Abstract This review provides updated information on the application of Fenton process as an advanced oxidation method for treatment industrial wastewaters. technology has been used in recent decades a chemical addressed to meet variety objectives including final polishing, reduction high percentages organic load terms oxygen demand or total carbon and removal recalcitrant toxic pollutants thus allowing further conventional biological treatment. The efficiency flexibility this proven with...

Phenol oxidation by Fenton's reagent (H2O2 + Fe2+) in aqueous solution has been studied depth for the purpose of learning more about reactions involved and extent process, under various operating conditions. An initial phenol concentration 100 mg/L was used as representative a phenolic industrial wastewater. Working temperatures 25 50 °C were tested, pH set at 3. The H2O2 Fe2+ doses varied range 500−5000 1−100 mg/L, respectively, corresponding to 1−10 times stoichiometric ratio. A series...

Hydrothermal carbonization is emerging as a promising eco-friendly technology for the management of wet biomass wastes through energy recovery. It avoids drying feedstock and operates at much lower temperature than conventional thermal conversion technologies, giving rise to carbonaceous solid, hydrochar, improved fuel quality with respect starting biomass. However, aqueous fraction resulting from this process, so-called process water, represents troublesome secondary waste requiring...

This study investigates the energy recovery from sewage sludge by combining hydrothermal carbonization and aqueous phase reforming of generated process water. The treatment was carried out at 170 °C 230 for 1 h, produced a hydrochar with adequate physicochemical properties, such as higher heating value (20–24 MJ kg−1) than sludge, improved fuel ratio (0.2–0.5) broad comprehensive combustion index (5.8 × 10−7 to 10.0 min−2 °C−3). Aqueous water 220 25–29 bar 4 h. A maximum H2 yield 98.7 mmol...

The feasibilities of the anaerobic co-digestion two most relevant biowastes, food waste and garden park waste, were evaluated compared with hydrothermal treatment each raw biowastes process water generated. effects on stability energy recovery also analyzed. Anaerobic digestion was best option for from an energetic point view, 81% stored in feedstock, while highest obtained solid fraction generated (85.5%). In addition, 5% showed a similar to that only (∼80%), thus improving biological process.

Nitrate (NO3–) pollution of water bodies is a serious environmental problem worldwide. One the major concerns about NO3– contamination lack cost-effective solutions for its removal from potential drinking resources. Current technologies, such as ion exchange, reverse osmosis and electrodialysis, produce reject with high concentration. Catalytic reduction an emerging technology, capable transforming into harmless N2. A critical issue to achieve almost complete selectivity this last species so...

Hydrothermal carbonization allows material valorization and energy recovery from wet biomass waste. In this study, the hydrothermal treatment of dewatered waste-activated sludge (DWAS) was evaluated at several temperatures (170–230 °C) reaction times (5–60 min) in an acid-free medium or media such as citric acid HCl (0.1–0.5 mol/L). Compared with DWAS, increase fixed carbon content (>45 wt%) heating value (18.9–22.9 MJ/kg) observed hydrochar; however, their ash remained high, which is main...

Abstract The thermochemical treatments of biowaste yield alternative renewable carbon-rich materials, while achieving waste valorization. These technologies allow to reduce amount and enhance its life span avoiding the landfill disposal. agronomic application as a soil amendment strategy using fresh hydrochar (obtained via hydrothermal treatment garden park (GPW) at 180 °C for 1 h), post-treated (washed, aged, thermally treated), biochar pyrolysis GPW 900 90 min) has been studied compared in...

In this work, chicken meat and bones (C-MBM) waste is treated through a sequence of stages including hydrothermal treatment (HTT), nutrient recovery anaerobic digestion, with the aim evaluating their potential synergy as circular economy approach. HTT was carried out at 170, 200 230 °C, under non-acidic acidic conditions using 0.5 M HCl (HTT-A). Phosphorous from process water recovered by chemical precipitation addition Mg salt, liquid effluent anaerobically to degrade organic matter produce...

In this work, a novel strategy for food waste valorization was evaluated from an environmental life-cycle perspective. A system based on acid-assisted hydrothermal carbonization of combined with the exploitation hydrochar by combustion and process water through nutrient recovery stage subsequent anaerobic digestion, assessed compared stand-alone digestion as reference system. This combination processes aims to recover both nutrients in struvite precipitation energy biogas combustion. Both...

Hydrothermal carbonization (HTC) is a promising alternative to transform biomass waste into solid carbonaceous material (hydrochar) and process water with potential for energy recovery. In this study, two alternatives treatment by conventional acid-assisted HTC of swine manure are discussed. Process from at 180 °C showed high biodegradability (55% COD removal) methane production (∼290 mL STP CH4 g−1 CODadded) the in an upflow anaerobic sludge blanket reactor allowed obtaining yield (1.3 L...

The viscosity of diluted guar gum solutions and the xanthan mixture have been studied. Guar showed pseudoplastic behaviour. Apparent increased with concentration decreased temperature at which was measured. A maximum in plot versus increasing dissolution observed 60 °C. This behaviour related to differences molecular structure polymers solved different temperatures. Mixtures a higher combined than that occurring each separate gum. synergistic interaction affected by ratio both gums. effect...

The hydrodechlorination of 4-chlorophenol in an aqueous phase was studied a semicontinuous basket stirred tank reactor using Pd, Pt, and Rh on γ-alumina commercial catalysts (0.5% w/w) under mild reaction conditions. catalytic activity the temperature range 20−40 °C. Pd showed higher than Pt. From consumption evolution products, phenol, cyclohexanone, cyclohexanol, scheme based parallel-series pathway kinetic model pseudo-first-order dependence have been proposed. Hydrodechlorination to...