scholarly journals AVALIAÇÃO DA EFICIÊNCIA DE AGENTES COAGULANTES EM EFLUENTE DE FRIGORÍFICO

2020 ◽  
Vol 12 (1) ◽  
pp. 11-19
Author(s):  
Alexandre Teixeira Souza ◽  
Danielli Chagas
Keyword(s):  
Comparative Study ◽  
Removal Efficiency ◽  
Small Variation ◽  
Cod Removal ◽  
The Other ◽  
Anionic Polymer ◽  
Turbidity Removal ◽  
Natural Coagulant ◽  
Aluminum Sulphate ◽  
Vegetable Tannin

In the refrigeration industry, a large amount of water is used throughout processes, generating effluents that need treatment before release. The purpose of this work was to make a comparative study of three coagulants used in the treatment of effluents: Aluminum Polychloride (PAC), Aluminum Sulphate (Al2(SO4)3) and Vegetable Tannin, with the aid of a flocculant (Anionic Polymer) by analyzing COD removal efficiency and turbidity. Jar coagulation / flocculation tests were conducted to optimize the concentration of coagulants. It was found that the natural coagulant presented a small variation in the pH parameter, avoiding the use of chemicals for its correction. The results of turbidity removal percentages indicated a great potential for Tannin when compared to the other chemical coagulants.

scholarly journals Study of the Effect of Activated Carbon Cathode Configuration on the Performance of a Membrane-Less Microbial Fuel Cell

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 619
Author(s):  
M. L. Jiménez González ◽  
Carlos Hernández Benítez ◽  
Zabdiel Abisai Juarez ◽  
Evelyn Zamudio Pérez ◽  
Víctor Ángel Ramírez Coutiño ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Removal Efficiency ◽  
Internal Resistance ◽  
Cod Removal ◽  
The Other ◽  
Cod Removal Efficiency ◽  
Water Recirculation ◽  
Better Than

In this paper, the effect of cathode configuration on the performance of a membrane-less microbial fuel cell (MFC) was evaluated using three different arrangements: an activated carbon bed exposed to air (MFCE), a wetland immersed in an activated carbon bed (MFCW) and a cathode connected to an aeration tower featuring a water recirculation device (MFCT). To evaluate the MFC performance, the efficiency of the organic matter removal, the generated voltage, the power density and the internal resistance of the systems were properly assessed. The experimental results showed that while the COD removal efficiency was in all cases over 60% (after 40 days), the MFCT arrangement showed the best performance since the average removal value was 82%, compared to close to 70% for MFCE and MFCW. Statistical analysis of the COD removal efficiency confirmed that the performance of MCFT is substantially better than that of MFCE and MFCW. In regard to the other parameters surveyed, no significant influence of the different cathode arrangements explored could be found.

scholarly journals Treatment of Al Doura Oil Refinery Wastewater Turbidity using Magnetic Flocculation

2019 ◽  
pp. 1-8
Author(s):  
Muzher Al doury ◽  
Hadeel Al samerrai
Keyword(s):  
Removal Efficiency ◽  
Suspended Solids ◽  
Suspended Solid ◽  
Operating Conditions ◽  
Oil Refinery ◽  
Refinery Wastewater ◽  
Turbidity Removal ◽  
Aluminum Sulphate ◽  
Solids Removal ◽  
Oil Refinery Wastewater

The use of conventional flocculants such as Aluminum sulphate (Alum) alone to treat the wastewater may be insufficient to get the required turbidity, suspended solids removal as well as it requires relatively a long residence time. Magnetic flocculation is one of the used techniques for increase the efficiency of the turbidity removal. In the present study, three sets of experiments are carried out in order to investigate the possibility of increasing the suspended solid removal efficiency from Al Doura oil refinery wastewater using iron oxide (Fe3O4), Nickel (Ni), and Cobalt (Co) ferromagnetic powders with alum. The following operating conditions namely, pH, alum dose, ferromagnetic powder dose, and initial turbidity are studied. The results revealed that an improvement in turbidity removal efficiency is satisfied, as well as, a reasonable reduction in the sedimentation period is achieved. The highest turbidity removal is 99.88% that obtained for 122NTU sample for alum dose 120 mg/L+ Nickel dose of 80mg/L and pH of 6.5.

Treatment of synthetic kraft evaporator condensate using thermophilic and mesophilic membrane aerated biofilm reactors

2010 ◽  
Vol 61 (7) ◽  
pp. 1749-1756 ◽  
Author(s):  
B. Q. Liao ◽  
M. R. Zheng ◽  
L. Ratana-Rueangsri
Keyword(s):  
Comparative Study ◽  
Chemical Oxygen Demand ◽  
Removal Efficiency ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Biofilm Reactors ◽  
Cod Removal Efficiency

A comparative study on the treatment of synthetic kraft evaporator condensate was conducted using thermophilic (55°C) and mesophilic (30°C) membrane aerated biofilm reactors (MABRs) and sequencing batch reactors (SBRs) for 8 months. Under tested conditions, a chemical oxygen demand (COD) removal efficiency of 80–95% was achieved with both thermophilic and mesophilic MABRs and SBRs. The COD removal efficiency of thermophilic MABR (80–90%) was slightly lower than that of the mesophilic MABR (85–95%) and the thermophilic SBR (90–95%). A significant amount (13–37%) of COD was stripped by conventional aeration in the SBRs, while stripping in MABRs was negligible. Simultaneous COD removal and denitrification were observed in the mesophilic MABR, while the thermophilic MABR contributed mainly for COD removal. Nitrification was not significant in both the thermophilic and mesophilic MABRs. The results suggest that treatment of kraft evaporator condensate is feasible with the use of both thermophilic and mesophilic MABRs in terms of COD removal with the advantages of negligible stripping.

Case study on the bioeffluent of petrochemical wastewater by electro-fenton method

1999 ◽  
Vol 39 (10-11) ◽  
pp. 145-149 ◽  
Author(s):  
Yao-Hui Huang ◽  
Shanshan Chou ◽  
Ming-Ging Perng ◽  
Gaw-Hao Huang ◽  
Sheng-Shung Cheng
Keyword(s):  
Removal Efficiency ◽  
Sodium Hypochlorite ◽  
Operating Conditions ◽  
Cod Removal ◽  
The Other ◽  
Ferrous Ion ◽  
Screening Tests ◽  
Fenton Process ◽  
Petrochemical Wastewater

The electro-Fenton method, in which ferrous ion is produced at the anode and used as a catalyst of H2O2, was applied for treating the bioeffluent of petrochemical manufacturing wastewater. The major pollutant in the bioeffluent was identified as hexamine, which was nonbiodegradable and contributed 65% of COD. The goal of this study was to treat the biotreatment effluent with more than 50% of COD removal efficiency. Oxidants that involved ozone, ozone/H2O2, sodium hypochlorite, and Fenton's reagent were employed to treat this effluent by jar tests. However, none could meet the goal in the range of operating conditions used. On the other hand, more than 80% of COD was removed with the electro-Fenton process. These screening tests indicated that only the electro-Fenton process was compatible with the goal.

scholarly journals Use of thermal water as a natural coagulant for domestic wastewater sustainable treatment

2017 ◽  
Vol 26 (44) ◽  
pp. 33 ◽  
Author(s):  
Javier Andrés Quintero-Jaramillo ◽  
Walter Murillo-Arango ◽  
Ivonne Ximena Cerón-Salazar
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Thermal Water ◽  
Domestic Wastewater ◽  
World Population ◽  
Coagulation Activity ◽  
Promising Alternative ◽  
Natural Coagulant ◽  
Domestic Wastewater Treatment ◽  
Aluminum Sulphate

In the last several years, the interest on domestic wastewater treatment has increased due to the rise of water consumption resulted from the world population growth. The excessive use of inorganic coagulants, such as aluminum sulphate, in domestic wastewater treatment processes contributes to generate high negative environmental impacts and risks to living organisms. Besides its low biodegradability, as aluminum sulphate increases metal content in discharged effluents rises, generating toxic sludge. Therefore, searching for clean and sustainable processes for domestic wastewater treatment is important in order to reduce the pollutant discharges into fresh water bodies. In this paper, the potential use of thermal water as a natural coagulant for the domestic wastewater treatment from Manizales city (department of Caldas, Colombia), was studied. The effect of coagulant dose was analyzed and compared with the results of the conventional coagulants. Applying different doses of coagulants in domestic wastewater showed that the best coagulation activity was achieved by adding 35 ml/l of thermal water, and 140 mg/l of aluminum sulphate. In both cases, high turbidity removal efficiency (98.1 %) was achieved. The removal efficiency of Chemical Oxygen Demand (COD) using aluminum sulphate was 81.5 %, and using thermal water was 75.4 %. In conclusion, thermal water has positive coagulation properties; therefore, it is a promising alternative to aluminum sulphate as a natural coagulant on the treatment of domestic wastewater.

scholarly journals Experimental Methodology of Optimum Coagulation Activity on River Water using Chemical and Natural Coagulants for Different PH Ranges

2019 ◽  
Vol 8 (9S3) ◽  
pp. 425-430
Keyword(s):  
Waste Water ◽  
River Water ◽  
Removal Efficiency ◽  
Orange Peel ◽  
Experimental Methodology ◽  
Coagulation Activity ◽  
Turbidity Removal ◽  
Natural Coagulant ◽  
Optimum Dosage ◽  
Before And After

The present study is related to determination of optimum dosage of natural coagulant and chemical coagulant to bring down the turbidity of the considered river water by maintaining different pH ranges. The conversion of waste water into unpolluted water as became challenge now a days. In the present investigation, a focus is made on Turbidity characteristic of waste water and an attempt is made to treat water so as to utilize it by removing its turbidity. After removal of turbidity, the water should undergo again some stages of purification. Before undergoing further purification, water should be made turbid free. To make water a turbid free, two types of coagulants are considered in this present study which are natural coagulant and chemical coagulant. The coagulant is orange peel powder natural one and the other is Alum, a chemical coagulant. Three series of water samples were considered by varying pH values (6, 7 and 8.5). Other qualities of water like Turbidity, alkalinity and acidity were also tested before and after the process of coagulation. In this study an optimum dosage of coagulant was determined. The samples of river were collected from nearby flowing Kundu River, Nandyal (M), Kurnool (Dist)-A.P. The test results show that the optimum dosage of orange peel powder was found at 103 mg/l with 0.3 NTU Turbidity with Turbidity removal efficiency of 98.68%and by using Alum the optimum dosage was found at 26 mg/l with 0.3 NTU Turbidity with Turbidity removal efficiency of 98.68%.

Application of New Complex Flocculant in Seawater Desalination Pretreatment

2014 ◽  
Vol 556-562 ◽  
pp. 57-59 ◽  
Author(s):  
Jun Cheng ◽  
Jing Zhang ◽  
Xiang Yu
Keyword(s):  
Removal Efficiency ◽  
Ferric Chloride ◽  
Removal Rate ◽  
Carboxymethyl Chitosan ◽  
Cod Removal ◽  
Optimal Dosage ◽  
Optimum Conditions ◽  
Turbidity Removal ◽  
Cod Removal Rate ◽  
Flocculation Effect

carboxymethyl chitosan modified to determine the optimum conditions for desalination pretreatment carboxymethyl chitosan (CMC): the optimal dosage of 8mg / L, turbidity removal efficiency of up to 92.8 %, COD removal rate was 53.25%; on this basis, polysilicon ferric chloride (PFSC) and carboxymethyl chitosan (CMC) for seawater flocculation experiments, the best dosage of carboxymethyl chitosan 2mg / L, polysilicon ferric chloride 0.2mg / L, turbidity of seawater reached 96.6%, COD removal efficiency reached 81.4%; and with a single flocculant for seawater flocculation effect is carried out.

Comparative Study on Anti-Fouling Properties and Application of Two PVDF Blend Membranes in Wastewater Treatment

2012 ◽  
Vol 550-553 ◽  
pp. 2164-2169
Author(s):  
Jian Ping Huang ◽  
Yu Min Shao ◽  
Li Li Liu ◽  
Chun Yan Ma
Keyword(s):  
Wastewater Treatment ◽  
Comparative Study ◽  
Removal Efficiency ◽  
Membrane Module ◽  
Step Method ◽  
Removal Rates ◽  
Turbidity Removal ◽  
Blend Membranes ◽  
Membrane Modules ◽  
Better Than

The filtration experiments of two PVDF blending membranes were performed. The critical fluxes of PVDF/PMMA and PVDF/TPU blend membranes were measured by the flux-step method. Then tubular membrane module PVDF/PMMA and PVDF/TPU were used to treat alcohol wastewater. The anti-fouling properties of PVDF/TPU membrane module were better than those of PVDF/PMMA membrane module. The critical fluxes of PVDF/PMMA and PVDF/TPU membrane modules were 24 L/(m2∙h) and 22 L/(m2∙h), respectively. In the alcohol wastewater treatment, TMP and SJ of the tested membranes remained stable during this period and membrane module B was more stable than membrane module A. The CODCr removal rates of two membrane modules reached 48% and 58%, respectively. And the UV254removal rates were 18% and 19%, respectively. Both the turbidity removal efficiency were more than 97% and the average effluent values were below 0.10NTU.

Comparative Study on the Different Coagulants for Mine Water

2013 ◽  
Vol 800 ◽  
pp. 89-92
Author(s):  
Xiao Guang Zhao ◽  
Yuan Yuan Guan ◽  
Jia Qi He ◽  
Zhu Gui Huang
Keyword(s):  
Organic Matter ◽  
Comparative Study ◽  
Chemical Oxygen Demand ◽  
Removal Efficiency ◽  
Mine Water ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Optimal Dosage ◽  
Turbidity Removal ◽  
Coagulation Tests

This article of mine water as the research object, using different coagulants (PAC, FC, AC) and coagulation tests of the mine water, to determine the removal of turbidity and organic matter most good coagulant PAC. Determine the optimal dosage of 16 mg / l, the mine water effluent turbidity removal efficiency of more than 90%, chemical oxygen demand CODCr removal rate reached more than 60%.

Comparative Study of Proactivators of the Fibrinolysin System in Three Mammalian Species

1969 ◽  
Vol 21 (03) ◽  
pp. 594-603 ◽  
Author(s):  
Y Takada ◽  
A Takada ◽  
J. L Ambrus
Keyword(s):  
Guinea Pig ◽  
Comparative Study ◽  
Human Plasma ◽  
Mammalian Species ◽  
Gel Filtration ◽  
Plasminogen Activators ◽  
The Other ◽  
Rabbit Plasma ◽  
Plate Test ◽  
Fibrin Plate

SummarySephadex gel filtration of human plasma gave results suggesting the presence of two proactivators of plasminogen, termed proactivators A and B.Activity resembling that of proactivator A was found in rabbit plasma, but not in guinea pig plasma.Plasminogen activators produced by the interaction of proactivator A of human plasma with streptokinase had no caseinolytic or TAMe esterolytic effect.Proactivator A can be separated in a form apparently free from plasminogen, as shown by the heated fibrin plate test and by immunological analysis. On the other hand, proactivator B concentrates prepared so far are contamined with plasminogen.Human proactivators appear to be far more susceptible to streptokinase than are rabbit proactivators.Inhibitors of the fibrinolysin system were observed in the plasmas of all 3 species. These inhibitors are not present in the euglobulin fraction of plasma. Sephadex fractionation of euglobulin fractions results in proactivator preparations that do not contain inhibitors.

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