총인 시설계 슬러지를 이용한 혐기성 소화 슬러지에서 재용출된 인의 제거

서정인 ( Jung-in Suh ),윤호석 ( Ho-seok Yoon ),조관훈 ( Kwan-hoon Cho ),권대원 ( Dae-won Kwon ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.3

In this study, the thickener sludge(PS-sludge) generated at total phosphorus(T-P) removal process was introduced into anaerobic digested activated sludge to examine the role of PS-sludge in immobilizing phosphorus and also in improving dewaterability of the mixed sludge. Maximum absorption capacity of phosphorus from the Langmuir isotherm plot was 9.3 mg/g-sludge(dry wt.) for PS-sludge. Experimental results observed T-P removal of 87% using a PS-sludge concentration of 1.66% TS(total solids), and the simultaneous decrease in COD(chemical oxygen demand). However the use of PS-sludge resulted in the deterioration of the dewaterability of mixed sludge by increasing the SRF(specific resistance to filtration). The results indicated that PS-sludge can further be used as absorbent media for T-P removal from the reject water, despite of the deterioration of the sludge dewaterability.

정수 슬러지를 이용한 하수처리수 방류수 중의 인 흡착에 있어 가열처리의 영향

서정인 ( Jung In Suh ),윤호석 ( Ho Seok Yoon ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.3

Heat treatment method was examined to enhance the phosphorus adsorption by alum residual produced from water purification plant. The heat treatment changes in the complex reaction between alum residual and 0H ion in solution, resulting in decrease of PH. This change was related to extraction of TOC, sulfate and chloride from alum residual. Also, the amount of TOC, sulfate and chloride from alum residual extraction dissolution was maximum at 400tm As increase the temperature from 25t (air dry) to 600t, the adsorption capacity of T-P(total phosphorus) increase from 5.15 mg T-P/g sludge to 7.12 mg T-P/g sludge. However, the maximum T-P adsorption was obtained at 400t. And, with more extraction of anions as sulfate and chloride, there is increased adsorption of T-P. It is supposed that heat treatment changes the physicochemical properties of alum residual. Futhermore, the results indicated that too higher temperature is not desirable for improving adsorption of T-P.

정수 과정에서 발생된 농축 슬러지를 이용한 반류수 중의 총인 제거

서정인 ( Jung In Suh ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.5

This study aims to investigate the effectiveness of thickener sludge generated during the drinking water treatment process for adsorption of phosphorus of supernatant (rejecter water) from 2nd anaerobic digestion tank. Experiments have demonstrated that about 82% phosphorus reduction was confirmed in the rejecter water through the adsorption of phosphorus by aluminum in the thickener sludge in mix ratio of 2:1(volume basis) for the rejecter water and thickener sludge. During the adsorption process of phosphorus, the decrease of phosphorus concentration in the rejecter water accompanied with an increase in pH and sulfate concentration suggests that phosphate replaced the functional groups from the thickener sludge which infers that ligand exchange is the dominating mechanism for phosphate removal.

정수장별 탈수 슬러지의 총인 홉착능 비교

서정인 ( Jung In Suh ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.5

This study aims to compare the maximum total phosphorus adsorption capacity (MPAC) of dewatered sludges, which were generated from four purification plants for the adsorption of T-P from effluent of municipal sewage treatment plant. The MPAC from the Langmuir isotherm plot was ranged from a low of 2.3 mg T-PIg sludge(P-3 sludge) to a high of 7.7 mg T-P/g sludge(P-4 sludge) for potassium dihydrogen phosphate solution(PDP). In the effluent of municipal sewage treatment plant, the MPAC showed a similar to MAPC for PDP. The value of MPAC lower in P-2 and P-3 sludges, which were conditioned with polyacrylamide (anionic charge) than in P-I and P.4 sludges, indicating that the polyacrylamide will affect sludge characteristics and accordingly affect the T-P adsorption capacity. Meanwhile, the P-3 sludge has the highest aluminum content, followed by P-4, P-I and P-2. The highest MPAC was obtained in P4 sludge for potassium dihydrogen phosphate solution and effluent of municipal sewage treatment plant. Although P-3 sludge was contained about I 16g aluminum/kg sludge which was higher than 40% in P-2 sludge, the MPAC was lowest. However, the MPAC highly dependent on the aluminum content in dewatered sludges except the P-3 sludge. Also, during the adsorption process of T-P, the decrease of T-P concentration in solution accompanied with an increase in pH and concentrations of anion such as sulfate and chloride. The results indicated that ligand-exchange is shown to be the dominating mechanism of T-P onto the dewatered sludges.

황산염환원균의 발효적 대사특성을 이용한 혐기성처리법에 관한 기초적연구

서정인(Jung In Suh) 한국수처리학회 1999 한국수처리학회지 Vol.7 No.2

In order to the enhancement of the efficient of anaerobic treatment process, the characteristics of fermentative metabolism by sulfidogens were investigated in anaerobic sludge that had been acclimated with glucose under sulfate loads(0 to 0.42 ㎏·SO₄^(2-)/㎥/day), while sulfate was withheld from the each anaerobic sludge that had been fed both glucose and sulfate in the steady-state. With the presence of sulfate, methanogenesis was decreased with increasing sulfate load and conversion ratio of input COD into methane was decreased by 17% at Run 6 (0.4 ㎏·SO₄^(2-)/㎥/day) compared with Run 1 (no sulfate load sludge). However, in the sulfate depletion condition, the conversion ratio of input COD into methane was about 79.3% in all condition. Also, methanogenesis from hydrogen was decreased with increasing sulfate load. However, with sulfate depletion condition, methanogenesis from hydrogen was increased, and contribution ratio of hydrogen to methane reached the maximum at Run 5 (sulfate load was converted 0.31 ㎏·SO₄^(2-)/㎥/day to 0 ㎏·SO₄^(2-)/㎥/day). Also sulfide production was stimulated by propionate, lactate, and pyruvate at sulfate depletion sludge. At the same time, the utilization rate of pyruvate and lactate by sulfidogens was maximized at Run 5. These results showed that some sulfidogen should inhabit by their fermentative metabolism using volatile fatty acids exception of acetate in the absence of sulfate. Thus, fermentative-sulfidogens converted pyruvate, propionate, lactate, etc. to acetate and hydrogen in sulfate depletion condition and then these intermediates were utilized by methanogens.

하수처리장별 총인 시설계 슬러지의 인 흡착능 비교

서정인 ( Jung In Suh ),권대원 ( Dae Won Kwon ) 한국수처리학회 2016 한국수처리학회지 Vol.24 No.4

In this study, investigation was conducted to explore the phosphorus adsorption capacity of sludge(PS-sludge) generated during the total phosphorus(T-P) removal process of municipal wastewater treatment plants in order to evaluate their application potential as phosphorus adsorbent. The major metal contents of PS-sludges are Al, Fe, Mn, Ni, Zn and Cu. In addition, the sludges contained significant amount of T-P. The maximum phosphorus adsorption capacity is 8.38 mg-P/g. The experimental results indicate that PS-sludges show a strong phosphorus adsorption capacity and it could be utilized as a new type of adsorbent for phosphorus removal.

정수 슬러지를 이용한 저수지 퇴적층에서 용출되는 인의 흡착

서정인 ( Jung In Suh ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.5

The efficiency of sediment capping with an alum sludge to prevent phosphorus release from surface sediment of reservoir under anaerobic condition was investigated through a incubation experiments, Incubation experiments proved that the T-P from the sediment into the overlying water under anaerobic condition was significantly reduced by the alum sludge, And, during the adsorption of T-P, the reduction in T-P concentration occurred with increase in concentration of T-N, TOC, sulfate and chloride. The extraction amount of T-N, TOC, sulfate and chloride from the alum sludge for 3Odays were O.009 (T-N), 0.1 0(TOC), 1 .38(sulfate) and 0.08 g/kg sludge (chloride), respectively, However, there was no significant release of aluminium during the adsorption of T-P. And T-P removal efficiency increased from 60 to 100% when alum sludge dosage was increased from 12 to 48g alum sludge/kg sediment. At dosage 48 g alum sludge/kg sediment, the uptake of T-P was 0.014 g/kg sludge. It was amount in 2% of the maximum adsorption capacity for phosphorus in alum sludge. It is suggested that the alum sludge can further be used as a capping material of T-P adsorption in reservoir.

가열 처리한 정수 슬러지를 이용한 하수 처리수 중의 인 제거

서정인 ( Jung In Suh ),윤호석 ( Ho Seok Yoon ),안정임 ( Jeong Im An ) 한국수처리학회 2012 한국수처리학회지 Vol.20 No.2

The aims of this study was to investigate the effectiveness of heated alum sludge for removal of phosphorus in effluent from sewage treatment plant. The alum sludge was taken from water purification plant which located in Daegu City. In batch adsorption tests were conducted using a effluent of sewage treatment plant (STP) and potassium dihydrogen phosphate solution(PDP). The maximum adsorption capacity for total phosphorus(T-P) from the Langmuir isotherm plot was 2.96mg T-P/g sludge for STP and 6.26mg I-PIg sludge for PDP. It implied that the competing components in the STP did affect the T-P adsorption in the heated alum sludge. Subsequently, a continuous flow tests were conducted at a 3.5nf/nf/day and a cumulative T-P loading of 6.86mg T-P/g sludge for STP. The heated alum sludge removed over 40% T-P for 70 days and it was 82% of the maximum adsorption capacity of T-P obtained in the batch adsorption tests. And during the removal of T-P process, aluminum leaching from heated alum sludge was not detected. These results indicated that heated alum sludge can further be used as a adsorbent material for removal of T-P.

소성 처리한 정수슬러지에서 회수한 응집제의 총인 처리시설에서의이용 가능성에 관한 검토

서정인 ( Jung In Suh ),윤호석 ( Ho Seok Yoon ),이택순 ( Taek Soon Lee ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.6

The objective of this study is to investigate the effects of sintering treatment on alum recovery from waterworks sludge. Results show that organic compounds are removed, while aluminum content is increased by approximately 60% when waterworks sludge is sintered for 2hr under 600℃. Sulfuric acid(3N) leaching for 24hr ratio yielded an aluminum concentration of 39,000 mg/L in the sintered sludge. The concentration of aluminum in sintered sludge was 40% higher than that in non-sintered sludge. Also concentration of aluminum in sintered sludge was 40% higher than that in non-sintered sludge at solid/liquid ratio of 100 g/L. When the coagulant recovered from sintered sludge dosed 0.15 mL/L into the influent of total phosphorus removal process, total phosphorus was below effluent quality limits (0.2 mg/L). These results have demonstrated that sintering could be suitable technologies for extraction of high concentration of aluminum from waterworks sludge by using sulfuric leaching.

정수슬러지를 이용한 댐 수몰 예정지내의 논토양으로부터 용출되는 인의 흡착

서정인 ( Jung In Suh ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.1

To evaluate the application of a water works sludge to prevent phosphorus release from paddy soil submerged by dam construction under oxic and anoxic conditions, laboratory incubation experiments using BOD bottle were conducted for 45 days. Under anoxic condition, the release rate was enhanced 2 times for phosphorus over oxic condition. However, water works sludge addition to the paddy soil led to reduced release of phosphorus in the anoxic condition. Also, during the adsorption process, decrease of total phosphorus concentration in overlying water, accompanied with an increase in pH values and concentration of sulfate, chloride and TOC by ligand exchange. Therefore, there was no excessive release of anion such as sulfate and chloride during the adsorption of phosphorus. The results indicated that water works sludge can further be used as adsorbent media for phosphorus removal in the paddy soil submerged by dam construction.