scholarly journals Removal efficiency for emerging contaminants in a WWTP from Madrid (Spain) after secondary and tertiary treatment and environmental impact on the Manzanares River

2021 ◽  
pp. 152567
Author(s):  
F.J. Lopez ◽  
E. Pitarch ◽  
A.M. Botero ◽  
D. Fabregat-Safont ◽  
M. Ibáñez ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Removal Efficiency ◽  
Emerging Contaminants ◽  
Tertiary Treatment

scholarly journals Environmental impact of emerging contaminants from battery waste: A mini review

2021 ◽  
Vol 3 ◽  
pp. 100104
Author(s):  
Elda M. Melchor-Martínez ◽  
Rodrigo Macias-Garbett ◽  
Alonso Malacara-Becerra ◽  
Hafiz M.N. Iqbal ◽  
Juan Eduardo Sosa-Hernández ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Emerging Contaminants

Treatment of petrochemical wastewater by UV/H2O2 photodecomposed system

1997 ◽  
Vol 36 (12) ◽  
pp. 357-365 ◽  
Author(s):  
Lain-Chuen Juang ◽  
Dyi-Hwa Tseng ◽  
Shyh-Chaur Yang
Keyword(s):  
Small Molecules ◽  
Removal Efficiency ◽  
Aromatic Compounds ◽  
Biological Process ◽  
Tertiary Treatment ◽  
Petrochemical Wastewater ◽  
Activity Inhibition ◽  
High Alkalinity ◽  
Pre Treatment ◽  
Raw Wastewater

The potential advantages of the UV/H2O2 process treating petrochemical wastewater as the tertiary treatment or the direct pre-treatment were demonstrated. While the high alkalinity of wastewater was not reduced, the UV/H2O2 process as the tertiary treatment could not obtain removal efficiency of wastewater. If the system pH adjusts to 3, this process will polish the effluent of the current biological process to meet the National Effluent Standards of 1998. The results of the direct pre-treatment with the UV/H2O2 process revealed that the recalcitrant compounds presented in raw wastewater would be destroyed to small molecules and might reduce some degree of activity inhibition to bioculture. In the detoxified investigation of spiking aromatic compounds, this process could obtain a good removal efficiency, including a lot of COD removal and the complete detoxification.

Degradation of acetaminophen (ACT) by ozone/persulfate oxidation process: experimental and degradation pathways

2020 ◽  
Vol 49 (5) ◽  
pp. 363-368
Author(s):  
Maryam Khashij ◽  
Mohammad Mehralian ◽  
Zahra Goodarzvand Chegini
Keyword(s):  
Removal Efficiency ◽  
Emerging Contaminants ◽  
Oxidation Process ◽  
Batch Reactor ◽  
Degradation Efficiency ◽  
Content Type ◽  
Persulfate Oxidation ◽  
Personal Care Product ◽  
Pathway Inference ◽  
Pharmaceutical Degradation

Purpose The purpose of this study to investigate acetaminophen (ACT) degradation efficiencies by using ozone/persulfate oxidation process in a batch reactor. In addition, the effects of various parameters on the ACT removal efficiency toward pathway inference of ACT degradation were investigated. Design/methodology/approach The experiments were in the 2 L glass vessels. Ozone gas with flow rate at 70 L.h−1 was produced by ozone generator. After the adjustment of the pH, various dosages of persulfate (1, 3, 5, 7 and 9 mmol.L−1) were then added to the 500 mL ACT-containing solution with 150 mg.L−1 of concentration. Afterward, ozone gas was diffused in glass vessels. The solution after reaction flowed into the storage tank for the detection. The investigated parameters included pH and the amount of ozone and persulfate addition. For comparison of the ACT degradation efficiency, ozone/persulfate, ozone and persulfate oxidation in reactor was carried out. The ACT concentration using a HPLC system equipped with 2998 PDA detector was determined at an absorbance of 242 nm. Findings ACT degradation percentage by using ozone or persulfate in the process were at 63.7% and 22.3%, respectively, whereas O3/persulfate oxidation process achieved degradation percentage at 91.4% in 30 min. Degradation efficiency of ACT was affected by different parameter like pH and addition of ozone or persulfate, and highest degradation obtained when pH and concentrations of persulfate and ozone was 10 and 3 mmol.L−1 and 60 mg.L−1, respectively. O3, OH• and SO4− were evidenced to be the radicals for degradation of ACT through direct and indirect oxidation. Gas chromatography–mass spectrometer analysis showed intermediates including N-(3,4-dihydroxyphenyl) formamide, hydroquinone, benzoic acid, 4-methylbenzene-1,2-diol, 4-aminophenol. Practical implications This study provided a simple and effective way for degradation of activated ACT as emerging contaminants from aqueous solution. This way was conducted to protect environment from one of the most important and abundant pharmaceutical and personal care product in aquatic environments. Originality/value There are two main innovations. One is that the novel process is performed successfully for pharmaceutical degradation. The other is that the optimized conditions are obtained. In addition, the effects of various parameters on the ACT removal efficiency toward pathway inference of ACT degradation were investigated.

Elimination of Pollutants and Emerging Contaminants in Piggery Wastewater Treatment Plants

2012 ◽  
Vol 518-523 ◽  
pp. 1924-1928
Author(s):  
Lei Tong ◽  
Ping Li ◽  
Yi Xian Shao ◽  
Yan Xin Wang
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Emerging Contaminants ◽  
Wastewater Treatment Plants ◽  
Anaerobic Fermentation ◽  
Nitrogen And Phosphorus ◽  
Piggery Wastewater ◽  
Multi Stage ◽  
Antibiotics Residues ◽  
Final Effluent

Piggery wastewater includes a lot of hardly degradable pollutants, which are not well removed during treatment plants. In our study, a multi-stage wastewater treatment system was introduced, which contains liquid-solid separation, anaerobic fermentation, aerobic treatment, functional material filtration and oxidation processes. In RPAFR, the readily biodegradable organic matter was degraded, and the removal efficiency of COD and BOD5reached 80%; but nitrogen and phosphorus could not be removed effectively. When MEOD and MFMI were operated to treat digested effluent, nitrogen and phosphorus were effectively removed. The removal of three kinds of antibiotics (FQs, SMs and TCs) in piggery wastewater treatment plants were detected, and for most antibiotics, more than 90% compounds were eliminated, but only few of them were totally removed in wastewater of final effluent. The weather also influenced the removal efficiency of DC, CIP and SMZ, which were better in autumn than spring, however, the whole trend of antibiotics elimination were similar in different weather. Different kinds of antibiotics residues in final effluent enhanced the ecological risk of environmental waters and human health.

Tertiary treatment of municipal wastewater using bioflocculating micro-algae

1991 ◽  
Vol 18 (6) ◽  
pp. 940-944 ◽  
Author(s):  
J. B. Sérodes ◽  
E. Walsh ◽  
O. Goulet ◽  
J. de la Noue ◽  
C. Lescelleur
Keyword(s):  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Ammonia Nitrogen ◽  
Design Criteria ◽  
Tertiary Treatment ◽  
Deep Basin ◽  
Sequential Batch Reactor ◽  
N Removal

Design criteria of a pilot plant for treating secondary municipal effluents using filamentous, bioflocculating micro-algae were evaluated. Using a sequential batch reactor, the best removal rate of ammonia nitrogen was reached for 25% draw volume; at 20–22 °C, up to four cycles per day could be achieved giving a removal efficiency of approximately 2 g of N per day and per square meter of basin (200 mm deep) with negligible nitrogen residual; increasing the water level by increments of 200 mm (from 200 to 600 mm) increased the N removal efficiency in a way similar to an increase in the number of renewals per day on a 200 mm deep basin. The dominant micro-algae (Chlorhormidium) was heavily influenced by the water temperature. Key words: micro-algae, municipal wastewater, water treatment, ammonia nitrogen, removal rate, removal efficiency.

scholarly journals Photocatalytic abatement of emerging pollutants in pure water and wastewater effluent by TiO2 and Ce-ZnO: degradation kinetics and assessment of transformation products

2019 ◽  
Vol 18 (4) ◽  
pp. 845-852 ◽  
Author(s):  
Debora Fabbri ◽  
María José López-Muñoz ◽  
Alessandro Daniele ◽  
Claudio Medana ◽  
Paola Calza
Keyword(s):  
Removal Efficiency ◽  
Emerging Contaminants ◽  
Degradation Kinetics ◽  
Pure Water ◽  
Transformation Products ◽  
Emerging Pollutants ◽  
Wastewater Effluent ◽  
Transient Transformation ◽  
Water And Wastewater

A good removal efficiency was obtained for a mixture of seven emerging contaminants in wastewater effluent using two catalysts, Ce-ZnO and TiO2-SG, as evidenced by the formation of several transient transformation products.

scholarly journals Comparative study for the treatment of domestic wastewater using Chlorella Vulgaris

2020 ◽  
Author(s):  
Nandini Moondra ◽  
Namrata Jariwala ◽  
Robin A Christian
Keyword(s):  
Removal Efficiency ◽  
Suspended Solids ◽  
Statistical Significance ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Tertiary Treatment ◽  
Environment Friendly ◽  
Secondary Contamination ◽  
One Way Anova ◽  
Maximum Removal

Abstract Tertiary treatment using chemicals frequently prompts secondary contamination of sludge, making additional issues of safe disposal. Thus, vitality and cost required for tertiary treatment of wastewater stay an issue for industries and municipalities. In this study, different microalgal concentrations 360 mL (20%), 450 mL (25%), 540 mL (30%), 630 mL (35%), 720 mL (40%) and 810 mL (45%) were studied to treat domestic wastewater for 11 hours of detention time for both filtered and non-filtered effluent. During the study, removal was observed in Total Solids (TS), Total Dissolved Solids (TDS), Total Suspended Solids (TSS), Electrical Conductivity (EC), phosphate, ammonia and Chemical Oxygen Demand (COD) for all the microalgal concentrations mentioned. 30% microalgal concentration showed maximum removal efficiency among different microalgal concentrations studied. Maximum removal efficiency found in non-filtered effluents when treated with 30% microalgal concentration was 96.60, 91.73 and 84.71% respectively for ammonia, phosphate and COD concentration. However, the removal efficiency increased to 97.62, 92.47 and 88.75% respectively for ammonia, phosphate and COD in the case of filtered effluents. In the case of TSS and EC, removal efficiency reached up to 30.87 and 24.31% respectively for non-filtered effluents while it was 48.00 and 25.88% respectively, for the filtered effluents. One-way ANOVA was also conducted to determine the statistical significance of the study. The study showed that an algae-based system could accomplish a more affordable and environment-friendly way to treat domestic wastewater without tertiary treatment to a desirable limit.

Tertiary Treatment of Paper Industries Effluent with Advanced Electrochemical Oxidation Process in the Presence of Modified Bentonite Powdery Electrodes

2013 ◽  
Vol 690-693 ◽  
pp. 1065-1068 ◽  
Author(s):  
Zhen Wang ◽  
Ze Sheng Cheng ◽  
Yu Liu ◽  
Na Na Bo ◽  
Ying Liu
Keyword(s):  
Removal Efficiency ◽  
Current Density ◽  
Paper Industry ◽  
Three Dimensional ◽  
Electrode System ◽  
Pulp And Paper ◽  
Tertiary Treatment ◽  
Modified Bentonite ◽  
Cost Treatment ◽  
Pulp And Paper Effluent

Tertiary treatment wascarried out to treat pulp and paper effluent from secondary treatment processby a three-dimensional electrode system equipped with modifiedbentonites as powdery electrode. The cetyl trimethylammonium bromide modified bentonite (CTAB-bent) and hydroxy-aluminum pillaredorganic bentonite (OH-Al-CTAB-bent) were synthesized and characterized by XRDand FTIR spectroscopy analysis.The impacts such as the dosage of particle electrode, electrolysis times,current density were on the COD removal efficiency and decolorization effect ofeffluent were also investigated. The results showed that the experimentscarried out by three-dimensional electrode system with OH-Al-CTAB-bent weresufficient for the COD and color removal efficiency. A current density of 30mA/cm2, electrolysis time of 40min, and the particle electrodedosage of 1.6g/L were selected as an optimum conditions that allows fast andlow cost treatment. The effluent can achieve the discharge standard of waterpollutants for pulp and paper industry (GB3544-2008) after electrolysis.

scholarly journals Comparative study for Treatment of Domestic Wastewater Using Chlorella Vulgaris

2020 ◽  
Author(s):  
Nandini Moondra ◽  
Namrata Jariwala ◽  
Robin A Christian
Keyword(s):  
Removal Efficiency ◽  
Suspended Solids ◽  
Domestic Wastewater ◽  
Total Suspended Solids ◽  
Total Dissolved Solids ◽  
Tertiary Treatment ◽  
Environment Friendly ◽  
Concentration Maximum ◽  
Secondary Contamination ◽  
Maximum Removal

Abstract Tertiary treatment using chemicals frequently prompts secondary contamination of sludge, making other issues of safe disposal. Thus, vitality and cost required for tertiary treatment of wastewater stay an issue for industries and municipalities. In this study, different microalgal concentrations (20%, 25%, 30%, 35%, 40% and 45%) were studied to treat domestic wastewater at 11 hours HRT for both filtered and non- filtered effluent. During the study, removal was observed in Total Solids (TS), Total Dissolved Solids (TDS), Total Suspended Solids (TSS), Electrical Conductivity (EC), phosphate, ammonia and COD for all the microalgal concentrations mentioned. However, the maximum removal efficiency was observed at 30% microalgal concentration. Maximum removal efficiency found in ammonia, phosphate and COD for non-filtered effluent was 96.60%, 91.73% and 84.71% respectively, whereas, in the case of the filtered sample, removal efficiency reached up to 97.62%, 92.47% and 88.75% for ammonia, phosphate and COD respectively. In the case of solids (specifically TSS) and EC, removal efficiency reached up to 30.87% and 24.31% respectively for non-filtered effluent and was 48.00% and 25.88% in the filtered sample. The study showed that an algae-based system could accomplish more affordable and environment-friendly way to treat domestic wastewater without tertiary treatment to a desirable limit.

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