Anaerobic treatment of p-acetamidobenzene sulfonyl chloride (p-ASC)-containing wastewater in the presence or absence of ethanol in a UASB reactor

Abstract

a b s t r a c tA lab-scale UASB reactor was operated for the treatment of p-acetamidobenzene sulfonyl chloride (p-ASC)-containing wastewater with and without ethanol for 210 days. The influence of the organic loading rate on the performance of reactor by step-decreasing HRT reduction/step-increasing the concentration of p-ASC was evaluated. Almost complete degradation of 50 mg/l p-ASC and COD removal efficiency (79.5%) was noticed with a COD removal of 79.5% at HRT of 0.5 day or longer and an applied p-ASC loading rate below 120 mg/l/day. No inhibition to the performance of this reactor was observed even at a p-ASC concentration up to 1000 mg/l. Of interest that despite the absence of sulfate in the feed, a certain quantity of sulfate and sulfide was simultaneously generated in the effluent. The trial result in the absence of ethanol demonstrated that p-ASC could be used as the sole source of carbon and energy. Clone libraries for the archaeal and bacterial communities were constructed for a biomass sample taken on day 190. The majority of bacterial clones were represented by Proteobacteria, followed by Thermotogae, Bacteroidetes and Firmicutes. Bacterial groups within the phyla Clostridia might be responsible for the desulfonation of p-ASC.

Improved anaerobic degradation of purified terephthalic acid wastewater by adding nanoparticles or co-substrates to facilitate the electron transfer process

“…pacetaminobenzene sulfonyl chloride) can be promoted by using ethanol as the cometabolism substrate. 14 The substrate maintained good degradation rates even when the addition of ethanol was ceased, therefore ethanol not only exhibited functionality towards cometabolism, but also possibly established the ethanol-induced excellent electron transfer process. All these exemplified reports potentially meaning that TA degradation performances may also possibly be accelerated via adopting the DIET strategy, nevertheless, adding ethanol into UASB reactors for TA wastewater degradation has not been previously reported.…”

Hythane (H2 + CH4) production from petrochemical wastewater containing mono-ethylene glycol via stepped anaerobic baffled reactor

“…It has several advantages such as; design simplicity, easy operation, low level of excess sludge, sufficient efficiency, useful by-products and low capital, operation and maintenance costs (Hassan and Dahlan, 2014). Moreover, various anaerobic technologies have been studied for the treatment of medium and high strength industrial effluents (Ghaniyari-Benis et al, 2010;Li et al, 2015). Recently, researchers concentrated on improving the production of bio-hydrogen/methane from the anaerobic digestion, especially due to the rising in energy demand and rapid exhaustion of non-renewable fossil fuel (Tawfik and Salem, 2014;Elsamadony et al, 2015b).…”