Adsorption of chemical oxygen demand from textile industrial wastewater through locally prepared bentonite adsorbent

2021 ◽  
Author(s):  
A. Tebeje ◽  
Z. Worku ◽  
T. T. I. Nkambule ◽  
J. Fito
Keyword(s):  
Chemical Oxygen Demand ◽  
Industrial Wastewater ◽  
Oxygen Demand

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

DETERMINATION OF CHEMICAL OXYGEN DEMAND IN URBAN AND INDUSTRIAL WASTEWATER USING MICROWAVE SAMPLE DIGESTION

2002 ◽  
Vol 33 (15-18) ◽  
pp. 3443-3447 ◽  
Author(s):  
Ignacio Gómez ◽  
Roberto Ivorra ◽  
Ana Pérez ◽  
Ana María Santacruz ◽  
Juan Navarro ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Sample Digestion

scholarly journals Removal of Color and Chemical Oxygen Demand Using a Coupled Coagulation-Electrocoagulation-Ozone Treatment of Industrial Wastewater that Contains Offset Printing Dyes

2017 ◽  
Vol 58 (3) ◽  
Author(s):  
Gabriela Roa-Morales ◽  
Carlos Barrera-Díaz ◽  
Patricia Balderas-Hernández ◽  
Francisco Zaldumbide-Ortiz ◽  
Horacio Reyes Perez ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Color Removal ◽  
Sequential Treatment ◽  
Ozone Treatment ◽  
Optimal Conditions ◽  
Offset Printing ◽  
Printing Processes

Industrial offset printing processes generate wastewater with highly colored obtaining values of 5x10<sup>6</sup> Pt-Co units and great values of chemical oxygen demand (COD) 5.3x10<sup>-5</sup> mg L<sup>-1</sup>. Thus, conventional technologies such as biologicals treatment fail in reaching the discharge limits. In this research, a sequential treatment was applied: coagulation with aluminum hydroxychloride (AHC), electrocoagulation with Al anodes and finally ozonation. Optimal conditions are found when adding 20 mg L<sup>-1</sup> AHC, followed by electrocoagulation at 4 A for 50 min, and finally alkaline ozonation for 15 min, resulting in an overall color removal of 99.99% color and 99.35% COD.

scholarly journals The effect of hydrothermal treatment on industrial wastewater: Hungary as a case study

2020 ◽  
Author(s):  
Mahmood Al Ramahi ◽  
Sándor Beszédes ◽  
Gábor Keszthelyi-Szabó
Keyword(s):  
Chemical Oxygen Demand ◽  
Hydrothermal Treatment ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Sodium Absorption ◽  
Treatment Technique ◽  
Sodium Absorption Ratio ◽  
High Concentrations ◽  
Wastewater Samples

AbstractIndustrial wastewater is a growing environmental challenge due to its high concentrations of organics and its limited biological degradability. Up to date, however, no published work discussed industrial wastewater characterization, which is the focus of this study. Moreover, the effect of hydrothermal treatment on the chemical oxygen demand (COD) removal and the soluble chemical oxygen demand (SCOD) release was investigated in this work. Wastewater samples were collected from different industrial sites and characterized in order to determine their initial properties. It was summarized that the salinity of wastewater estimated by EC was relatively low, and its pH values were in the acceptable range. On the other hand, however, high values of sodium absorption ratio (SAR) were obtained in all samples post to hydrothermal treatment. Nonetheless, our results revealed higher SCOD release post to hydrothermal treatment suggesting better efficiency of COD removal obtained by this treatment technique.

scholarly journals APPLICATION OF RESPONSE SURFACE METHODOLOGY (RSM) - REDUCTION OF INDUSTRIAL WASTEWATER CHEMICAL OXYGEN DEMAND

2017 ◽  
Vol 5 ◽  
pp. 1226-1232 ◽  
Author(s):  
Emmanuel Kweinor Tetteh ◽  
Sudesh Rathilal
Keyword(s):  
Response Surface Methodology ◽  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Response Surface ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Chemical Oxygen Demand Removal ◽  
Oil Refineries ◽  
Study Results ◽  
Input Variables

Industrial waste oil in water from oil refineries and petrochemical processing poses a major environmental concern. Environmental pollution from these wastewaters is increasing and will continue to rise due to a growing demand for petrochemical products and energy. The composition of these industrial wastes varies from location to location as well as with manufacturing processes. In terms of water quality issues, chemical oxygen demand is considered one of the most problematic in oil refinery wastewater treatment. This study applies the response surface methodology to obtain a response model for industrial wastewater treatment. Operating parameters are optimized to enhance the treatment performance. The study, focusing on the effects of input variables for chemical oxygen demand removal, was experimentally carried out using dissolved air floatation jar tests. The experimental matrix incorporated the Box-Behnken design in the response surface methodology. In addition, the procedure evaluated the effect of the input variables and their interactions to obtain the optimum condition for the extent of efficiency. The results show that the chemical oxygen demand removal was sensitive to the effect of the input variables and their interactions. The statistical analysis established that the quadratic model was highly significant with a low probability (< 0.0001), indicating that the correlated regression scattering was unlikely random. The predicted model results corresponded well to the experimental results, with a coefficient of determination close to 1.0. The response surface of the model is presented in three-dimensional plots. These study results show that the addition of a coagulant to remove chemical oxygen demand is effective under acidic conditions when response surface methodology is applied.

scholarly journals Chemical Oxygen Demand reduction in industrial wastewater using locally isolated bacteria

2014 ◽  
Vol 6 (2) ◽  
Author(s):  
Nor Syamimi Musa ◽  
Wan Azlina Ahmad
Keyword(s):  
Chemical Oxygen Demand ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
Bacterial Culture ◽  
Oxygen Demand ◽  
Good Alternative ◽  
Cod Reduction ◽  
Demand Reduction ◽  
Conventional Methods ◽  
Industry Wastewater

Wastewater that has been discharged from the pineapple industry contributes to high levels of Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Suspended Solids (SS). The high levels of COD concentrations in wastewater are toxic to biological life and will affect aquatic environment. Currently, there are many methods that have been developed to treat pineapple industry wastewater such as ozonation, reverse osmosis and filtration. However, these conventional methods are costly and generate large amounts of sludge. Biological treatment may be a good alternative since its operational cost is less and it creates an environmental friendly atmosphere compared to the conventional methods. In this study, the effectiveness of COD reduction involving a single bacterial culture D, G and I isolated from a pineapple industry wastewater were used in batch system. The COD reduction of pineapple industry wastewater was carried out using bacterial culture and pellet. The performance of these systems in reducing the COD level was monitored within 3 days. The COD reduction was analyzed using a Hach DR/4000 U spectrophotometer. The bacterial pellet D, G and I showed a maximal COD reduction of 87%, 77% and 94% respectively after 3 days exposure to wastewater. The wastewater treatment using bacterial pellet showed higher COD reduction as compared to treatment using whole bacterial culture. FESEM analysis showed that bacteria D, G and I appeared as rod shaped.

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