scholarly journals Effect of temperature and pH on biological oxidation of antifreeze coolant using a packed column aerator

2021 ◽  
Author(s):  
Syed M Nasir Naqvi
Keyword(s):  
Packed Column ◽  
Oxygen Demand ◽  
Packed Bed ◽  
Effect Of Temperature ◽  
Liquid Temperature ◽  
Initial Value ◽  
Liquid Flux ◽  
Increasing Trend ◽  
Simulated Wastewater ◽  
Bod Removal

Simulated wastewater containing 0.75% (v/v) antifreeze was treated biologically using a 0.18-m diameter packed column aerator with a 0.4-m higth packed bed of 20-mm polypropylene spheres. Effects of liquid temperature and pH on the biological oxygen demand (BOD₅) removal were investigated. All experiments were performed under an air flux of 0.0080 kg.m-².s-¹ and a liquid flux of 14.8 kg.m-².s-¹. An increasing trend of the BOD₅ removal with temperature was observed when liquid temperature was increased from 16 to 32 ºC by 4-degrees increments. When the wastewater pH was increased from 4 to 10 (by one-pH unit increments), the BOD₅ removal was increased by 18%. The averaged BOD₅ removal in the order of 90% (from the initial value of about 900 mg/L down to 80mg/L) was obtained after 96 hours of treatment. The stripping effect was accounted for about 75 mg/L of the overall BOD₅ change, i.e. about 9% of the overall BOD₅ removal. In addition, the BOD₅ removal due to the biomass in the packed column was also monitored. A decrease of about 15% in the BOD₅ removal was observed without packing in the packed column aerator.

scholarly journals Effect of temperature and pH on biological oxidation of antifreeze coolant using a packed column aerator

2021 ◽  
Author(s):  
Syed M Nasir Naqvi
Keyword(s):  
Packed Column ◽  
Oxygen Demand ◽  
Packed Bed ◽  
Effect Of Temperature ◽  
Liquid Temperature ◽  
Initial Value ◽  
Liquid Flux ◽  
Increasing Trend ◽  
Simulated Wastewater ◽  
Bod Removal

Simulated wastewater containing 0.75% (v/v) antifreeze was treated biologically using a 0.18-m diameter packed column aerator with a 0.4-m higth packed bed of 20-mm polypropylene spheres. Effects of liquid temperature and pH on the biological oxygen demand (BOD₅) removal were investigated. All experiments were performed under an air flux of 0.0080 kg.m-².s-¹ and a liquid flux of 14.8 kg.m-².s-¹. An increasing trend of the BOD₅ removal with temperature was observed when liquid temperature was increased from 16 to 32 ºC by 4-degrees increments. When the wastewater pH was increased from 4 to 10 (by one-pH unit increments), the BOD₅ removal was increased by 18%. The averaged BOD₅ removal in the order of 90% (from the initial value of about 900 mg/L down to 80mg/L) was obtained after 96 hours of treatment. The stripping effect was accounted for about 75 mg/L of the overall BOD₅ change, i.e. about 9% of the overall BOD₅ removal. In addition, the BOD₅ removal due to the biomass in the packed column was also monitored. A decrease of about 15% in the BOD₅ removal was observed without packing in the packed column aerator.

scholarly journals Biological Treatment of Wastewater Containing Automotive Antifreeze Solution Using a Packed Column

2021 ◽  
Author(s):  
M.ADNAN A. Khan
Keyword(s):  
Biological Treatment ◽  
Removal Rate ◽  
Packed Column ◽  
Oxygen Demand ◽  
Biological Degradation ◽  
Time Intervals ◽  
Flow Rates ◽  
Simulated Wastewater ◽  
Wastewater Samples ◽  
Bod Removal

Simulated wastewater samples containing antifreeze were treated biologically using a packed column as an aerator. The objective of this project is to determine the rate of biological degradation of ethylene glycol at different air flow rates, liquid flow rates, and varied seeding rates at different time intervals, to achieve the highest removal rate of the BOD. The biological oxygen demand (BOD) of the wastewater was measured. Under a liquid flowrate of 5.5 kg m̃²s̃¹ the BOD removal increased when the air flowrate was increased from 0.0069 to 0.0414 kg m̃²s̃¹. However, further increases of the air flowrate beyond 0.0138 kg m̃²s̃¹ did not affect the BOD removal rate significantly. On the other hand, with a constant air flowrate when the liquid flowrate was increased from 5.5 to 11, 16.5, and 27.5 kg m̃²s̃¹, the percent BOD removal appeared to decrease slightly. It was also found that the increase in amount of seeding has no significant effect on BOD removal. The averaged BOD removal of about 90% was obtained after 72 hours of the wastewater treatment.

scholarly journals Biological Treatment of Wastewater Containing Automotive Antifreeze Solution Using a Packed Column

2021 ◽  
Author(s):  
M.ADNAN A. Khan
Keyword(s):  
Biological Treatment ◽  
Removal Rate ◽  
Packed Column ◽  
Oxygen Demand ◽  
Biological Degradation ◽  
Time Intervals ◽  
Flow Rates ◽  
Simulated Wastewater ◽  
Wastewater Samples ◽  
Bod Removal

Simulated wastewater samples containing antifreeze were treated biologically using a packed column as an aerator. The objective of this project is to determine the rate of biological degradation of ethylene glycol at different air flow rates, liquid flow rates, and varied seeding rates at different time intervals, to achieve the highest removal rate of the BOD. The biological oxygen demand (BOD) of the wastewater was measured. Under a liquid flowrate of 5.5 kg m̃²s̃¹ the BOD removal increased when the air flowrate was increased from 0.0069 to 0.0414 kg m̃²s̃¹. However, further increases of the air flowrate beyond 0.0138 kg m̃²s̃¹ did not affect the BOD removal rate significantly. On the other hand, with a constant air flowrate when the liquid flowrate was increased from 5.5 to 11, 16.5, and 27.5 kg m̃²s̃¹, the percent BOD removal appeared to decrease slightly. It was also found that the increase in amount of seeding has no significant effect on BOD removal. The averaged BOD removal of about 90% was obtained after 72 hours of the wastewater treatment.

scholarly journals Comparison of Equilibrium-Stage and Rate-Based Models of a Packed Column for Tar Absorption Using Vegetable Oil

2020 ◽  
Vol 10 (7) ◽  
pp. 2362 ◽  
Author(s):  
Adel Almoslh ◽  
Falah Alobaid ◽  
Christian Heinze ◽  
Bernd Epple
Keyword(s):  
Experimental Data ◽  
Soybean Oil ◽  
Packed Column ◽  
Packed Bed ◽  
Effect Of Temperature ◽  
Operation Conditions ◽  
Simulation Results ◽  
Scale Experiment ◽  
Experimental Data Analysis ◽  
Process Simulator

In this study two mathematical models, rate-based and equilibrium-stage models in Aspen Plus process simulator, were used to simulate the tar absorption processes using soybean oil as a solvent in a research lab-scale experiment. The matching between simulation results and experimental data shows a good agreement. The simulation results predicted by the rate-based model show a higher level of agreement than the equilibrium model compared with the experimental data. Analysis study of tar absorption process was carried out which revealed the effect of temperature and flow rate on the soybean oil, and height-packed bed on tar removal efficiency. The methodology of selecting the optimum (most economical) operation conditions has also been performed in this study.

The Effect of Temperature on the Water Quality of Lake

2013 ◽  
Vol 821-822 ◽  
pp. 1001-1004
Author(s):  
Hong Yi Li ◽  
Jin Xu ◽  
Rui Qing Xu
Keyword(s):  
Total Nitrogen ◽  
Oxygen Demand ◽  
Ammonium Nitrogen ◽  
Effect Of Temperature ◽  
Effective Management ◽  
Nitrite Concentration ◽  
Nitrite Nitrogen ◽  
Increasing Trend ◽  
Do Concentration

Aiming at the increasing trend of pollution in Tianyin Lake watershed, more and more studied were carried out in order to alleviate lake eutrophication. COD(Chemical Oxygen Demand), TN(total nitrogen), DO (Dissolved Oxygen), NH4+-N (ammonium nitrogen), NO2--N (nitrite nitrogen) and PO43--P (phosphate) were measured for almost one month. The results showed that With the water temperature increasing, the DO concentration decreased; ammonia, nitrate,total nitrogen, COD, and phosphate increased; it had no effect on the nitrite concentration. This information was helpful in providing the basis for theoretical basis of effective management of lakes.

Savings with upgraded performance through improved activated sludge denitrification in the combined activated sludge–biofilter system of the Southpest Wastewater Treatment Plant

2008 ◽  
Vol 57 (8) ◽  
pp. 1287-1293 ◽  
Author(s):  
A. Jobbágy ◽  
G. M. Tardy ◽  
Gy. Palkó ◽  
A. Benáková ◽  
O. Krhutková ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Process Efficiency ◽  
Initial Value ◽  
Initial Profile ◽  
Biological Treatment System

The purpose of the experiments was to increase the rate of activated sludge denitrification in the combined biological treatment system of the Southpest Wastewater Treatment Plant in order to gain savings in cost and energy and improve process efficiency. Initial profile measurements revealed excess denitrification capacity of the preclarified wastewater. As a consequence, flow of nitrification filter effluent recirculated to the anoxic activated sludge basins was increased from 23,000 m3 d−1 to 42,288 m3 d−1 at an average preclarified influent flow of 64,843 m3 d−1, Both simulation studies and microbiological investigations suggested that activated sludge nitrification, achieved despite the low SRT (2–3 days), was initiated by the backseeding from the nitrification filters and facilitated by the decreased oxygen demand of the influent organics used for denitrification. With the improved activated sludge denitrification, methanol demand could be decreased to about half of the initial value. With the increased efficiency of the activated sludge pre-denitrification, plant effluent COD levels decreased from 40–70 mg l−1 to < 30–45 mg l−1 due to the decreased likelihood of methanol overdosing in the denitrification filter

Effect of temperature on streambed vertical hydraulic conductivity

2013 ◽  
Vol 45 (1) ◽  
pp. 89-98 ◽  
Author(s):  
Weihong Dong ◽  
Gengxin Ou ◽  
Xunhong Chen ◽  
Zhaowei Wang
Keyword(s):  
Hydraulic Conductivity ◽  
Water Temperature ◽  
Sediment Cores ◽  
Effect Of Temperature ◽  
In Situ Tests ◽  
Effect Of Water ◽  
Vertical Hydraulic Conductivity ◽  
Increasing Trend ◽  
Streambed Vertical Hydraulic Conductivity

In this study, in situ and on-site permeameter tests were conducted in Clear Creek, Nebraska, USA to evaluate the effect of water temperature on streambed vertical hydraulic conductivity Kv. Fifty-two sediment cores were tested. Five of them were transferred to the laboratory for a series of experiments to evaluate the effect of water temperature on Kv. Compared with in situ tests, 42 out of the 52 tests have higher Kv values for on-site tests. The distribution of water temperature at the approximately 50 cm depth of streambed along the sand bar was investigated in the field. These temperatures had values in the range 14–19 °C with an average of 16 °C and had an increasing trend along the stream flow. On average, Kv values of the streambed sediments in the laboratory tests increase by 1.8% per 1 °C increase in water temperature. The coarser sandy sediments show a greater increase extent of the Kv value per 1 °C increase in water temperature. However, there is no distinct increasing trend of Kv value for sediment containing silt and clay layers.

Effect of Temperature on Controlled Air Oxidation of Plastic and Biomass in a Packed-Bed Reactor

2013 ◽  
Vol 36 (2) ◽  
pp. 220-227 ◽  
Author(s):  
Q.-M. Meng ◽  
X.-P. Chen ◽  
Y.-M. Zhuang ◽  
C. Liang
Keyword(s):  
Packed Bed ◽  
Packed Bed Reactor ◽  
Effect Of Temperature ◽  
Air Oxidation

Effect of Process Parameters on the Adsorption of Chromium VI on a Packed Bed Column (PBC) using Vetiver (Vetiveria zizanioides)

2021 ◽  
Vol 25 (12) ◽  
pp. 53-59
Author(s):  
Pejavara Narayana Gururaj ◽  
Kulathooran Ramalakshmi ◽  
Sureshkumar Sujithra ◽  
Ravichandran Shalini
Keyword(s):  
Process Parameters ◽  
Oxygen Demand ◽  
Packed Bed ◽  
Heating Process ◽  
Tannery Effluent ◽  
Vetiveria Zizanioides ◽  
Experimental Conditions ◽  
Heated Sample ◽  
Packed Bed Column ◽  
Chromium Vi

The objective of this study is to evaluate the different process parameters on adsorption of chromium VI on a packed bed column using Vetiver (Vetiveria zizanioides) and to examine the effect of pH, Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD) at a constant contact time of 10 minutes at a temperature of 40 ºC under two experimental conditions namely, tannery effluent with and without microwave treatment. The results revealed that microwave heating process had a higher impact on chromium (VI) adsorption than normal heating process. The pH values of microwave treated sample were found to be 6.65±0.65 when compared to normal heated sample where the pH was 4.62±0.72 when compared to the initial pH of effluent found to be 3.47±0.58. Further, a threefold reduction in BOD and COD values was observed in microwave treated vetiver sample which was around 86.73±1.43 and 107.90±2.82 mg/l respectively when compared to normal heated sample (250±1.45 and 200±2.65 mg/l respectively) and untreated effluent (780±2.53 and 920±3.86 mg/l respectively) which indicated the reduction of chromium VI present in the effluent water. It was also observed that the metal adsorption capacity of the vetiver powder and the adsorption characteristics were positively correlated with the FTIR and SEM analysis which confirmed the presence of chromium (VI) on the surface of vetiver.

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