scholarly journals UVA-LED Technology’s Treatment Efficiency and Cost in a Competitive Trial Applied to the Photo-Fenton Treatment of Landfill Leachate

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1026
Author(s):  
Javier Tejera ◽  
Antonio Gascó ◽  
Daphne Hermosilla ◽  
Víctor Alonso-Gomez ◽  
Carlos Negro ◽  
...  
Keyword(s):  
Landfill Leachate ◽  
Mercury Vapor ◽  
Cod Removal ◽  
Treatment Efficiency ◽  
Alternative Source ◽  
Effluent Quality ◽  
Radiation Sources ◽  
Initial Ph ◽  
Pre Treatment ◽  
Set Up

The objective of this trial was to assess the application of UVA-LED technology as an alternative source of irradiation for photo-Fenton processes, aiming to reduce treatment costs and provide a feasible treatment for landfill leachate. An optimized combination of coagulation with ferric chloride followed by photo-Fenton treatment of landfill leachate was optimized. Three different radiation sources were tested, namely, two conventional high-pressure mercury-vapor immersion lamps (100 W and 450 W) and a custom-designed 8 W 365 nm UVA-LED lamp. The proposed treatment combination resulted in very efficient degradation of landfill leachate (COD removal = 90%). The coagulation pre-treatment removed about 70% of the COD and provided the necessary amount of iron for the subsequent photo-Fenton treatment, and it further favored this process by acidifying the solution to an optimum initial pH of 2.8. The 90% removal of color improved the penetration of radiation into the medium and by extension improved treatment efficiency. The faster the Fenton reactions were, as determined by the stoichiometric optimum set-up reaction condition of [H2O2]0/COD0 = 2.125, the better were the treatment results in terms of COD removal and biodegradability enhancement because the chances to scavenge oxidant agents were limited. The 100 W lamp was the least efficient one in terms of final effluent quality and operational cost figures. UVA-LED technology, assessed as the application of an 8 W 365 nm lamp, provided competitive results in terms of COD removal, biodegradability enhancement, and operational costs (35–55%) when compared to the performance of the 450 W conventional lamp.

Use of dairy reject and fermented Aleo sp. Leaf Gel mixture in the biological Pre-treatment of landfill leachate

2018 ◽  
Vol 13 (1) ◽  
pp. 219-228 ◽  
Author(s):  
Kasmi Mariam ◽  
Elleuch Lobna ◽  
Abidi Haifa ◽  
Cherni Yassmine ◽  
Hosni Cyrine ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Organic Matter ◽  
Size Effect ◽  
Landfill Leachate ◽  
Yeast Strain ◽  
Oxygen Demand ◽  
Treatment Efficiency ◽  
Chemical Oxygen Demand Removal ◽  
Pre Treatment ◽  
Aloe Gel

Abstract In this study the biotreatability of Jebel Chakir landfill leachate (Tunisia) using a mixture of dairy industry reject (bactofugate) and Aloe sp. leaf gel was evaluated. The effect of Aloe gel fermentation using Saccharomyces cerevisiae yeast strain was investigated against some selected bacterial and fungal strains. The inoculation size effect of the treatment mixtures (2, 6, 10 and 12%) in the treatment efficiency was also studied. The obtained results showed that when natural Aloe gel and bactofugate mixtures were used the recorded chemical oxygen demand removal rates exceeded 56% within 48 h of treatment. Whereas, the use of the fermented Aloe gel in the treatment mixtures has promoted the organic matter removal to reach 72%.

scholarly journals Pre-treatment of industrial landfill leachate by Fenton’s oxidation

2013 ◽  
Vol 9 (1) ◽  
pp. 51-56
Keyword(s):  
Reaction Time ◽  
Landfill Leachate ◽  
Oxidation Reaction ◽  
Organic Load ◽  
Solution Ph ◽  
Reaction Solution ◽  
Fenton’S Oxidation ◽  
Initial Ph ◽  
Pre Treatment ◽  
Fenton's Oxidation

Biological treatment (aerobic and anaerobic) of industrial landfill leachate is limited by the presence of toxic contaminants (e.g., heavy metals) and recalcitrant (biopersistent) organics (e.g., polyphenols, pharmaceuticals, cosmetics, etc.,), hindering viable conditions for biomass proliferation in biological reactors, with difficulties in meeting concentration limits imposed by applied regulations. Fenton’s oxidation by the use of Fe2+-H2O2-H+ mixture may be used as a pre-treatment of industrial landfill leachate for preliminary abatement of the organic load and to improve biodegradability (BOD/COD>0.4) to favour biological oxidation in conventional wastewater treatment plants. Leachate from Grottaglie (S.E. Italy) non-hazardous landfill (pH 8.6; COD=11.000 mg l-1; BOD5=2.400 mg l-1; NH4-N=2.900 mg l-1; conductivity=60.000 μS cm-1) was laboratory tested in different operative conditions, i.e., initial pH, Fe2+/H2O2 ratio, concentrations and reaction time. The oxidation reaction was monitored by equilibrium pH and residual COD and BOD5 concentrations. Best operative conditions were obtained at pH 3, Fe2+=700 mg l-1, H2O2=9,900 mg l-1 (H2O2/Fe2+ratio~13w/w), reaction time=2h. Following the oxidation reaction, solution pH was neutralized by the addition of Ca(OH)2 or NaOH (120 meq l-1) for further abatement of target parameters by precipitation/sorption. Preliminary technical/economical evaluation of possible process schemes is also given in the paper.

scholarly journals Cost-effective removal of COD in the pre-treatment of wastewater from the paper industry

2019 ◽  
Vol 81 (7) ◽  
pp. 1345-1353 ◽  
Author(s):  
Joanna Boguniewicz-Zablocka ◽  
Iwona Klosok-Bazan ◽  
Vincenzo Naddeo ◽  
Clara A. Mozejko
Keyword(s):  
Wastewater Treatment ◽  
High Efficiency ◽  
Paper Industry ◽  
Cost Effective ◽  
Operating Conditions ◽  
Cod Removal ◽  
Process Efficiency ◽  
Effective Removal ◽  
Initial Ph ◽  
Pre Treatment

Abstract The present paper reveals results of research for cost-effective removal of chemical oxygen demand (COD) contained in industrial paper mill effluent. Not only process efficiency but also wastewater treatment costs are discussed. Different pre-treatment processes are applied aiming to investigate the COD removal before discharge to the municipal sewage network. The objective of this paper is to find the optimal operating conditions for the coagulation process. The effects of key operational parameters, including the type of coagulant, initial pH, temperature and coagulant dose, on COD percentage removal were investigated. The laboratory experiments confirmed the high efficiency of chemically enhanced mechanical treatment towards COD. The data obtained show that even low dose of chemicals provides sufficient COD reduction. The initial pH of the wastewater had a significant impact on the COD removal. Under the optimal operational conditions (pH = 7.5, T = 18 °C) the treatment of wastewater from paper industries by coagulation has led to a reduction of 70% COD for wastewater discharged. In terms of the investigated paper industry wastewater, polyaluminium chloride appears to be most suitable for treatment of high COD concentration. However, in an economic evaluation of requirements for wastewater treatment, operating costs and associated saving were such that PAX was more favourable.

REDUCTION OF COD IN NAM SON LANDFILL LEACHATE BY ELECTRO-FENTON AS SECONDARY TREATMENT AFTER ELECTROCOAGULATION PRETREATMENT

2019 ◽  
Vol 57 (6) ◽  
pp. 724
Author(s):  
Son Thanh Le ◽  
Khai Cao LE
Keyword(s):  
Landfill Leachate ◽  
High Strength ◽  
Potential Method ◽  
Ammonia Nitrogen ◽  
Operating Conditions ◽  
Secondary Treatment ◽  
Fenton Process ◽  
High Concentration ◽  
Initial Ph ◽  
Pre Treatment

Landfill leachate is a high-strength wastewater that is most difficult to deal with because the fluctuating of composition and quality as well as high concentration of specific pollutants (PAH, PCBs, heavy metals) and very high ammonia nitrogen and COD concentrations. So, after a pre-treatment as electrocoagulation, over 73% of COD has been treated from Nam Son landfill leachate, however the output value of COD still exceeds the QCVN 40:2011/BTNMT, column B. So, an electro-fenton process was employed to secondarily treat Nam Son landfill leachate, after an electrocoagulation pre-treatment.  This electro-fenton system used a Pt gauze anode and a commercial carbon felt cathode to electrogenerate in situ hydrogen peroxide and regenerate ferrous ion as catalyst. In this study, the effects of various operating conditions such as initial pH, concentration of Fe2+ catalyst, current applied on reduction of COD in Nam Son landfill leachate were examined. At the optimal condition: applied current of 1A, pH 3, Fe2+ concentration of 0.1m M, Na2SO4 concentration of 0.05 M, 77.2% COD reduction can be reached within 60 min and the output value of COD is 130.9 mg.L-1, according to QCVN 40:2011/BTNMT, column B. The research results indicated that electro-fenton process can promise as a potential method in practice for secondary treatment of landfill leachate.

scholarly journals Optimizing electrocoagulation process using experimental design for COD removal from unsanitary landfill leachate

2017 ◽  
Vol 76 (11) ◽  
pp. 2907-2917 ◽  
Author(s):  
Aysenur Ogedey ◽  
Mehtap Tanyol
Keyword(s):  
Current Density ◽  
Landfill Leachate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Main Process ◽  
Electrode Distance ◽  
Electrocoagulation Process ◽  
High Pollution ◽  
Pre Treatment ◽  
Treatment Step

Abstract Leachate is the most difficult wastewater to be treated due to its complex content and high pollution release. For this reason, since it is not possible to be treated with a single process, a pre-treatment is needed. In the present study, a batch electrocoagulation reactor containing aluminum and iron electrodes was used to reduce chemical oxygen demand (COD) from landfill leachate (Tunceli, Turkey). Optimization of COD elimination was carried out with response surface methodology to describe the interaction effect of four main process independent parameters (current density, inter-electrode distance, pH and time of electrolysis). The optimum current density, inter-electrode distance, pH and time of electrolysis for maximum COD removal (43%) were found to be 19.42 mA/m2, 0.96 cm, 7.23 and 67.64 min, respectively. The results shown that the electrocoagulation process can be used as a pre-treatment step for leachate.

scholarly journals The SHARON process in the treatment of landfill leachate

2010 ◽  
Vol 61 (1) ◽  
pp. 47-52 ◽  
Author(s):  
A. Vilar ◽  
M. Eiroa ◽  
C. Kennes ◽  
M. C. Veiga
Keyword(s):  
Organic Matter ◽  
Landfill Leachate ◽  
Previous Treatment ◽  
Cod Removal ◽  
Partial Nitrification ◽  
Ammonium Concentration ◽  
Partial Nitritation ◽  
Pre Treatment ◽  
Anammox Process ◽  
Sharon Process

The purpose of this paper was to study the partial nitrification of the nitrogen present in a landfill leachate applying the SHARON process in order to obtain a suitable effluent to the ANAMMOX process. As a first step, the SHARON reactor was fed anaerobically pre-treated leachate at an ammonium concentration of 2,000 mg N/L (1.1 kg N/m3 d). In such conditions, the average ammonium and nitrite concentrations in the effluent were 775 mg N/L and 1,225 mg N/L, respectively. During this period the COD removal was very low since most of the biodegradable organic matter was removed in the anaerobic pre-treatment. Afterwards, the SHARON reactor was fed leachate without a previous treatment and the efficiency of the partial nitritation diminished. As well, the COD removal increased, achieving a percentage around 28%.

RBC Treatment of a Municipal Landfill Leachate: A Pilot Scale Evaluation

1985 ◽  
Vol 20 (3) ◽  
pp. 115-125 ◽  
Author(s):  
C. Peddle ◽  
J.W. Atwater
Keyword(s):  
Landfill Leachate ◽  
Sewage Treatment ◽  
Pilot Scale ◽  
Treatment Efficiency ◽  
Rotating Biological Contactor ◽  
Carbon Removal ◽  
Effluent Quality ◽  
Municipal Landfill ◽  
Trace Organics ◽  
High Treatment

Abstract This study evaluated the on-site treatment of a weak municipal landfill leachate with a Rotating Biological Contactor (RBC) at pilot scale (0.9 m dia.). The leachate generally had COD and NH3-N values of less than 1000 mg/L and 50 mg/L respectively. A high treatment efficiency for both carbon removal and nitrification was achieved despite variable and intermittent loading conditions. The effluent filtrable BOD5 was generally less than 10 mg/L and the effluent NH3-N concentration was usually less than 1.0 mg/L. This effluent quality was achieved at mass loading levels comparable to those for sewage treatment (10.0 kg BOD5/ 1000 m2 · d for carbon removal and 0.7 kg TKN/1000 m2·d). An aside to this study showed that trace organics, some of which are on the EPA priority pollutant list, were present in this leachate and were effectively removed by the RBC.

scholarly journals The effect of sodium percarbonate dose on the reduction of organic compounds in landfill leachate

2019 ◽  
Vol 86 ◽  
pp. 00002 ◽  
Author(s):  
Joanna Muszyńska ◽  
Jarosław Gawdzik ◽  
Mikołaj Sikorski
Keyword(s):  
Hydrogen Peroxide ◽  
Landfill Leachate ◽  
Alternative Source ◽  
Sodium Percarbonate ◽  
Remediation Efficiency ◽  
Before And After ◽  
Iron Sulphate ◽  
Pre Treatment ◽  
Initial Process ◽  
Different Doses

The paper discusses the issue of using classic Fenton’s reagent modification for pre-treatment of leachate from a landfill in Janczyce (Świętokrzyskie Voivodeship, Poland) – sodium percarbonate (2Na2CO3·3H2O2) was used as an alternative source of hydrogen peroxide, and hydrated iron sulphate ((II) FeSO4·7H2O) was the source of iron ions. The tests were carried out at initial process pH = 3, for different doses of the Fe2+ catalyst (ranging within 100÷5400 mgFe/L), and for mass ratio iron (II) to sodium percarbonate – 1:3. Three doses were selected after this stage, for which the following parameters were examined: the effect of initial process pH ranging between 2 and 4, the effect of oxidation process duration (30÷150 min.), and the effect of the ratio Fe2+ to sodium percarbonate (1:3, 1:5 and 1:7). The values of selected parameters (pH, COD, TOC) in leachates, both before and after the treatment process have been determined according to applicable standards. Completed tests have proven, inter alia, that the proposed implementation of the Fenton’s method with sodium percarbonate may be an effective alternative for hydrogen peroxide as an oxidiser; with an increasing dose of the 2Na2CO3.3H2O2, the improvement in landfill leachate remediation efficiency measured by decreasing TOC and COD values reaches certain extent only; the process modified with sodium percarbonate may be effective already at pH=4.

scholarly journals STUDY ON LEACHATE TREATMENT AFTER ELECTROCOAGULATION PROCESS BY BIO-FILTER SYSTEM: A CASE STUDY IN NAM SON LANDFILL, HA NOI

2018 ◽  
Vol 55 (4C) ◽  
pp. 251
Author(s):  
Le Cao Khai
Keyword(s):  
Experimental System ◽  
Potential Method ◽  
Treatment Efficiency ◽  
Leachate Treatment ◽  
Filter System ◽  
System A ◽  
Electrocoagulation Process ◽  
Pre Treatment ◽  
High Concentrations ◽  
Set Up

One of the major pollution issues caused by the municipal solid waste landfill is leachate, which creates a huge risks to contaminate groundwater, surface water as well as surrounding land quality. The leachate of Nam Son landfill contains high concentrations of pollutants such as COD, BOD5, NH4+-N. Hence, this study focused on setting up a bio-filter system and investigating its performance on Nam Son landfill leachate after pre-treatment by electrocoagulation (EC). The characteristics of raw leachate for bio-treatment were as following: pH = 8.7 - 8.9, COD = 1391 – 1492 mg/L, NH4+-N = 661 - 818 mg/L. The experimental system was set up with use volume of 20 lit (dimension: l = 0.15 m, w = 0.28 m and h = 0.52 m) in conditions: room temperature (25-32oC) flow rate from 2 – 6 L/day, bio-media had a specific surface of 200 m2/m3. The experimental results were found that COD treatment efficiency from 78–96 % with input COD load from 0.12 – 0.45 kg/m3/day. The NH4+-N treatment efficiency from 98–99.9 % with input NH4+-N load from 0.08 ÷ 0.25 kg/m3/day. The research results indicated that the leachate treatment by combination of electrocoagulation and bio-filter system can promise as a potential method in practice.

Evaluation of Small Wastewater Treatment Plants in the County of Århus – Denmark

1993 ◽  
Vol 28 (10) ◽  
pp. 33-41
Author(s):  
Jes la Cour Jansen ◽  
Bodil Mose Pedersen ◽  
Erik Moldt
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Biological Treatment ◽  
Wastewater Treatment Plants ◽  
Chemical Precipitation ◽  
Common Type ◽  
Treatment Efficiency ◽  
Effluent Quality ◽  
Different Types

Influent and effluent data from about 120 small wastewater treatment plants (100 - 2000 PE) have been collected and processed. Seven different types of plants are represented. The effluent quality and the treatment efficiency have been evaluated. The most common type of plant is mechanical/biological treatment plants. Some of them are nitrifying and some are also extended for chemical precipitation of phosphorus. Constructed wetlands and biological sandfilters are also represented among the small wastewater treatment plants.

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