Highly cost-effective removal of 2,4-dichlorophenoxiacetic acid by peroxi-coagulation using natural air diffusion electrode

A one-pot synthesis is described to construct a composite of the amino-derivative Zr carboxylate metal–organic framework and silica gel (UiO-66-NH2@silica) as an efficient solid sorbent for hexavalent chromium.

Download Full-text

Ionic Liquid Based CO2 Capturing Fuel Cell for Greenhouse Gas Reduction

MRS Proceedings ◽

10.1557/proc-1082-q08-02 ◽

2008 ◽

Vol 1082 ◽

Author(s):

Michal V. Wolkin ◽

Raphael Stumpp ◽

Karl Littau

Keyword(s):

Ionic Liquid ◽

Ionic Liquids ◽

Fuel Cell ◽

Cost Effective ◽

Operating Conditions ◽

Capture Process ◽

Aerospace Applications ◽

Effective Removal ◽

Co2 Capturing ◽

Cell Electrolytes

ABSTRACTRoom-temperature ionic liquids are utilized in a new CO2 capturing fuel cell. The cell is aimed at the efficient and cost effective removal of CO2 emitted from transportation related sources. The CO2 is captured from the atmosphere and is later converted into carbon free synthetic fuel such as methanol. In this study we optimized the operating conditions and the cell electrolytes. With ionic liquids such as 1-Butyl-1-methylpyrrolidinium dicyanamide, the extraction efficiencies increased to ∼20% while simultaneously making the capture process more robust. The ionic liquid approach is also compared to existing aqueous electrochemical CO2 concentration previously proposed by NASA for aerospace applications but with much lower efficiencies.

Download Full-text

An integrated process of methanol coagulation and side stream membrane bioreactor for treatment of rice gruel wastewater

10.21203/rs.3.rs-39334/v2 ◽

2020 ◽

Author(s):

Shaik Nazia ◽

Karishma Mishra ◽

Veeriah Jegatheesan ◽

Suresh K Bhargava ◽

Sridhar Sundergopal

Keyword(s):

Membrane Bioreactor ◽

Oxygen Demand ◽

Domestic Wastewater ◽

Cost Effective ◽

Total Dissolved Solids ◽

Water Production ◽

Integrated Process ◽

Aqueous Methanol ◽

Side Stream ◽

Effective Removal

Abstract Significant demand for water supply was to expect forthcoming decades. Production of reusable water from industrial and domestic wastewater is a feasible, cost-effective, and significant positive benefit to the environment. In the present study, the domestic rice gruel wastewater (RGW) treated with aqueous methanol coagulation integrated aerobic membrane bioreactor (AMBR). Hydrophilized spiral wound 5 kDa ultrafiltration membrane (HF – UF) used in the bioreactor for the effective removal of pollutants from RGW. Furthermore, the RGW pretreated with various coagulants such as methanol, ethanol, and HCl. The obtained pretreated RGW subjected to the HF-UF 5 kDa side stream AMBR for reusable water production. The experiments conducted to determine the turbidity, conductivity, total dissolved solids (TDS), and chemical oxygen demand (COD) found to be 96 %, 91 %, 91 %, and 94.6 %. The overall process was feasible, compact, environmentally free, cost-effective, eco-friendly.

Download Full-text

Effect of different sediment dewatering techniques on subsequent particle sizes in industrial derived effluent

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2019-0269 ◽

2020 ◽

Vol 47 (10) ◽

pp. 1145-1153 ◽

Cited By ~ 2

Author(s):

M. Alimohammadi ◽

H.A. Tackley ◽

C.B. Lake ◽

I. Spooner ◽

T.R. Walker ◽

...

Keyword(s):

Particulate Matter ◽

Organic Contaminants ◽

Chemical Properties ◽

Primary Source ◽

Cost Effective ◽

Effective Removal ◽

Dioxins And Furans ◽

Physical And Chemical ◽

Size Distribution Of Particles

A paucity of literature has compared geotextile dewatering methods to more conventional dewatering methods (i.e., centrifuge, sedimentation) in the context of how geotextile dewatering performs at reducing particulate matter in dewatering effluent. Particulate matter is the primary source of inorganic and organic contaminants (i.e., dioxins and furans) in an unconsolidated sediment (estimated 577 000 m3) that has accumulated in a wastewater stabilization basin in Nova Scotia, Canada. Physical and chemical properties of contaminated sediment were initially characterized, and subsequent laboratory experiments were carried out for three common dewatering methods: sedimentation, centrifugation, and geotextile filtration. Filtrate quality of suspended solids (number, particle size distribution of particles) was examined for differences based on three dewatering techniques assessed. All three methods provided effective removal of particulate matter during dewatering, but geotextile dewatering could be a more cost-effective and practical solution for dewatering of these sediments.

Download Full-text

Sequestration of hexavalent chromium from aqueous solutions by activated carbon derived from Macadamia nutshells

Water Science & Technology ◽

10.2166/wst.2016.506 ◽

2016 ◽

Vol 75 (1) ◽

pp. 196-206 ◽

Cited By ~ 12

Author(s):

V. E. Pakade ◽

O. B. Nchoe ◽

L. Hlungwane ◽

N. T. Tavengwa

Keyword(s):

Activated Carbon ◽

Aqueous Solutions ◽

Hexavalent Chromium ◽

Activated Carbons ◽

Cost Effective ◽

Sorption Process ◽

Freundlich Model ◽

Optimum Parameters ◽

Effective Removal ◽

Efficient Adsorbent

The purpose of this study was to investigate the feasibility of activated carbons prepared from Macadamia nutshells as an efficient adsorbent for the removal of hexavalent chromium (Cr(VI)) from aqueous solutions. The activated carbon was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), CHNS analyzer and Brunauer–Emmett–Teller (BET). For effective removal of Cr(VI), the optimum parameters found were pH 2, 120 min of contact time and 0.2 g of sorbent. The adsorption data fitted well into the Freundlich model, suggesting a multilayer sorption process. The results demonstrated that Macadamia activated carbon could be used as cost-effective biosorbent for the treatment of aqueous solutions contaminated by Cr(VI) with an adsorption capacity of 22.3 mg g−1. The mode of removal involved adsorption and reduction of Cr(VI) to Cr(III).

Download Full-text

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

Water Science & Technology ◽

10.2166/wst.2019.328 ◽

2019 ◽

Vol 81 (7) ◽

pp. 1345-1353 ◽

Cited By ~ 2

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.

Download Full-text

Adsorptive removal of phosphate from aqueous solutions using lead–zinc tailings

Water Science & Technology ◽

10.2166/wst.2013.649 ◽

2013 ◽

Vol 67 (5) ◽

pp. 983-988 ◽

Cited By ~ 3

Author(s):

Shuncai Wang ◽

Rongzhuo Yuan ◽

Xueyong Yu ◽

Chaojie Mao

Keyword(s):

Laboratory Experiments ◽

Low Cost ◽

Ph Effect ◽

Cost Effective ◽

Phosphate Removal ◽

Phosphate Adsorption ◽

Isotherm Models ◽

Effective Removal ◽

Elovich Equation ◽

Lead Zinc

This study explored the feasibility of utilizing lead–zinc tailings for phosphate removal in laboratory experiments. The adsorption isotherm, kinetics and pH effect were examined in batch experiments. The Freundlich and Langmuir isotherm models were used for data fitting. The adsorption kinetics can be best described by the simple Elovich equation. The phosphate adsorption tends to decrease with the increase of pH, from 0.37 mg P/g at pH 2.05 to 0.12 mg P/g at pH 7.01, and tends to increase from 0.12 mg P/g at pH 7.01 to 0.64 mg P/g at pH 12.52. The actual phosphate removal on the tailings could be a consequence of adsorption and precipitation reactions with Fe, Al and Ca. Due to their low cost, this type of tailings has the potential to be utilized for cost-effective removal of phosphate from wastewater.

Download Full-text

Improving the thermoelectric power factor of PEDOT:PSS films by a simple two-step post-treatment method

e-Polymers ◽

10.1515/epoly-2017-0098 ◽

2017 ◽

Vol 17 (6) ◽

pp. 501-506 ◽

Cited By ~ 1

Author(s):

Soo-Kwan Kim ◽

Jun-Hyun Mo ◽

Jae-Yeop Kim ◽

Kwang-Suk Jang

Keyword(s):

Ethylene Glycol ◽

Thermoelectric Power ◽

Power Factor ◽

Low Cost ◽

Cost Effective ◽

Treatment Method ◽

Post Treatment ◽

Thermoelectric Power Factor ◽

Effective Removal ◽

Fine Control

AbstractThis study demonstrates a simple two-step post-treatment method for improving the thermoelectric power factor of low-cost poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) films. The dry re-dispersible PEDOT:PSS pellets are cost-effective, however, they exhibit extremely low thermoelectric performance. On treating with ethylene glycol followed by hydrazine, the power factor of the PEDOT:PSS films increased from 0.0632±0.0097 μW m−1K−2 to 13.3±1.5 μW m−1K−2. The enhancement might be attributed to the effective removal of the free, non-complexed PSS chains and fine control of the oxidation level of PEDOT by the two-step post-treatment.

Download Full-text

Purification of 1,3-Propanediol for Production of Polytrimethylene Terephthalate (PTT) from Biomass

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.320.191 ◽

2011 ◽

Vol 320 ◽

pp. 191-195 ◽

Cited By ~ 4

Author(s):

Yeon Ki Hong

Keyword(s):

Carboxylic Acid ◽

Carboxylic Acids ◽

Removal Efficiency ◽

Fermentation Broth ◽

Cost Effective ◽

Separation Process ◽

Ph Values ◽

Economic Production ◽

Effective Removal ◽

By Products

1,3-Propanediol (1,3-PDO) has received increasing attention due to usage as the monomer of biopolymer-polytrimethylene terephthalate (PTT) which can be produced from bioresources. For the economic production of 1,3-PDO, the deveolpment of cost effective removal process of by-products such as carboxylic acids from its fermentation broth. Amien-based extraction is the separation process using reactions between amine and materials extracted. The extractabilities for carboxylic acid increased with amine concentration and decreased with pH values. It was also observed that the removal efficiency of carboxylic acids from 1,3-PDO solution was above 90% without any coextraction of 1,3-PDO. From this work, it was found that the amine-based extraction can be promising separation process for the production of pure 1,3-PDO.

Download Full-text