Removal performance and microbial communities in a sequencing batch reactor treating hypersaline phenol-laden wastewater

Simultaneous removal of sulfur and nitrogen compounds with methane production from concentrated latex wastewater in two bioreactor zones of micro‐oxygen hybrid reactor

“…The quantitative measurement of S 0 generated was not available in practice. Therefore conversion of S 0 was analyzed according to the method described by Jiang et al . TKN was measured by the macro‐Kjeldahl method, while nitrite‐nitrogen (NO 2 − ‐N) and nitrate‐nitrogen (NO 3 − ‐N) were measured through colorimetric and spectrophotometric methods respectively.…”

“…17 The quantitative measurement of S 0 generated was not available in practice. Therefore conversion of S 0 was analyzed according to the method described by Jiang et al 18 TKN was measured by the macro-Kjeldahl method, while nitrite-nitrogen (NO 2 − -N) and nitrate-nitrogen (NO 3 − -N) were measured through colorimetric and spectrophotometric methods respectively. N 2 was measured using a gas chromatograph equipped with a thermal conductivity detector (GC-14B, Shimadzu, Japan) and a molecular sieve packed column with helium as carrier gas at a flow rate of 25 mL min −1 .…”

Performance and microbial analysis during long‐term anaerobic digestion of olive mill wastewater in a packed‐bed biofilm reactor

“…However, in the biofilm sample, they were detected in lower percentages (21%, 30% and 11%, respectively) and Chloroflexi phyla was also identified and occupied about 17% of the total population. 41 The higher percentage of Proteobacteria in the liquid phase as compared to the biofilm probably suggests that the degradation of phenolic compounds mainly occurred in the liquid within the reactor. 11,40 Within the phylum of Firmicutes, the major classes detected in the liquid samples were Bacilli and Clostridia with average percentages of 2.3% and 26.2%, respectively.…”

“…As previously reported, Proteobacteria are gram-negative Bacteria that include many phenol degradation strains, their abundance in some phenol-degrading reactors revealed its important role in phenol degradation. 41 The higher percentage of Proteobacteria in the liquid phase as compared to the biofilm probably suggests that the degradation of phenolic compounds mainly occurred in the liquid within the reactor. Within the Archaeal domain, Euryarchaeota was the major phylum found in biofilm and liquid samples, accounting for more than 90% of the total population.…”

Effects of hydraulic retention time and proteins on sludge toxicity for 4‐chlorophenol wastewater treatment in sequencing batch reactors

“…However, a luminescent bacterium acute toxicity bioassay can be utilized to determine sludge toxicity for its sensitivity and accessibility (Zhao et al, ), and some other treatment processes can be used to reduce sludge toxicity, just as digestion, photocatalysis and ultrasonic (Anjum et al, ). Besides, in the process of wastewater treatment, the reactor performance is often significantly influenced by the changes of operation parameters as with dissolved oxygen (DO), hydraulic retention time (HRT), temperature and pH (Chen et al, ; Jiang et al, ; Xu et al, ). Jiang et al, () have investigated the optimal pH and DO for hypersaline phenol‐laden wastewater treatment in SBRs, and Chen et al () have found that changing HRT from 12 to 8 hours in SBRs is superior to remove bisphenol A and lower sludge toxicity while in the process of chlorophenols wastewater treatment, the influence of HRT on sludge toxicity is not found.…”