EFFECT OF INFLUENT CHEMICAL OXYGEN DEMAND TO NITROGEN RATIO ON A PARTIAL NITRIFICATION/COMPLETE DENITRIFICATION PROCESS

1998 ◽  
Vol 32 (1) ◽  
pp. 165-173 ◽  
Author(s):  
CHIE-CHIEN TSENG ◽  
THOMAS G. POTTER ◽  
BEN KOOPMAN
Keyword(s):  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Partial Nitrification ◽  
Nitrogen Ratio ◽  
Denitrification Process

scholarly journals Optimisation of pH, Temperature and Carbon Nitrogen Ratio for the Degradation of m-Chlorophenol by Pseudomonas putida CP1

1970 ◽  
Vol 23 (2) ◽  
pp. 159-161 ◽  
Author(s):  
ANM Fakhruddin ◽  
M Alamgir Hossain
Keyword(s):  
Chemical Oxygen Demand ◽  
Pseudomonas Putida ◽  
C:N Ratio ◽  
Oxygen Demand ◽  
Hydroxyl Group ◽  
Ph Optimum ◽  
Effective Removal ◽  
Carbon Nitrogen Ratio ◽  
Chlorine Substituent ◽  
Nitrogen Ratio

Aromatic pollutants like m-chlorophenol is toxic to the environment and chlorophenol containing a metachlorine are more persistent under aerobic conditions than compounds lacking a chlorine substituent in positions meta to hydroxyl group. Therefore, it should be removed effectively from the environment. In order to increase the degradative activity, the optimum conditions for m-chlorophenol degradation by Pseudomonas putida CP1, some physicochemical conditions like pH, temperature and carbon nitrogen ratio for the growth and degradation of most persistent monochlorophenol, m-chlorophenol by the organism was optimised. The pH optimum for m-chlorophenol degradation by the bacterium was between pH 6.5 and 7.0 and the temperature optimum was 30°C for removal activity. Carbon : nitrogen (C:N) ratio of 3:1 was found best for effective removal of chemical oxygen demand (COD) and m-chlorophenol by the bacterium. Keywords: m-Chlorophenol degradation, Pseudomonas putida CP1, Chemical oxygen demand (COD)DOI: http://dx.doi.org/10.3329/bjm.v23i2.884  Bangladesh J Microbiol, Volume 23, Number 2, December 2006, pp 159-161

Effect of influent COD/N ratio on performance and N2O emission of partial nitrification treating high-strength nitrogen wastewater

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 61345-61353 ◽  
Author(s):  
Xinwen Zhang ◽  
Jian Zhang ◽  
Zhen Hu ◽  
Huijun Xie ◽  
Dong Wei ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Chemical Oxygen Demand ◽  
Nitrogen Removal ◽  
Oxygen Demand ◽  
High Strength ◽  
N2o Emission ◽  
Partial Nitrification

The effect of influent chemical oxygen demand/nitrogen (COD/N) ratio on nitrogen removal and nitrous oxide (N2O) emission during partial nitrification treating high-strength nitrogen wastewater was investigated.

The heterotrophic-combined-with-autotrophic denitrification process: performance and interaction mechanisms

2015 ◽  
Vol 71 (8) ◽  
pp. 1212-1218 ◽  
Author(s):  
Guihua Xu ◽  
Cuijie Feng ◽  
Fang Fang ◽  
Shaohua Chen ◽  
Yuanjian Xu ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Reduction Rate ◽  
Oxygen Demand ◽  
Process Performance ◽  
Autotrophic Denitrification ◽  
N Accumulation ◽  
Interaction Mechanisms ◽  
Molar Ratios ◽  
Denitrification Process ◽  
Heterotrophic Denitrification

In this work, the interaction mechanisms between an autotrophic denitrification (AD) and heterotrophic denitrification (HD) process in a heterotrophic-autotrophic denitrification (HAD) system were investigated, and the performance of the HAD system under different S/Ac− molar ratios was also evaluated. The results demonstrated that the heterotrophic-combined-with-autotrophic denitrification process is a promising technology which can remove chemical oxygen demand (COD), sulfide and nitrate simultaneously. The reduction rate of NO3− to NO2− by the HD process was much faster than that of reducing NO2− to N2, while the reduction rate of NO3− to NO2− by the AD process was slower than that of NO2− to N2. Therefore, the AD process could use the surplus NO2− produced by the HD process. This could alleviate the NO2−–N accumulation and increase the denitrification rate. In addition, the inhibition effects of acetate on AD bacteria and sulfide on HD were observed, and the inhibition was compensated by the promotion effects on NO2−. Therefore, the processes of AD and HD seem to react in parallel, without disturbing each other, in our HAD system.

REMOVAL OF DYE AND CHEMICAL OXYGEN DEMAND (COD) REDUCTION FROM TEXTILE INDUSTRIAL WASTEWATER USING HYBRID BIOREACTORS

2014 ◽  
Vol 13 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Ghasem Najafpour Darzi ◽  
Reza Katal ◽  
Hossein Zare ◽  
Seyed Omid Rastegar ◽  
Poorya Mavaddat
Keyword(s):  
Chemical Oxygen Demand ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Cod Reduction

Spatio-temporal Variations in Water Quality Parameter Trends in River Waters

2018 ◽  
Vol 69 (10) ◽  
pp. 2940-2952 ◽  
Author(s):  
Martina Zelenakova ◽  
Pavol Purcz ◽  
Radu Daniel Pintilii ◽  
Peter Blistan ◽  
Petr Hlustik ◽  
...  
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Quality Indicators ◽  
Water Resource Management ◽  
Oxygen Demand ◽  
Temporal Variations ◽  
Water Quality Parameter ◽  
Agricultural Activity ◽  
Water Quality Indicators ◽  
Nitrite Nitrogen

Evaluating trends in water quality indicators is a crucial issue in integrated water resource management in any country. In this study eight chemical and physical water quality indicators were analysed in seven river profiles in the River Laborec in eastern Slovakia. The analysed water quality parameters were biochemical oxygen demand (BOD5), chemical oxygen demand (CODCr), pH, temperature (t), ammonium nitrogen (NH4+-N), nitrite nitrogen (NO2--N), nitrate nitrogen (NO3--N), and total phosphorus (TP). Data from the monitored indicators were provided by the Ko�ice branch of the Slovakian Water Management Company, over a period of 15 years from 1999 to 2013. Mann�Kendall non-parametric statistical test was used for the trend analysis. Biochemical and chemical oxygen demand, ammonium and nitrite nitrogen content exhibit decreasing trends in the River Laborec. Decreasing agricultural activity in the area has had a significant impact on the trends in these parameters. However, NO2--N was the significant parameter of water quality because it mostly exceeds the limit value set in Slovak legislation, Regulation No. 269/2010 Coll. In addition, water temperature revealed an increasing trend which could be caused by global increase in air temperature. These results indicate that human activity significantly impacts the water quality.

Treatment of a complex landfill leachate with peat

1978 ◽  
Vol 5 (1) ◽  
pp. 83-97 ◽  
Author(s):  
Robert D. Cameron
Keyword(s):  
Chemical Oxygen Demand ◽  
Ferric Chloride ◽  
Landfill Leachate ◽  
Metal Removal ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Manganese Concentration ◽  
Chemical Pretreatment ◽  
Iron Manganese

The use of cheap, locally available peat as a treatment method for landfill leachate was investigated by passing leachate through plexiglass columns filled with an amorphous-granular peat. Preliminary adjustment of pH showed that reducing pH to 4.8 dramatically reduced adsorption. Increasing the pH to 8.4, metal removal was increased owing to filtration of precipitated metals. The best adsorption of metals occurred at the 'natural' pH of 7.1. Manganese was found to be the limiting pollutant. At the 0.05 mg/ℓ maximum acceptable manganese concentration 94% of the total metals were removed, requiring 159 kg of peat per 1000 ℓ of leachate.Resting the peat for 1 month did significantly increase removal capacity.Desorption of some contaminants occurred when water was percolated through the peat. The desorption test effluent was not toxic to fish although iron, lead and COD (chemical oxygen demand) exceeded acceptable values.Chemical pretreatment using lime and ferric chloride achieved significant iron, manganese and calcium removals. Chemical pretreatment followed by peat adsorption offered no advantage other than reducing toxicity to fish.Peat treatment alone was effective in reducing concentrations to a level that was non-toxic to fish.

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