Metabolic activity test in investigation of biodegradation in biological filters

2001 ◽  
Vol 1 (2) ◽  
pp. 151-158
Author(s):  
E. Kijowska ◽  
M. Leszczyńska ◽  
M.M. Sozański
Keyword(s):  
Organic Carbon ◽  
Chemical Oxygen Demand ◽  
Metabolic Activity ◽  
Esterase Activity ◽  
Oxygen Demand ◽  
Chemical Oxygen Demand Removal ◽  
Activity Test ◽  
Filter Operation ◽  
Biomass Activity ◽  
Biological Filters

The esterase activity (EA) metabolic activity test was shown to be applicable to measurement of the activity of biomass of biofilters. The method was reproducible and detected significant differences in biomass activity in different filters and at various depths within each filter. The highest biomass activity occurred at the bed surface in 60% of filter media. The EA test also revealed the changes of biomass activity during the time of filter operation as a result of backwashing. For all investigated filters maximum biomass activity in the middle of washing cycle was observed. Following backwashing, the activity dropped to a minimum. The relation between TOC (total organic carbon) and COD (chemical oxygen demand) removal and biomass activity were noted. The results presented in the paper suggest that the metabolic activity test can be used in investigation of the performance of biofilters.

scholarly journals Treatment of real paracetamol wastewater by fenton process

2017 ◽  
Vol 23 (2) ◽  
pp. 177-186 ◽  
Author(s):  
Gamze Dalgic ◽  
Ilter Turkdogan ◽  
Kaan Yetilmezsoy ◽  
Emel Kocak
Keyword(s):  
Pharmaceutical Industry ◽  
Organic Carbon ◽  
Chemical Oxygen Demand ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Biological Oxygen Demand ◽  
Fenton Process ◽  
Experimental Conditions ◽  
Mass Distributions ◽  
Amino Phenol

The study investigated the pretreatment of real paracetamol (PCT) wastewater of a pharmaceutical industry by Fenton process. At the best experimental conditions (COD/H2O2 = 1/1, Fe+2/H2O2 = 1/70, settling method:centrifuging, pH 6 at settling step), 92.7, 92.7, 95.5, 99.1, 99.9 and 99.4% of chemical oxygen demand (COD), total organic carbon (TOC), 5-day biological oxygen demand (BOD5), PCT, para-amino phenol (PAP) and aniline were removed, respectively. Changes in the concentrations of these parameters were also investigated for both oxidation and settling steps of Fenton process. It was found that COD and TOC were removed at the settling step (precipitation) whereas PCT, PAP and aniline were removed at the oxidation step. Mass balance calculations were also studied to show the mass distributions of COD in different phases (gas + foam, effluent and sludge). Fenton process was found as an effective method for the pretreatment of real PCT wastewater for discharging in a determined collective treatment plant.

Chemical Oxygen Demand Removal from Wastewater by Integrated Bioreactor

2015 ◽  
Vol 8 (5) ◽  
pp. 238-243 ◽  
Author(s):  
Ezerie Henry Ezec ◽  
Shamsul Rahman Bin Mohamed Ku ◽  
Mohamed Hasnain Is ◽  
Amirhossein Malakahmad ◽  
Salihi Umar Ibrahim
Keyword(s):  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Chemical Oxygen Demand Removal ◽  
Integrated Bioreactor

scholarly journals Taguchi Method and Response Surface Methodology in the Treatment of Highly Contaminated Tannery Wastewater Using Commercial Potassium Ferrate

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3784 ◽  
Author(s):  
Violetta Kozik ◽  
Krzysztof Barbusinski ◽  
Maciej Thomas ◽  
Agnieszka Sroda ◽  
Josef Jampilek ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Organic Carbon ◽  
Taguchi Method ◽  
Chemical Oxygen Demand ◽  
Total Organic Carbon ◽  
Response Surface ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Tannery Wastewater ◽  
Potassium Ferrate

The potential implementation of Envifer®, a commercial product containing potassium ferrate (40.1% K2FeO4), for the purification of highly contaminated tannery wastewater from leather dyeing processes was proposed. The employment of the Taguchi method for optimization of experiments allowed the discoloration (98.4%), chemical oxygen demand (77.2%), total organic carbon (75.7%), and suspended solids (96.9%) values to be lowered using 1.200 g/L K2FeO4 at pH 3 within 9 min. The application of the central composite design (CCD) and the response surface methodology (RSM) with the use of 1.400 g/L K2FeO4 at pH 4.5 diminished the discoloration, the chemical oxygen demand, the total organic carbon, and suspended solids within 9 min. The Taguchi method is suitable for the initial implementation, while the RSM is superior for the extended optimization of wastewater treatment processes.

Treatment of slaughterhouse plant wastewater by using a membrane bioreactor

2011 ◽  
Vol 64 (1) ◽  
pp. 214-219 ◽  
Author(s):  
Levent Gürel ◽  
Hanife Büyükgüngör
Keyword(s):  
Organic Carbon ◽  
Chemical Oxygen Demand ◽  
Membrane Bioreactor ◽  
Nitrate Nitrogen ◽  
Oxygen Demand ◽  
Organic Substances ◽  
Slaughterhouse Wastewater ◽  
Treated Effluent ◽  
Nitrogen Concentrations ◽  
Removal Efficiencies

The use of a membrane bioreactor (MBR) for removal of organic substances and nutrients from slaughterhouse plant wastewater was investigated. The chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) concentrations of slaughterhouse wastewater were found to be approximately 571 mg O2/L, 102.5 mg/L, and 16.25 mg PO4-P/L, respectively. A submerged type membrane was used in the bioreactor. The removal efficiencies for COD, total organic carbon (TOC), TP and TN were found to be 97, 96, 65, 44% respectively. The COD value of wastewater was decreased to 16 mg/L (COD discharge standard for slaughterhouse plant wastewaters is 160 mg/L). TOC was decreased to 9 mg/L (TOC discharge standard for slaughterhouse plant wastewaters is 20 mg/L). Ammonium, and nitrate nitrogen concentrations of treated effluent were 0.100 mg NH4-N/L, and 80.521 mg NO3-N/L, respectively. Slaughterhouse wastewater was successfully treated with the MBR process.

Study on the Photochemical Decolorization of Orange II by Natural Goethite

2013 ◽  
Vol 821-822 ◽  
pp. 480-483
Author(s):  
Wei Li Zhou ◽  
Wei Ding ◽  
Jie Kuang ◽  
Long Chen ◽  
Jin Jun Li
Keyword(s):  
Reaction Mechanism ◽  
Organic Carbon ◽  
Optimum Condition ◽  
Chemical Oxygen Demand ◽  
Total Organic Carbon ◽  
Pyruvic Acid ◽  
Oxygen Demand ◽  
Orange Ii ◽  
Ph Values ◽  
Decolorization Efficiency

The decolorization of Orange II in goethite/UV system was investigated. It was discovered that the optimum condition is: pH=3, [α-FeOOH]=0.5 g/L, [Orange II]=10 mg/L. Furthermore, the absorption of Orange II on goethite, and the effect of pH values, goethite dosage and carboxylate on the decolorization were investigated. The decolorization efficiency was 90% after 6h irradiation when the concentration of pyruvic acid was 1.0mmol/L, α-FeOOH concentration was 0.3 g/L, and Orange II concentration was 10 mg/L at pH 3.0. Besides, total organic carbon (TOC) and chemical oxygen demand (COD) were determined, and a possible reaction mechanism was prompted as well.

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