Electrochemical oxidation is an effective technique for treating persistent organic pollutants, which are hardly removed in conventional wastewater treatment plants. Sulfate and chloride salts commonly used present natural influence the electrochemical degradation process. In this study, effect of electrolyte composition on active sulfate species (SO4●⁻ S2O82⁻) formation, benzotriazole degradation-a model compound, chlorinated by-products distribution have been investigated while using a...

Microbial electrosynthesis is a useful form of technology for the renewable production organic commodities from biologically catalyzed reduction CO2. However, to become applicable, process selectivity, stability and efficiency need strong improvement. Here we report on effect different electrochemical control modes (potentiostatic/galvanostatic) both start-up characteristics steady-state performance biocathodes using non-enriched mixed-culture inoculum. Based our results, it seems that...

We evaluated electrochemical degradation (ECD) and photocatalytic (PCD) technologies for saline water purification, with a focus on rate comparison formation of chlorinated aromatic intermediates using the same non-chlorinated parent compound, 4-ethylphenol (4EP). At 15 mA·cm-2, in absence chloride (0.6 mol·L-1 NaNO3 was used as supporting electrolyte), ECD resulted an apparent zero-order 30 μmol L-1·h-1, whereas rates ∼300 L-1·h-1 ∼3750 were computed low (0.03 mol·L-1) high NaCl...

The impact of chloride (Cl⁻) in heat-activated peroxydisulfate (PDS) and peroxymonosulfate (PMS) processes for benzotriazole (BTA) degradation was investigated. Results showed that 0.42 mM BTA could be degraded by PDS PMS under 70 °C presence absence Cl⁻. PMS-mediated rate increased with increasing Cl⁻ concentration up to 1000 mg/L, while a further increase decreased the rate. In contrast, inhibited PDS-mediated at concentrations tested between 100 10,000 mg/L. Radical scavenging experiments...

The reuse of cooling tower blowdown (CTBD) in the itself requires CTBD deionization and a pre-treatment before to remove organic compounds (OCs) that induce membrane fouling. This study assesses potential electrochemical oxidation (EO) with boron-doped diamond (BDD) Ti/RuO2 mixed-metal oxide (MMO) anode for pre-treatment. Also, influence applied current density (j), initial pH, hydrodynamic conditions, supporting electrolyte on process performance was evaluated. Results show COD TOC removal...

A substantial part of the freshwater used in industry is consumed cooling towers. Cooling towers discharge saline tower blowdown (CTBD), and reuse CTBD can lower industrial footprint. This requires desalination a pre-treatment that removes organic chemicals before physico-chemical technologies to be applied efficiently. In present study, by combination electrochemical oxidation (EO) with boron-doped diamond (BDD) or mixed-metal oxide (MMO) anode vertical flow constructed wetland (VFCW) was...

Rapid sand filters (RSFs) have shown potential for removing organic micropollutants (OMPs) from groundwater. However, the abiotic removal mechanisms are not well understood. In this study, we collect two field RSFs that operated in series. The primary filter abiotically removes 87.5% of salicylic acid, 81.4% paracetamol, and 80.2% benzotriazole, while secondary only paracetamol (84.6%). collected is coated by a blend iron oxides (FeOx) manganese (MnOx) combined with matter, phosphate,...

Bio-Ethanol is a renewable; eco-friendly energy source can be produced from bio-mass (hemicelluloses). Pteris (fern) grown very fast and has not major economic importance but it reliable of hemicelluloses converted to bio-Ethanol. In the hydrolysis concentration glucose reaction rate was observed with respect different parameters, like pH, temperature, substrate diameter, loading. this study we found optimal NH4OH treatment as best among H2SO4, NH4OH, NaOH treatment. addition, pH 7,...

One of the major challenges in reusing cooling tower blowdown water (CTBD) utilizing membrane processes is its remaining organic compounds, e.g., humic substances leading to biofouling. Besides, possible abundance chloride CTBD imposes concern formation chlorinated by-products. To choose a pre-treatment process for studied composition, various advanced oxidation (AOPs), including electrooxidation (EO), photocatalytic degradation (PCD), heat-activated persulfate (PS), UVC/vacuum UV (UVC/VUV),...

For the first time in Bangladesh, a bench scale membrane bioreactor (MBR) unit was tested treating textile wastewater industry premises of EOS Textile Mills LTD, Dhaka for three months. The performance compared with that conventional activated sludge treatment plant, which is operation same premises. COD and BOD removal efficiency MBR reached to around 90% 80% respectively 20 days whereas plant as low 40-50% 38-40% respectively. outlet level remained stable spite fluctuation feed value,...

Water hyacinth containing a remarkable amount of cellulose which is found throughout the world as unusable material that can be used one promising source for production glucose, initial step to produce bio ethanol. In this current study different types treatments highest glucose concentration was obtained by hot water treated method. addition, produced from using cellulytic enzyme pseudomonas sp., isolated cow dung. Glucose and rate increases with increasing substrate loading, particle size...

As the gradual up-growing trend of industrialization and urbanization leading steady increment demand energy; eco-friendly, bio degradable, cost competitive promising source energy with high sustainability is toughly needed for new era modern world. Hydrolysis cellulose by cellulase enzymes a vital candidate this option. It solid-liquid heterogeneous reaction; strongly affected non-reaction resistances caused most notably crystalline structure; reaction environment parameters as temperature,...

This study focused on the generation of electricity from whey in a bio-fuel cell (BFC). Whey or Milk Serum is liquid remaining after milk has been curdled and strained. It by-product manufacture cheese casein Foods Sweets Company. was selected as electrolyte biofuel due to containing higher amount branched-chain amino acids (BCAA's).The pH value fresh 3.1-3.8. Three categories were used experiments included whey, preserved by thermal treatment with 2% phenol volume. observed that...

A bacterial isolate Pseudomonas sp. was isolated from the solid waste slump collected a local duping site of Sylhet district and efficiently utilized for removal dye (Orange 3R) simulated synthetic water in lab scale Stirred Tank Sequencing Batch Bioreactor (STSBBR) batch mode. reactor with 2 L capacity (working volume 0.5 L) equipped suitable control means stirring mechanism operated at room temperature pH 6.6 ± 1 fill-react-settling-draw mode different initial concentrations (50, 100, 150,...

In this study, a cost effective, simple, environment friendly way of fermentable reducing sugar production from rice straw has been carried out by using naturally grown raw wood rotting enzyme. The rotten bark three trees was collected as the source enzyme, called enzyme strain. yield strain at various operating condition studied. A kinetic model expression developed for enzymatic hydrolysis process based on Michaelis – Mentens approach. Comparison between experimental data and theoretical...

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The impact of chloride (Cl⁻) in heat-activated peroxydisulfate (PS) and peroxymonosulfate (PMS) processes for benzotriazole (BTA) degradation was investigated. PMS-mediated BTA rate showed an optimum at a Cl⁻ concentration 1000 mg/L, while inhibited PS-mediated degradation. mainly driven by hydroxyl sulfate radicals both PS PMS systems without Cl⁻. However, reactive chlorine species (RCS) significantly boosted the system presence LC-MS/MS analysis identified forty-two transformation products...