scholarly journals PÓS-TRATAMENTO DE LIXIVIADO ESTABILIZADO POR CICLO COMPLETO, ADSORÇÃO E OXIDAÇÃO QUÍMICA

2021 ◽  
Vol 12 (3) ◽  
pp. 85-102
Author(s):  
Marcella Yuri Almeida Sawaguchi ◽  
Emily Giany Assunção ◽  
Isabela Bruna de Tavares Machado Bolonhesi ◽  
Gabriela Fonseca da Costa ◽  
Vilson Gomes da Assunção Júnior
Keyword(s):  
Organic Matter ◽  
Removal Efficiency ◽  
Fenton Reaction ◽  
Test Organism ◽  
Color Removal ◽  
Nitrogenous Compounds ◽  
Treated Effluent ◽  
Complementary Techniques ◽  
High Concentrations ◽  
True Color

The leachatefrom landfillhas high concentrations of organic matter, humic and nitrogenous compounds, heavy metals and inorganic salts, which requiresproper treatment for its final destinationand does not cause damage to the environment. Studies show that the biologically treated effluent requires an association of physical-chemical techniques.Thisstudy aimed to evaluate the application of complementary techniques to thebiological treatmentsuch as coagulation-flocculation-sedimentation(CFS)andFenton's reaction oxidation(FR), followed by adsorption. The CFS with ferric chloride and FRpost-treatments isolated had100% and 87,9%, organic mattercorrelated with true color removal and 53,6% and 67,0% of CODremoval,which meetwiththe requirements of CONAMA 357/05 e 430/11 for disposal in water bodies. The adsorption after Fenton reaction resulted in 84,5% organic matter correlated with true color removal and 67,0% of CODremoval. Adsorption after coagulation-flocculation-sedimentation was able to reduce 76,9% of COD. CFSshowed higher removal efficiency of organic matter correlated to the true color, while RFobtained higher removal efficiency of NKT, N-ammoniacal and COD parameters. The biologically treated leachate did not show significant toxicityacute to the test organism saline artemia, however, after the post-treatment, acute ecotoxicity in the limits established by CEMA 81/10.

Enhanced pathogen removal in on-site biofiltration systems over organic filtration materials

2008 ◽  
Vol 3 (2) ◽  
Author(s):  
Marco A. Garzón-Zúñiga ◽  
Ana C. Tomasini-Ortíz ◽  
Gabriela Moeller-Chavez ◽  
Yolanda Hornelas-Uribe ◽  
Gerardo Buelna ◽  
...  
Keyword(s):  
Organic Matter ◽  
Removal Efficiency ◽  
Water Reuse ◽  
Municipal Wastewater ◽  
Natural Fibers ◽  
Aeration Rate ◽  
Treated Effluent ◽  
Low Concentrations ◽  
Colony Forming Units ◽  
Tropical Conditions

Municipal wastewater was treated in 4 biofilters packed with a mix of endemic tropical woodchips and natural fibers to evaluate the removal efficiency of organic matter and pathogen microorganisms under tropical conditions. Biofilters were operated during 400 days, with a hydraulic rate of 0.3 m3/m2.d and an aeration rate of 0.68 m3air/m2 h-1. Raw municipal wastewater presented higher concentrations, of organic matter and pathogens, than those reported for municipal wastewaters in temperate countries. However, pollutants were successfully removed: <98.5% of the organic matter as BOD5 < 99.99% of Faecal Coliforms (FC) and Total Colony Forming Units (TCFU), and < 96.93% Helminth eggs (HE) were removed remaining only very low concentrations in the treated effluent (≤2.5 mg DBO5/L; ≤ 240 FC/100 mL; ≤ 240 TCFU /100 mL and < 1.0 HE/5L). According with Mexican regulations (Nom 001-SEMARNAT, 1996) and with the EPA suggested guidelines for water reuse (U.S. EPA, 1992a) treated effluents with this quality can be safely reused for three main activities: Nonfood crop irrigation, landscape impoundments and for construction activities. The high removal efficiency of TCFU and FC may be related with a predatory activity of testate amoebas which were detected growing into the biofilters and, the most plausible hypothesis concerning HE removal is that they are retained by filtration over the organic materials.

Characterization of Treated Effluent from a Chemithermomechanical Pulping Process Using Macroporous Resins

1997 ◽  
Vol 32 (4) ◽  
pp. 795-814 ◽  
Author(s):  
K.M. Agbekodo ◽  
P.M. Huck ◽  
S.A. Andrews ◽  
S. Peldszus
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
Oxygen Demand ◽  
Macroporous Resins ◽  
Treated Effluent ◽  
Chlorine Demand ◽  
Potential Impact ◽  
High Concentrations ◽  
Chemithermomechanical Pulping

Abstract This study developed a characterization of the organic matter remaining in a chemithermomechanical pulping (CTMP) effluent after biological treatment and evaluated the potential impact of this effluent when discharged into the receiving environment. The methodology employed involved fractionation with macroporous resins to allow for the isolation of hydrophobic and hydro-philic organic materials. The study also examined the treated effluent’s reactivity with chlorine, a typical drinking water disinfectant, in order to assess the formation potential of chlorinated by-products and the chlorine demand in a downstream drinking water treatment plant. Results showed that the dissolved organic carbon (DOC) in a treated effluent from a CTMP mill consisted of 87% hydrophobic material (primarily humic substances), 5% hydrophilic acids and 3 to 4% nitrogenous compounds. At least 95% of the DOC was isolated using three different macroporous resins. The chlorine demand of the biotreated CTMP effluent was two to three times higher than is typical for natural organic matter from surface water. This indicated that the organic material in the CTMP effluent was highly reactive with chlorine and will likely be reactive with other oxidants such as ozone, which is also applied in the drinking water industry. Moreover, the disinfection by-products chloroform and trichloroacetic acid were formed in high concentrations as a result of chlorination. The biotreated CTMP effluent had a high chemical oxygen demand (at least 1,100 mg/L) but a relatively low biochemical oxygen demand (less than 100 mg/L), which was to be expected after biological treatment. Hence, discharge of these effluents could release high concentrations of non- or slowly biodegradable organic matter into the downstream aquatic environment. Water pollution control policies should therefore consider the potential impact of treated effluents from CTMP mills with regard to their high DOC and the potential for chlorinated by-product formation upon drinking water disinfection.

Review: Effects of soil organic matters on Fenton reaction

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Somayeh Akbari ◽  
Segaheyedeh P Jalilian. Ahmadkalaei
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Removal Efficiency ◽  
Organic Contaminants ◽  
Fenton Reaction ◽  
Heterogeneous Fenton ◽  
Heterogeneous Fenton Reaction ◽  
In The Beginning ◽  
The Impact

Heterogeneous Fenton reaction has been widely known to destruct organic contaminants, in its basic application definition, by applying one or more Fe2+ or Fe3+-containing source(s) with hydrogen peroxide for producing the strong hydroxyl radicals. Comprehensive experiments in the Fenton reaction area have been done for over 100 years, and considerable progress has been achieved. Achieved removal efficiency by Fenton reaction is usually studied by evaluating the effects of parameters such as initial reagents concentrations, pH, and soil organic matter (SOM). Among them, the results related to the effect of SOM sometimes seem conflicting, as its effects are reported either promoting or inhibiting and sometimes both. Reaction parameters such as initial reagents and pH are the most studied and effective ones in evaluating the effects of SOM on Fenton reaction for organic pollutants. This review intends to give a comprehensive survey of the impact of SOM on the Fenton reaction, with the focus on the heterogeneous Fenton reaction in the soil and solid. For this purpose, the general effects of pH and initial reagents on the Fenton reaction are reviewed in the beginning. Keywords: Fenton reaction, Hydrogen peroxide, pH, Soil organic matter (SOM), The removal efficiency

Application of a Pilot-Scale Pulsed Electrocoagulation system to OCC-Based Paper Mill Effluent

TAPPI Journal ◽  
2009 ◽  
Vol 8 (3) ◽  
pp. 14-20 ◽  
Author(s):  
YUAN-SHING PERNG ◽  
EUGENE I-CHEN WANG ◽  
SHIH-TSUNG YU ◽  
AN-YI CHANG
Keyword(s):  
Water Quality ◽  
Quality Indicators ◽  
Paper Mill ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Optimal Dosage ◽  
Water Quality Indicators ◽  
Paper Mill Effluent ◽  
Treated Effluent ◽  
True Color

Trends toward closure of white water recirculation loops in papermaking often lead to a need for system modifications. We conducted a pilot-scale study using pulsed electrocoagulation technology to treat the effluent of an old corrugated containerboard (OCC)-based paper mill in order to evaluate its treatment performance. The operating variables were a current density of 0–240 A/m2, a hydraulic retention time (HRT) of 8–16 min, and a coagulant (anionic polyacrylamide) dosage of 0–22 mg/L. Water quality indicators investigated were electrical con-ductivity, suspended solids (SS), chemical oxygen demand (COD), and true color. The results were encouraging. Under the operating conditions without coagulant addition, the highest removals for conductivity, SS, COD, and true color were 39.8%, 85.7%, 70.5%, and 97.1%, respectively (with an HRT of 16 min). The use of a coagulant enhanced the removal of both conductivity and COD. With an optimal dosage of 20 mg/L and a shortened HRT of 10 min, the highest removal achieved for the four water quality indicators were 37.7%, 88.7%, 74.2%, and 91.7%, respectively. The water qualities thus attained should be adequate to allow reuse of a substantial portion of the treated effluent as process water makeup in papermaking.

Removal efficiency of dissolved organic matter from secondary effluent by coagulation-flocculation processes

2020 ◽  
pp. 1-10
Author(s):  
Natália Rodrigues Guimarães ◽  
Fabiane Dörr ◽  
Rodrigo de Oliveira Marques ◽  
Ernani Pinto ◽  
Sidney Seckler Ferreira Filho
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Removal Efficiency ◽  
Secondary Effluent

CHEMICAL CHARACTERISTICS OF A NATURAL SOIL LEACHATE FROM A HUMIC PODZOL

1969 ◽  
Vol 49 (1) ◽  
pp. 151-158 ◽  
Author(s):  
M. Schnitzer ◽  
J. G. Desjardins
Keyword(s):  
Organic Matter ◽  
Fulvic Acid ◽  
Water Solubility ◽  
Structural Features ◽  
Natural Soil ◽  
Complexing Agent ◽  
Soil Leachate ◽  
Nitrogenous Compounds ◽  
Free Weight ◽  
Metal Organic

A leachate, collected in the field in a lysimeter placed between the Ae and Bhf horizon of a Humic Podzol in Newfoundland, was analyzed by chemical and spectroscopic methods.About 87% of the dry, ash-free weight of the leachate was fulvic acid, the remainder consisting mainly of polysaccharides and nitrogenous compounds. A comparison of the analytical characteristics of the purified leachate with those of extracted and purified Podzol Bh fulvic acid showed that the main structural features of the two materials were very similar. Judging from its high contents of oxygen-containing functional groups and from its water solubility, the organic matter in the leachate had all the characteristics of an efficient metal–complexing agent, capable of playing a significant role in metal–organic matter interactions in soils.An organic matter–silica sediment was isolated from the leachate, consisting of 47.6% organic matter and of 52.4% of almost pure SiO2∙nH2O. The organic matter in the sediment accounted for about 10% of the organic matter in the leachate. The isolation of the sediment suggests that investigations on interactions between compounds of silicon and humic substances deserve greater attention than they have so far received.

Study on De-Nitrification of Improved Step-Feed Progress

2014 ◽  
Vol 703 ◽  
pp. 171-174
Author(s):  
Bing Wang ◽  
Yi Xiao ◽  
Shou Hui Tong ◽  
Lan Fang ◽  
Da Hai You ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Fluidized Bed ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Operating Conditions ◽  
Removal Mechanism ◽  
Aerobic Zone

Improved step-feed de-nitrification progress combined with biological fluidized bed was introduced in this study. The progress had good performance and capacity of de-nitrification and organic matter. The experiment result showed that the de-nitrification efficiency of the improved biological fluidized bed with step-feed process was higher than the fluidized bed A/O process under the same water quality and the operating conditions. When the influent proportion of each segment was equal, the system showed good nitrogen removal efficiency with the change of influent C/N ratio, HRT and sludge return ratio. The removal rate of TN reached up to 88.2%. It showed that the simultaneous nitrification and de-nitrification phenomenon happened in the aerobic zone. The nitrogen removal mechanism was also studied.

scholarly journals Post-treatment of tannery wastewater using pilot scale horizontal subsurface flow constructed wetlands (polishing)

2017 ◽  
Vol 77 (4) ◽  
pp. 988-998 ◽  
Author(s):  
Tadesse Alemu ◽  
Andualem Mekonnen ◽  
Seyoum Leta
Keyword(s):  
Removal Efficiency ◽  
Batch Reactor ◽  
Subsurface Flow ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Surface Flow ◽  
Tannery Wastewater ◽  
Treated Effluent ◽  
Horizontal Subsurface Flow ◽  
Pollutants Removal

Abstract In the present study, a pilot scale horizontal subsurface flow constructed wetland (CW) system planted with Phragmites karka; longitudinal profile was studied. The wetland was fed with tannery wastewater, pretreated in a two-stage anaerobic digester followed by a sequence batch reactor. Samples from each CW were taken and analyzed using standard methods. The removal efficiency of the CW system in terms of biological oxygen demand (BOD), chemical oxygen demand (COD), Cr and total coliforms were 91.3%, 90%, 97.3% and 99%, respectively. The removal efficiency for TN, NO3− and NH4+-N were 77.7%, 66.3% and 67.7%, respectively. Similarly, the removal efficiency of SO42−, S2− and total suspended solids (TSS) were 71.8%, 88.7% and 81.2%, respectively. The concentration of COD, BOD, TN, NO3−N, NH4+-N, SO42 and S2− in the final treated effluent were 113.2 ± 52, 56 ± 18, 49.3 ± 13, 22.75 ± 20, 17.1 ± 6.75, 88 ± 120 and 0.4 ± 0.44 mg/L, respectively. Pollutants removal was decreased in the first 12 m and increased along the CW cells. P. karka development in the first cell of CW was poor, small in size and experiencing chlorosis, but clogging was higher in this area due to high organic matter settling, causing a partial surface flow. The performance of the pilot CW as a tertiary treatment showed that the effluent meets the permissible discharge standards.

An algal process treatment combined with the Fenton reaction for high concentrations of amoxicillin and cefradine

RSC Advances ◽  
2015 ◽  
Vol 5 (122) ◽  
pp. 100775-100782 ◽  
Author(s):  
Haitao Li ◽  
Yu Pan ◽  
Zhizhi Wang ◽  
Shan Chen ◽  
Ruixin Guo ◽  
...  
Keyword(s):  
Fenton Reaction ◽  
High Concentrations ◽  
Action Process ◽  
Combined Technique

The goal of the current study was to create a combined technique for the removal of two common antibiotics (amoxicillin and cefradine) using Fenton and an algal action process.

Simultaneous oxidation and reduction treatments of polluted water by a bio-electro reactor

1996 ◽  
Vol 34 (9) ◽  
pp. 101-108 ◽  
Author(s):  
M. Kuroda ◽  
T. Watanabe ◽  
Y. Umedu
Keyword(s):  
Aqueous Solution ◽  
Organic Matter ◽  
Electric Current ◽  
Removal Efficiency ◽  
Concentration Ratio ◽  
Nitrate Removal ◽  
Hydrogen Gas ◽  
Polluted Water ◽  
Simultaneous Oxidation ◽  
Denitrifying Microorganisms

Application of a bio-electro reactor for treatment of various kinds of polluted water was investigated experimentally. Aqueous solution of nitrate, ammonium and/or organic matter were used as synthetic polluted water. Denitrification of the nitrate polluted water without organic matter proceeded effectively by utilizing hydrogen gas produced by electrolysis of water in the reactor. The bio-electro reactor was also available for the treatment of nitrate polluted water containing organic matter when the C/N concentration ratio was up to 1.0 under the condition of 100 mA of applied electric current. The nitrate removal efficiency from nitrate polluted water containing acetate at C/N=1.0 was more than 90% at 5 hours of HRT and 80% even at 2.8 h HRT. For the treatment of ammonium polluted water, nitrification and denitrification proceeded simultaneously in a bio-electro reactor where nitrifying and denitrifying microorganisms were immobilized on the electrodes. The results obtained in this study suggested that the bio-electro reactor system was capable to application for oxidation and reduction treatments of the nitrate and ammonium polluted water.

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