Acid Recycling Articles on Environmental XPRT

Assessment of nanofiltration and reverse osmosis potentialities to recover metals, sulfuric acid, and recycled water from acid gold mining effluent

This work assessed the potential of nanofiltration (NF) and reverse osmosis (RO) to treat acid streams contaminated with metals, such as effluent from the pressure oxidation process (POX) used in refractory gold ore processing. NF and RO were evaluated in terms of rejections of sulfuric acid and metals. Regarding NF, high sulfuric acid permeation (∼100%), was observed, while metals were ...

Apr. 27, 2016

By IWA Publishing

An Eco-balance of a Recycling Plant for Spent Lead–Acid Batteries

This study applies Life Cycle Assessment (LCA) methodology to present an eco-balance of a recycling plant that treats spent lead–acid batteries. The recycling plant uses pyrometallurgical treatment to obtain lead from spent batteries. The application of LCA methodology (ISO 14040 series) enabled us to assess the potential environmental impacts arising from the recycling plants operations. Thus, ...

Feb. 1, 2005

By Springer

Effect of acetic acid in recycling water on ethanol production for cassava in an integrated ethanol–methane fermentation process

Recently, the integrated ethanol–methane fermentation process has been studied to prevent wastewater pollution. However, when the anaerobic digestion reaction runs poorly, acetic acid will accumulate in the recycling water. In this paper, we studied the effect of low concentration of acetic acid (≤25 mM) on ethanol fermentation at different initial pH values (4.2, 5.2 or 6.2). At an initial pH ...

Sep. 6, 2016

By IWA Publishing

Acid recycling in steel pickling plants: state-of-the-art and new developments in environmental protection

For acid pickling of heat-treated mild steel and steel products for up to the middle of the last century, sulphuric acid was primarily in use, which has been replaced since the 1960s stepwise by hydrochloric acid. During this time, also the pickling of high alloyed steel with hydrofluoric acid or mixtures of hydrofluoric acid together with nitric acid has been applied on industrial scale. The ...

Mar. 5, 2010

By Inderscience Publishers

Greener, Recyclable, and Reusable Ruthenium(III) Chloride/Polyethylene Glycol/Water System for the Selective Hydrogenation of Biomass-Derived Levulinic Acid to γ-Valerolactone

A versatile and efficient catalyst for the hydrogenation of biomass-derived levulinic acid to γ-valerolactone (GVL) by using a RuCl3/polyethylene glycol (PEG-400) /H2O catalyst system was developed. The catalysis system was also found to be active for the hydrogenation of levulinate ester. The present protocol proceeded with 99 % conversion and 99 % selectivity ...

Oct. 28, 2016

By SusChem

Wastewater Treatment & Recycle

Fresh water is a scarce commodity; this fact is well acknowledged by one and all. People at all levels be it general public, governmental bodies, and industries understand the implications of good quality water availability in terms of quantity, cost and wastage. As a consequence, there is a growing consensus on wastewater treatment for recycle/reuse. This paper briefly describes the treatment ...

Jul. 1, 2011

By Aquatech International Corporation

Adi-hybrid pilot study for treating acrylic acid and formaldehyde wastewater

ABSTRACT This paper summarizes the results of an anaerobic pilot study conducted on-site at the Eastman Chemical Company plant located in Sokolov, Czech Republic. One 800 L ADI-Hybrid pilot reactor was operated for 15 months from February 19, 2003 to May 23, 2004, treating selected petrochemical wastewater generated from the two Acrylic Monomers Plants (acrylic acid plants) on site. ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Photodegradation of aqueous bisphenol A using boric acid-doped titanium dioxide

A high-photoactivity boric acid-doped titanium dioxide (B-doped TiO2) photocatalyst of the degradation of aqueous bisphenol A (BPA) under sunlight was synthesized and characterized by scanning electron microscope, X-ray photoelectron spectroscopy and UV-vis diffuse reflectance. The band gap energies of TiO2 and B-doped TiO2 (B/Ti mole ratio = 0.2%) were 3.01 and 2.98, showing ...

Apr. 25, 2016

By IWA Publishing

Pilot test of pollution control and metal resource recovery for acid mine drainage

The study was undertaken in order to recover the metal resources from acid mine drainage (AMD). A 300 m3/d continuous system was designed and fractional precipitation technology employed for the main metals Fe, Cu, Zn, and Mn recovery. The system was operated for six months using actual AMD in situ. The chemicals' input and also the retention time was optimized. Furthermore, the ...

Sep. 5, 2015

By IWA Publishing

Treatment of iron(II)-rich acid mine water with limestone and oxygen

The main components of acid mine water are free acid, sulphate, and Fe2+. Limestone is the most cost-effective alkali that can be used for neutralization. The purpose of this investigation was to identify conditions where Fe2+ is removed with limestone and simultaneously oxidized with oxygen to Fe3+, in a polyvinyl chloride pipe under pressure. Gypsum ...

Jul. 23, 2014

By IWA Publishing

Chemical Industry: Wet Scrubber Passes Acid Anhydride Test Case Study

A leading U.S. chemical company upgraded air pollution control of maleic anhydride fumes at one of its overseas plants by installing a venturi scrubber. Selection of the scrubber was based on a pilot study to determine the percentage recovery and the maximum solution concentration of maleic anhydride that could be achieved using a wet scrubber. One significant reason for pretesting the ...

Feb. 16, 2016

By CR Clean Air Group, LLC

Anaerobic fermentation of organic solid wastes: volatile fatty acid production and separation

Anaerobic fermentation of organic municipal solid waste was investigated using a leach-bed reactor (LBR) to assess the volatile fatty acid (VFA) production efficiency. The leachate recycle rate in the LBR affected the VFA composition of the leachate. A six-fold increase in the recycle rate resulted in an increase of the acetic acid fraction of leachate from 24.7 to 43.0%. The separation ...

May 20, 2014

By IWA Publishing

Wastewater Recycling: Radiator Warehouse

Radiator Warehouse is a small company that has been able to compete and grow through innovation and a commitment to cleaner production. After surveying available technology for recycling water and reducing chemicals, it decided to develop its own, much simpler system at a cost of only $10,000. This was not only cheaper than available overseas technologies, but was also just half the cost of ...

Dec. 1, 1998

Acid dye removal from industrial wastewater by adsorption on treated sewage sludge

This study investigated the suitability of sewage sludge for the removal of Acid Blue 93 industrial wastewater. Washed sewage sludge (WS) and sludge activated carbon (AS) were used as adsorbents. The effect of pH, contact time, adsorbent dose and adsorption temperature was studied. Equilibrium isotherms for the adsorption were analysed by Freundlich and Langmuir isotherm models. The ...

Dec. 6, 2010

By Inderscience Publishers

The study of the recovery of highly purified terephthalic acid from alkali weight-reduction wastewater

A new process has been developed for recovering the terephthalic acid (TPA) with high purity from alkali weight-reduction wastewater. Three methods were used to purify the mother liquor: coagulation-sedimentation, carbon adsorption and the combination of these two methods. The results show that the nature of the TPA is greatly improved by coagulation-sedimentation or by carbon adsorption, ...

Jun. 27, 2007

By Inderscience Publishers

Exergy analysis of the process of wet-process phosphoric acid production with full utilisation of sulphur contained in the waste phosphogypsum

The wet-process phosphoric acid is produced by decomposition of phosphate raw materials with sulphuric acid. This gives a large amount of waste product-phosphogypsum. The thermochemical decomposition of phosphogypsum gives a gas rich in SO2. This gas is processed to obtain sulphuric acid, which is fed back into phosphoric acid production. The aim of this paper is to perform exergy analysis of the ...

Oct. 1, 2010

By Inderscience Publishers

Petro-Chemical Industry: Wet Scrubber Passes Acid Anhydride Test Case Study

A leading U.S. chemical company upgraded air pollution control of maleic anhydride fumes at one of its overseas plants by installing a venturi scrubber. Selection of the scrubber was based on a pilot study to determine the percentage recovery and the maximum solution concentration of maleic anhydride that could be achieved using a wet scrubber. One significant reason for pretesting the ...

Feb. 16, 2016

By CR Clean Air Group, LLC

SULFURIC ACID PLANT TAIL GAS CLEANUP WITH CANSOLV“ SYSTEM SO2 SCRUBBING TECHNOLOGY

The tail gas from a single absorption sulfuric acid plant typically contains 2000-3000 ppmv of unreacted SO2. Emission regulations for new plants in most jurisdictions today require cleanup of this stream prior to discharge into the atmosphere and many grandfathered units are being required to decrease emission levels. The current paradigm is to add a second stage of conversion, which reduces the ...

Sep. 8, 1997

By Shell Cansolv – Gas absorption solutions

Copper-spent activated carbon as a heterogeneous peroxydisulfate catalyst for the degradation of Acid Orange 7 in an electrochemical reactor

The exhausted activated carbon generated from the adsorption of heavy metal wastewater needs further treatment/disposal. In this study, a new application of copper-spent activated carbon (Cu-AC) was proposed. Cu-AC was used to activate peroxydisulfate (PDS) for the decolorization of Acid Orange 7 (AO7) and electrical current was introduced to enhance the process. The decolorization followed a ...

Jan. 18, 2016

By IWA Publishing

Reference: Clever water recycling with chlorine dioxide

Vapour water at the Crailsheim-Dinkelsbühl dairy is disinfected and then returned to the production process by means of a chlorine dioxide system. The great news is that this significantly reduces water consumption and operating costs. Fewer costs The 160 members of staff at the diary "Milchwerk Crailsheim-Dinkelsbühl eG" process around 130,000 tonnes of milk a year, ...

Jan. 18, 2016

By ProMinent Group - ProMinent GmbH

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