scholarly journals Optimization studies on turbidity removal from cosmetics wastewater using aluminum sulfate and blends of fishbone

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Prosper E. Ovuoraye ◽  
Victor I. Ugonabo ◽  
Gina F. Nwokocha
Keyword(s):  
Removal Efficiency ◽  
Environmental Protection Agency ◽  
Industrial Wastewater ◽  
Cost Benefit Analysis ◽  
Correlation Coefficients ◽  
Cost Benefit ◽  
Settling Time ◽  
Quadratic Model ◽  
Optimal Conditions ◽  
Turbidity Removal

AbstractThis research is centered on the optimization of coagulation–flocculation treatment of cosmetic wastewater. It analyzes blends of fishbone (BFB) and aluminum-based coagulant (ABC) to determine the efficacy of BFB as a potential coagulant–flocculants aid at optimum conditions using response surface methodology (RSM). The experiment was carried out employing the standard nephelometric procedure at 1000 rpm stirring rate. The central composite design (CCD) was used to examine the interactions of pH, dosage, and settling time to maximize the turbidity removal efficiency of the ABC- and BFB-driven coag–flocculation. The optimal pH, dosage, and settling time for ABC were obtained as 10, 0.1 g/L, and 2 min, while pH 6, 0.4 g/L, and settling time of 4 min were recorded for BFB following the established quadratic model of the RSM. The removal efficiency of ABC and BFB plots 80% and 88%, respectively; this corresponds to 262 NTU and 288 NTU of removal from the wastewater at optimal conditions. The kinetics result indicated that the rate constant (Kf) 3 × 10−3 (L/g min) of BFB surpassed 5 × 10−5 (L/g min) recorded for ABC following second-order coag–flocculation reaction, with correlation coefficients (R2) values of 0.999 and 0.9985, respectively. The research also applied cost–benefit analysis for the determination of the efficacy of BFB. The figure obtained shows that the benefit of using BFB will save $5.50 compared to ABC based on this work. At optimal conditions, BFB satisfied the environmental protection agency pH standard for industrial wastewater discharge, promising coagulant–flocculants aid for industrial wastewater purification purpose and the preservation of the environment.

Mercury and Air Toxics Standards: Co-Benefits and the Courts in U.S. Cost-Benefit Analysis

2018 ◽  
Vol 2 (1) ◽  
pp. 1-10
Author(s):  
Arik Levinson
Keyword(s):  
Environmental Protection Agency ◽  
Power Plants ◽  
Impact Analysis ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Recent Change ◽  
Mercury Pollution ◽  
Regulatory Impact Analysis ◽  
Regulatory Impact ◽  
The U.S

In April 2017, the U.S. Court of Appeals in Washington DC agreed with the U.S. Environmental Protection Agency (EPA) to delay indefinitely a lawsuit over the Agency’s regulation governing mercury pollution from power plants. Lawyers for the EPA argued that they needed time to evaluate the status of the lawsuit, due to “the recent change in Administration.” The case, Murray v. EPA, centers on the Agency’s analysis of the benefits of reducing mercury pollution. Key to that litigation is the EPA’s treatment of co-benefits—the incidental reductions to pollutants aside from mercury. As of this writing, the Agency has still not decided how to proceed. This case summarizes the EPA’s 2011 Regulatory Impact Analysis at the heart of the legal dispute.1

scholarly journals Treatment of High-Strength Animal Industrial Wastewater Using Photo-Assisted Fenton Oxidation Coupled to Photocatalytic Technology

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1553 ◽  
Author(s):  
Jae Hong Park ◽  
Dong Seok Shin ◽  
Jae Kwan Lee
Keyword(s):  
Light Intensity ◽  
Removal Efficiency ◽  
Industrial Wastewater ◽  
Uv Light ◽  
High Strength ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Optimal Conditions ◽  
Experimental Conditions ◽  
Animal Wastewater

Animal wastewater is one of the wastewaters that has a color and is difficult to treat because it contains a large amount of non-degradable organic materials. The photo-assisted Fenton oxidation technique was applied to treat animal wastewater, and the optimal conditions of chemical oxygen demands (COD) removal were analyzed according to changes in pH, ferrous ion, H2O2, and ultraviolet (UV) light intensity as a single experimental condition. Experimental results showed that, under the single-factor experimental conditions, the optimal conditions for degradation of animal wastewater were pH 3.5, Fe(II) 0.01 M, H2O2 0.1 M, light intensity 3.524 mW/m2. Under the optimal conditions, COD removal efficiency was 91%, sludge production was 2.5 mL from 100 mL of solution, color removal efficiency was 80%, and coliform removal efficiency was 99.5%.

A Partial Review of Seven Official Guidelines for Cost-Benefit Analysis

2020 ◽  
Vol 11 (2) ◽  
pp. 272-293 ◽  
Author(s):  
Peter Abelson
Keyword(s):  
Environmental Protection Agency ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Economic Benefits ◽  
Benefit Analysis ◽  
Social Discount Rate ◽  
Protection Agency ◽  
The Social ◽  
Benefit Cost ◽  
Over Time

AbstractThis paper reviews seven contemporary official guidelines to cost-benefit analysis (CBA) with respect to eight major cost-benefit issues drawing on the latest edition of the major CBA textbook for guidance, although not complete authority. The guidelines are those by UK Treasury, European Commission, U.S. Environmental Protection Agency, New Zealand Treasury, Infrastructure Australia, NSW State Treasury, and Victorian State Department of Treasury and Finance. The eight major issues discussed are the issue of standing, core valuation principles, the scope of CBA with reference to potential additional economic benefits, changes in real values over time, the marginal excess tax burden, the social discount rate, use of benefit-cost ratios, and treatment of risk. While all the guidelines are quality guides to CBA, the paper finds that there is room for improved discussion and practice at various points in each of these guidelines.

scholarly journals Synthesis and Performance of PAFS Coagulant Derived from Aluminium Dross

2022 ◽  
Vol 30 (1) ◽  
pp. 547-563
Author(s):  
Shiyi Li ◽  
Shafreeza Sobri
Keyword(s):  
Wastewater Treatment ◽  
Sulfuric Acid ◽  
Removal Efficiency ◽  
Sulfuric Acid Concentration ◽  
Settling Time ◽  
Optimum Conditions ◽  
Turbidity Removal ◽  
Preparation Conditions ◽  
Water Ph ◽  
Aluminium Dross

Polymerised aluminium ferric sulphate (PAFS) was prepared from aluminium dross as a coagulant in wastewater treatment. The effects of leaching time, leaching temperature, and sulfuric acid concentrations on the turbidity removal of the wastewater were investigated, and the optimum conditions were determined using response surface methodology. The results showed that the optimum PAFS preparation conditions were at a leaching time of 60 minutes, a leaching temperature of 65°C, and a sulfuric acid concentration of 1 mol/L. Furthermore, experiments were performed to investigate the effect of coagulant dosages using the PAFS prepared under the optimum leaching conditions, settling time and initial pH of the wastewater on the turbidity removal efficiency. As a result, it was found that the optimum coagulation conditions for PAFS coagulants were at a settling time of 15 minutes, coagulant dosage of 0.5g, and raw water pH 8. Under these optimum conditions, the turbidity removal efficiency of the wastewater was 91.45%. The purpose of this study was to investigate the possibility of aluminium dross utilisation as a coagulant agent for wastewater treatment. Therefore, it can be concluded that PAFS prepared by leaching metal oxides from aluminium dross is an effective wastewater coagulant.

Advanced Processing of Biologically-Treated Papermaking Wastewater by Poly-Aluminum Chloride (PAC)

2013 ◽  
Vol 409-410 ◽  
pp. 129-132
Author(s):  
Yong Qiang Zhu ◽  
Yu Ling Feng ◽  
Hai Ying Zhang ◽  
Zhan Jun Zhang
Keyword(s):  
Removal Efficiency ◽  
Aluminum Chloride ◽  
Industrial Wastewater ◽  
Optimal Dosage ◽  
Optimal Conditions ◽  
Wastewater Discharge ◽  
Paper Making ◽  
Stirring Time ◽  
Papermaking Wastewater

In this study, biologically treated paper-making wastewater was treated using PAC to study removal efficiency of color as a function of pH and dosage of PAC. It was found that PAC was relatively effective in removing color from biologically papermaking wastewater. The optimal dosage, pH and stirring time were 40 mL L-1, 5 and 30 min, respectively. Effluent color after coagulation at the optimal conditions was 40 PCU, meeting requirements of Industrial Wastewater Discharge Standard of Pulping and Papermaking (GB3544-2008) . Therefore, PAC dosage of 40 mL L-1 and pH of 5 were recommended for treatment of biologically treated papermaking wastewater.

scholarly journals Cost-Benefit Analysis at the Supreme Court: Cooling Water v. Fish

2009 ◽  
Vol 38 (2) ◽  
pp. 83-99
Author(s):  
Julie A. Hewitt
Keyword(s):  
Supreme Court ◽  
Environmental Protection Agency ◽  
Cost Benefit Analysis ◽  
Cooling Water ◽  
Cost Benefit ◽  
Court Case ◽  
Benefit Analysis ◽  
Ecosystem Valuation ◽  
Supreme Court Case ◽  
The Cost

This is the story of a recent U.S. Supreme Court case on the use of cost-benefit analysis at the U.S. Environmental Protection Agency (EPA) for a regulation issued under the Clean Water Act (CWA). The case is Entergy Corp. v.Riverkeeper, Inc., et al. The case was not about the quality of the cost-benefit analysis, nor the fact that EPA conducted one, but whether EPA had CWA authority to base regulatory decisions on cost-benefit. I close with thoughts about an alternative Chevron legal test that acknowledges the state of ecosystem valuation.

Cost-Benefit Analysis Methodology: Install Commercially Compliant Engines on National Security Exempted Vessels?

2015 ◽  
Author(s):  
Jonathan DeHart ◽  
Kimberly Nastase ◽  
William Remley ◽  
Stephen Luzzi
Keyword(s):  
National Security ◽  
Environmental Protection Agency ◽  
Cost Benefit Analysis ◽  
Health Benefit ◽  
Cost Benefit ◽  
National Defense ◽  
Analysis Methodology ◽  
Regulatory Impact ◽  
Marine Engines ◽  
The Cost

The Environmental Protection Agency (EPA) national security exemption (NSE) status can be applied to new and existing U.S. flagged vessels having a national defense mission and meeting associated criteria. Benefits of installing noncompliant marine engines on NSE vessels may include preserving a vessel class’ primary defense mission capability and engine configuration control. The drawback is increased emissions. An objective and versatile methodology framework was developed to quantify the cost-benefit tradeoff for NSE vessels, vehicles, and equipment. The parametric-based comparison of one-time and ongoing costs with monetized health benefit (utilized in conventional regulatory impact analyses) satisfactorily encompasses the fundamentals of environmental health risk and can be applied to all mobile and stationary equipment types.

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