Biological Treatment of Wastewater from Pyrolysis Plant: Effect of Organics Concentration, pH and Temperature

Abstract

The biological treatment of the aqueous residue produced during poplar wood pyrolysis was investigated. The biological treatment experiments were carried out at two different pH conditions (controlled at 7, uncontrolled) in batch mode at three different temperatures (15 °C, 25 °C and 30 °C) and initial total organic carbon of the water ranging from 800 mg/L to 2800 mg/L. Results show that a substantial removal of organic carbon could be achieved in aerobic conditions after biomass acclimation. After 72 h of treatment, total organic carbon (TOC) removal mean values of 49.47% and 53.03% were observed at 30 °C for solution at 1400 and 2000 mg/L initial TOC, respectively. In the case of 1400 mg/L, a further mineralization (61.80%) was achieved during 144 h of treatment, by using a two-step process. A kinetic study of the process was also made, showing that organics mineralization followed a first-order kinetic model.

Synthesis and application of g-C3N4/Fe3O4/Ag nanocomposite for the efficient photocatalytic inactivation of Escherichia coli and Bacillus subtilis bacteria in aqueous solutions

“…In these catalysts, the electrons lying within the valence band are stimulated and pushed through the conduction band leaving behind a hole in the valence band (Zhang et al 2017 ). The main feature of these catalysts are non-toxicity and high stability (Di Palma et al 2019 ).…”

Recycling Strategy for Bioaqueous Phase via Catalytic Wet Air Oxidation to Biobased Acetic Acid Solution

“…17 Furthermore, we have noticed that the biobased industry also generates abundant aqueous byproducts, which sometimes are regarded as wastewater, during e.g., the pretreatment of biomass (e.g., acid leaching) 18 and post-treatment of "bio-oil" (e.g., fractionation of pyrolysis liquid by water extraction). 19 This wastewater needs to be treated before draining, and a few treatment technologies (e.g., adsorption, 20 photocatalytic ozonation, 21 electrochemical oxidation, 22 and biological treatment 23 ) have been investigated, though the degradation efficiency is rather low. Instead of treatment, valorizing the above aqueous streams (termed as bioaqueous phase in this contribution) to fuels and chemicals may offset the wastewater treatment cost and enhance the sustainability and profitability of the biobased industry.…”

Technologies for Water Reuse: Current Status and Future Challenges

“…Some papers are devoted to the analysis of state of the art and barriers (e.g., public acceptance) in the cited fields, also by carrying out meta-analysis [7,8] and by focusing on water quality [9,10]. A total of three published papers deal with innovative processes to remove organic micropollutant by means of biological treatment, adsorption or advanced oxidation processes [11][12][13]. Two papers focus on the removal of ions from water [10,14] with a particular focus on the energy recovery from wasted stream given in the final work of Capocelli et al [14].…”