Combined oxidative and biological treatment of separated streams of tannery wastewater

2004 ◽  
Vol 49 (4) ◽  
pp. 287-292 ◽  
Author(s):  
G. Vidal ◽  
J. Nieto ◽  
H.D. Mansilla ◽  
C. Bornhardt
Keyword(s):  
Organic Matter ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
Advanced Oxidation Process ◽  
Treated Wastewater ◽  
Organic Load ◽  
Tannery Effluent ◽  
Organic Matter Removal ◽  
Significant Toxicity ◽  
High Concentrations

Leather tanning effluents are a source of severe environmental impacts. In particular, the unhairing stage, belonging to the beamhouse processes, generates an alkaline wastewater with high concentrations of organic matter, sulphides, suspended solids, and salts, which shows significant toxicity. The objective of this work was to evaluate the biodegradation of this industrial wastewater by combined oxidative and biological treatments. An advanced oxidation process (AOP) with Fenton's reagent was used as batch pretreatment. The relationships of H2O2/Fe2+ and H2O2/COD were 9 and 4, respectively, reaching an organic matter removal of about 90%. Subsequently, the oxidised beamhouse effluent was fed to an activated sludge system, at increasing organic load rates (OLR), in the range of 0.4 to 1.6 g COD/Láday. The biological organic matter removal of the pre-treated wastewater ranged between 35% and 60% for COD, and from 60% to 70% for BOD. Therefore, sequential AOP pretreatment and biological aerobic treatment increased the overall COD removal up to 96%, compared to 60% without pretreatment. Bioassays with D. magna and D. pulex showed that this kind of treatment achieves only a partial toxicity removal of the tannery effluent.

An assessment of the quality and treatment of detergent wastewater

1997 ◽  
Vol 36 (2-3) ◽  
pp. 377-381 ◽  
Author(s):  
A. Papadopoulos ◽  
C. Savvides ◽  
M. Loizidis ◽  
K. J. Haralambous ◽  
M. Loizidou
Keyword(s):  
Methylene Blue ◽  
Organic Matter ◽  
Organic Compounds ◽  
Biological Treatment ◽  
Organic Load ◽  
Total Removal ◽  
Physical Chemical ◽  
High Concentrations ◽  
Very High ◽  
Active Substances

Removal efficiency of organic load from a detergent wastewater by a bench scale physical-chemical treatment is reported. The results of the wastewater characterisation showed that the concentrations of the organic matter were very high, expressed as COD, ranging from 2400-26,400 mg/l, while the biodegradable portion was very low, since the BOD/COD ratio was low. These values indicate that organic compounds are not easily subjected to biological treatment. In addition, methylene blue active substances appeared in high concentrations as well as sulphates and ammonia. The experiments for the treatment of the wastewater were performed using various chemicals such as lime, alum and polyelectrolyte. The use of lime gave a 26% average COD removal, while by using alum a slightly lower removal was achieved, 23%. The use of lime (pH=9-10) in combination with alum led to a 41% COD reduction. Similar removal was achieved by using alum (pH=5-6) in combination with lime, 43%. Finally, the addition of polyelectrolyte in the systems of lime and alum did not improve total removal of organic matter giving reductions of 46% and 48%, respectively.

B.O.O. Case: water management project for the use of reclaimed wastewater and desalted seawater for the “Antonio Dovali Jaime” refinery, Salina Cruz, Oaxaca, Mexico

2000 ◽  
Vol 42 (5-6) ◽  
pp. 29-36
Author(s):  
C. Baron ◽  
L.O. Equihua ◽  
J.P. Mestre
Keyword(s):  
Water Management ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
Treated Wastewater ◽  
Seawater Desalination ◽  
Tertiary Treatment ◽  
Reclaimed Wastewater ◽  
Steam Generation ◽  
Management Project ◽  
Bidding Process

The water management project for the “Antonio Dovali Jaime” Refinery is definitely one of the firsts of its type that has been implemented in México. The aim of this project is to reduce the water consumption through seawater desalination for steam generation and reclamation of treated wastewater for cooling purposes. For this purpose Pemex-Refinación opened a bidding process under a Build-Own-and-Operate scheme. In 1995 the partnership formed by BICONSA, Degrémont and Marubeni was awarded this project. The processes selected include: reverse osmosis for seawater desalination as well as biological treatment with nitrification-denitrification and tertiary treatment for industrial wastewater treatment. The construction of this facility started at the end of 1997 and started its operation at the end of 1999.

scholarly journals The biological treatment of laboratory SBR model with biofilm

2018 ◽  
Vol 251 ◽  
pp. 03029 ◽  
Author(s):  
Tran Ha Quan ◽  
Elena Gogina ◽  
Tran Van Quang
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
Sequencing Batch Reactor ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Biological Wastewater Treatment ◽  
Main Task ◽  
The World

All around the world, activated sludge is the classical and traditional biological wastewater treatment for municipal and industrial wastewater. With the development of social and technology, the concentration of pollutants has been increased, so the performance of the old wastewater treatment plants not guaranteed. Therefore, upgrade and reconstruction wastewater treatment system becomes the main task of protection environment, especially in the developing countries. Application biofilms in process biological wastewater treatment is one of technology method and it has many advantages. In the Sequencing Batch Reactor, the Mutag BioChip 25TM provides to the bacteria an optimal habitat at the surface area, increasing rate of Utilization of Substrates 20 – 30% and efficiency of organic matter removal from 10 – 15%.

scholarly journals Experimental Study on a Closed-Cycle Humidification and Dehumidification System for Treating Wastewater Containing High Concentrations of Inorganic Salts and Organic Matter

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 671
Author(s):  
Jun Liu ◽  
Yong Sun ◽  
Sanjiang Yv ◽  
Jiaquan Wang ◽  
Kaixuan Hu
Keyword(s):  
Organic Matter ◽  
Industrial Wastewater ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Filter Press ◽  
Inorganic Salts ◽  
Closed Cycle ◽  
Treatment Performance ◽  
High Concentrations

Industrial wastewater contains high concentrations of inorganic salts and organic matter. This experiment studied a system for treating wastewater containing high concentrations of inorganic salts and organic matter. The setup consists of a closed-cycle humidification and dehumidification system and a filter press. Chemical wastewater was used as the treatment solution, and the treatment performance of the system was tested and analyzed. The system effectively reduced the chemical oxygen demand (COD), electric conductivity (EC), total nitrogen (TN), and ammonia nitrogen (NH4-N) in the wastewater and, at the same time, dehydrated sludge was obtained through a filter press. The system maintains a stable removal rate of each index (COD, EC, TN, and NH4-N) in wastewater and can remove inorganic salts and organic matter from wastewater. The system can successfully treat industrial wastewater containing high concentrations of inorganic salts and organic matter.

Enhanced biodegradability by oxidative and radiative wastewater treatment

1997 ◽  
Vol 35 (2-3) ◽  
pp. 245-250
Author(s):  
Christian H. Möbius ◽  
Maria Cordes-Tolle
Keyword(s):  
Organic Matter ◽  
Biological Treatment ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
High Energy ◽  
Treated Wastewater ◽  
Oxidative Destruction ◽  
Total Oxidation ◽  
High Energy Radiation ◽  
Biofilm Reactors

Processes for oxidative destruction of non-biodegradable substances in wastewater of the pulp and paper industry are using oxidants, partly in combination with catalysts or high energy radiation including UV-radiation. We summarize these processes as oxidative and radiative treatment. Instead of aiming at a total oxidation of the organic matter a partial oxidation of the persistent substances can be achieved with far less costs in biological treated wastewater. This leads to a significant improvement of the biodegradability. A subsequent biological treatment will eliminate therefore a high proportion of the remaining organic matter, which before was persistent. Special processes are needed for the additional biological treatment due to the low BOD concentration. Low loaded biofilm reactors like submerged granular biofilters have been established as the most preferred technique for this treatment. A process of this type that has been extensively studied by us is ozonation of biological treated wastewater followed by biological treatment with biofilters.

Evaluation of an Electrochemical Advanced Oxidation Process for the Organic Matter Removal from Dairy Wastewater

2019 ◽  
Vol 36 (1) ◽  
pp. 323-329
Author(s):  
Brenda Borbón ◽  
Mercedes T. Oropeza Guzmán ◽  
Shui W. Lin Ho ◽  
Gerardo Aguirre Hernandez
Keyword(s):  
Organic Matter ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Dairy Wastewater ◽  
Organic Matter Removal

Photochemical-biological treatment of a real industrial biorecalcitrant wastewater containing 5-amino-6-methyl-2-benzimidazolone

2001 ◽  
Vol 44 (5) ◽  
pp. 93-101 ◽  
Author(s):  
V. Sarria ◽  
S. Parra ◽  
M. Invernizzi ◽  
P. Péringer ◽  
C. Pulgarin
Keyword(s):  
Organic Carbon ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
Field Experiments ◽  
Advanced Oxidation Process ◽  
Flow Reactor ◽  
Pre Treatment ◽  
Total Residence Time ◽  
Compound Concentration ◽  
Fenton System

5-amino-6-methyl-2-benzimidazolone (AMBI), used in the manufacture of dyes, was characterised as a biorecalcitrant compound by means of different biodegradability tests. In order to enhance the biodegradability of this important pollutant, the application of Advanced Oxidation Process (AOPs) as a pre-treatment was explored. Some experiments were addressed to find the most efficient AOP. The systems H2O2/hv, TiO2/H2O2/hv, Fe3+/hv, Fe3+/H2O2 and Fe3+/H2O2/hv were compared. The photo-Fenton system was the most efficient and the optimal conditions (AMBI, Fe3+, H2O2 concentrations) for the degradation of AMBI were found. During the photo-Fenton degradation, experiments were also made to obtain information concerning the evolution of: (a) organic carbon and initial compound concentration; (b) the oxidation state; (c) the toxicity; (d) the biodegradability; and (e) the chemical nature of the intermediates. These analyses show that the solution resulting from the treatment of AMBI is biologically compatible and complete mineralisation can be performed by biological means. A combined photochemical (Fenton) and biological flow reactor for the degradation of AMBI was successfully operated in continuous mode at laboratory scale. 100% of the initial concentration of AMBI and 80.3% of Dissolved Organic Carbon (DOC) were removed in 3.5 hours of total residence time. Finally, some field experiments under direct sunlight carried out at the Plataforma Solar de Almeria, Spain, demonstrated that this solar catalytic system is an effective treatment for this kind of industrial wastewater.

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