants. The zeta potential decreased from -30 mV to -50 mV as the pH increased. Thus, the stabilities and dispersities of the reactants increased due to the repulsive force of the particles. This was confirmed to be the cause of poor dewaterability. A coagulant can be used to solve to this problem, or the deaeration process can be placed after solid-liquid separation and the heat of thermal hydrolysis can be extracted via heat exchanger.
도계폐기물의 열가수분해 특성평가에 따른 반응온도 최적화
한성국,송형운,조병성,김호,오승용 한국폐기물자원순환학회 2013 한국폐기물자원순환학회지 Vol.30 No.3
Slaughter of cattle, pigs, and chickens is continuously increasing. Slaughter of chickens has especially increased by approximately 50% from 2003. The quantity of poultry slaughter waste is currently approximately 120,000 tons/year, and undergoes consigned treatment. Via this process, the waste must be used as a resource and an energy source. For this purpose, the waste volume can be reduced and solid fuel can be obtained from the THR (Thermal Hydrolysis Reaction) that consumes a small amount of energy. In this study, The test was conducted at a reaction temperature of 170-220oC and for 1h at the final temperature. According to the CST (Capillary Suction Time) and TTF (Time to Filter) evaluation, the dehydrating efficiency was good after the temperature reached 190oC, and did not significantly differ at the 190oC and higher reaction temperatures. The heating value of the dehydrated solid product was 7,000-7,700 kcal/kg, and its yield rate decreased from approximately 80% to 60% with the increase in the reaction temperature. The results of the BMP test also showed that the anaerobic digestion efficiency decreased at the reaction temperatures of 200oC and higher. From the overall evaluation of the dehydrating efficiency, solid fuel quality, and anaerobic digestion efficiency during the thermal hydrolysis of poultry slaughter waste, it is concluded that the optimal operating temperature is 190oC.
폭기량과 고액분리에 따른 혐기소화폐액의 액비화 특성에 관한 연구
한성국,정희숙,송형운,안대현 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.6
Recently, it is increase in the processing of organic waste using anaerobic digestion. Therefore, the studies on the processing method for increasing the anaerobic digestion waste water. Among them, purification treatment and liquid fertilizer have been issues. But, efficiency of the ways is very insufficient. While increasing the anaerobic digestion process, increasing study for the treatment of anaerobic digestion waste water. In this study, It was evaluate the characteristic of liquid fertilizer of anaerobic digestion waste water as affected by aeration rate and solid-liquid separation. Also, we review liquid fertilizer degree using maturity assessment indicators of liquid fertilizer by national institute of animal science. As a result, insertion of air (3.5 L/min) sample after solid-liquid separation appeared was the highest. pH and color was difficult to understanding correlation with liquid fertilizer among maturity assessment indicators (seed germination, ammonia (NH3), hydrogen sulfide (H2S), electrical conductivity (EC), pH, color, etc).