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Toor Umair Ali,Zubair Ahmed,김동진 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Empirical N2O emission correlations were developed from wastewater nitrification in a controlled laboratory scale batch reactor. The results showed that higher concentrations of ammonium and nitrite emitted more N2O. The N2O-N yields were 0.092–0.124 (synthetic wastewater) and 0.124–0.152 kg N2ON/kg consumed NH4+-N (municipal wastewater). Regression analysis showed that N2O emission had positive linear correlation with logarithm of NH4+-N concentration and exponential of NO2 -N concentration. The results indicate that nitrite is the most influential component on N2O emission in wastewater nitrification. The models can be used to estimate and to mitigate N2O emission from wastewater treatment plant.
Umair Ali Toor,신현아,김동진 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
Efficiency of phosphorus recovery from polyaluminum chloride sludge is determined by chemicalinteractions between Al and P. Chemical structure of Al–P complex and their binding mechanisms in thePAC sludge were investigated with spectroscopy and chemical fractionation. More than 98% of the P wasbound with Al, out of which 70% was strongly bound. The ATR-FTIR analysis indicates that the majority ofthe P formed inner sphere complex with Al through ligand exchange. The availability of highly protonatedsurface for P sorption at low pH also supports the formation of Al–P outer sphere complex.
( Ali Toor Umair ),( Min Wook Kim ),( Dong Jin Kim ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.5
Nitrification in wastewater treatment emits a significant amount of nitrous oxide (N2O), which is one of the major greenhouse gases. However, the actual mechanism or metabolic pathway is still largely unknown. Selective nitrification inhibitors were used to determine the nitrification steps responsible for N2O emission with activated sludge and enriched nitrifiers. Allylthiourea (86 μM) completely inhibited ammonia oxidation and N2O emission both in activated sludge and enriched nitrifiers. Sodium azide (24 μM) selectively inhibited nitrite oxidation and it led to more N2O emission than the control experiment both in activated sludge and enriched nitrifiers. The inhibition tests showed that N2O emission was mainly related to the activity of ammonia oxidizers in aerobic condition, and the inhibition of ammonia monooxygenase completely blocked N2O emission. On the other hand, N2O emission increased significantly as the nitrogen flux from nitrite to nitrate was blocked by the selective inhibition of nitrite oxidation.
Toor, Umair Ali,Shin, Hyuna,Kim, Dong-Jin Elsevier 2019 Journal of industrial and engineering chemistry Vol.71 No.-
<P><B>Abstract</B></P> <P>Efficiency of phosphorus recovery from polyaluminum chloride sludge is determined by chemical interactions between Al and P. Chemical structure of Al–P complex and their binding mechanisms in the PAC sludge were investigated with spectroscopy and chemical fractionation. More than 98% of the P was bound with Al, out of which 70% was strongly bound. The ATR-FTIR analysis indicates that the majority of the P formed inner sphere complex with Al through ligand exchange. The availability of highly protonated surface for P sorption at low pH also supports the formation of Al–P outer sphere complex.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PAC sludge contained AlPO<SUB>4</SUB> or related Al–phosphate complex. </LI> <LI> Results showed that 2 types of Al–P bonds are formed in PAC sludge. </LI> <LI> 70% of total Al–P, strongly bound, while 29% was moderate to strongly bound. </LI> <LI> Al–P complex are formed majorly by ISC through ligand exchange mechanism. </LI> <LI> Bidentate binuclear complex followed by monodentate mononuclear and bidentate mononuclear formed at acidic and alkaline pH respectively. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
N<sub>2</sub>O emission during wastewater nitrification with enriched nitrifying bacteria
Toor, Umair Ali,Han, Dong-Woo,Kim, Dong-Jin Informa UK (Taylor Francis) 2016 Desalination and water treatment Vol.57 No.2
<P>Nitrifying bacteria were enriched in a sequencing batch reactor and used to quantify N2O emission specifically by wastewater nitrification while minimizing or preventing the chances of denitrification during the experiment. Batch wastewater nitrification was carried out in a reactor (working volume 0.5L) at different aeration rates (10 and 20mL/min) and -N concentrations (25, 50, and 100mg/L). Wastewater nitrification efficiencies were more than 97% in all the cases except at 100mg/L with 10mL/min aeration rate (92%). Cumulative N2O emission reached 0.2, 1.15, and 2.67mg (aeration: 10mL/min) and 0.37, 2.18, and 3.08mg (aeration: 20mL/min) at the initial -N concentration of 25, 50, and 100mg/L, respectively. N2O emission yields (kg N2O-N per kg processed -N) were 0.016-0.058 and 0.029-0.088 at 10 and 20mL/min aeration rate, respectively. The yields were higher than that of denitrification. The results showed that cumulative N2O emission and the yield increased at higher ammonium concentration and aeration rate. Accumulated nitrite during nitrification also contributed and played a pivotal role in N2O emission.</P>
Fida Hussain,엄헌섭,Umair Ali Toor,이창수,Sang-Eun Oh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Toxicity assessment using microalgae adopted various endpoint measurements like mortality rate, photosynthetic activity, chlorophyll content, enzymatic activity, cell density, 14C assimilation, and phosphate uptake. These algal toxicity tests usually require 3–4 days of exposure time and laborious work to measure these endpoints parameters. In the present study, we described a simple and rapid toxicity assessment procedure using photosynthetic oxygen evolution as an endpoint measurement to determine heavy metal-induced toxicity. Oxygen evolution in gaseous phase was measured over a 12 h exposure time. The toxicity of six selected heavy metals was assessed. Concentrations of 1.02, 1.91, 0.46, 3.2, 7.5, and 65.6 mg/L were obtained as EC50 values for mercury, silver, cyanide, copper, cadmium, and hexavalent chromium, respectively, for microalgae (Chlorella vulgaris). Our results demonstrated that hexavalent chromium is less sensitive depending on the conditions (low exposure time, pH 6, and high initial biomass). Toxicities in decreasing order of strength were cyanide > mercury > silver > copper > cadmium > hexavalent chromium. Results obtained in the current and earlier studies demonstrate that photosynthetic oxygen evolution offers an alternative endpoint measurement to assess toxicity since it allows sensitive and rapid detection of heavy metal-induced toxicity in water.
Fida Hussain,Heonseop Eom,Umair Ali Toor,Chang Soo Lee,Sang-Eun Oh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
Toxicity assessment using microalgae adopted various endpoint measurements like mortality rate, photosynthetic activity, chlorophyll content, enzymatic activity, cell density, <SUP>14</SUP>C assimilation, and phosphate uptake. These algal toxicity tests usually require 3-4 days of exposure time and laborious work to measure these endpoints parameters. In the present study, we described a simple and rapid toxicity assessment procedure using photosynthetic oxygen evolution as an endpoint measurement to determine heavy metal-induced toxicity. Oxygen evolution in gaseous phase was measured over a 12 h exposure time. The toxicity of six selected heavy metals was assessed. Concentrations of 1.02, 1.91, 0.46, 3.2, 7.5, and 65.6 mg/L were obtained as EC50 values for mercury, silver, cyanide, copper, cadmium, and hexavalent chromium, respectively, for microalgae (Chlorella vulgaris). Our results demonstrated that hexavalent chromium is less sensitive depending on the conditions (low exposure time, pH 6, and high initial biomass). Toxicities in decreasing order of strength were cyanide > mercury > silver > copper > cadmium > hexavalent chromium. Results obtained in the current and earlier studies demonstrate that photosynthetic oxygen evolution offers an alternative endpoint measurement to assess toxicity since it allows sensitive and rapid detection of heavy metal-induced toxicity in water.
국내 말, 사슴, 염소 분뇨 유래 양분 발생량 및 농경지 부하량 산정
심수민 ( Soomin Shim ),김기원 ( Kiwon Kim ),( Umair Ali Toor ),김승수 ( Seungsoo Kim ),곽정훈 ( Junghoon Kwag ),정배동 ( Baedong Jung ),원승건 ( Seunggun Won ),라창식 ( Changsix Ra ) 한국축산학회 2021 동물자원연구 Vol.32 No.4
The nutrient balances originated from livestock manure in Korea has not being include minor livestock species (e.g., horse, deer, and goat) since their manure excretion unit (MEU), nutrient excretion unit (NEU), and nutrient loading coefficient (NLC) are not known yet. In the present research work, the primary focus had laid therefore on securing domestic MEU for the specified minor livestock species which provides the basis for the computation of NEU and NLC. Moreover, the nutrient potential and economic value of composted manure from minor livestock was assessed on the basis of contents in the inorganic fertilizers such as Urea, (46% N) and Fused superphosphate (20% phosphorus pentoxide). The obtained MEU was found to be 10.52±5.48, 4.07±1.69, and 0.843±0.1 kg/head/day for horse, deer, and goat, respectively. In addition, the measured NLCs of horse, deer, and goat were [N, 0.7; P, 0.9], [N, 0.7; P, 0.6] (Both deer and goat were the same.), respectively. Consequently, the horse, deer, and goat manure have a potential of 3,840.1 ton N/year and 9,390.2 ton P/year as an inorganic fertilizer of urea and fused superphosphate. These findings may facilitate the development of more accurate nutrient budget taking into account both major and minor livestock and improve the manure management measures for land application.