Effect of Acetic Acid on Denitrification and Dephosphatation Process Efficiencies in Sequencing Batch Biofilm Reactor

Abstract

This study investigates the feasibility of using an organic substrate in the form of acetic acid to enable wastewater denitrification in a Sequencing Batch Biofilm Reactor (SBBR). The impact of nitrates presence on the yield of biological dephosphatation was determined as well. The experiment included 296 cycles and was divided into 4 series differing in the load of nitrates. The N:(C and P) ratios were: 7:(140 and 7); 35:(140 and 7); 70:(140 and 7) and 140:(140 and 7). The hydraulic retention time in the reactor was 12h (6h of mixing-dissolved oxygen concentration below 0.1 and 6h of aeration-concentration of dissolved oxygen 3.0±0.8 mgO 2 •dm-3). The study demonstrated that the 30-day adaptation period (60 cycles) was sufficient for the development of a stable biofilm. The C:N ratio of 2 ensured the total nitrogen concentration in the effluent below 1 mgN•dm-3. The mean efficiency of biological dephosphatation reached 7.0, 17.4, 18.7, and 30.3% in series 1-4, respectively. In the case of series 2 and 3, no significant differences were demonstrated in the total phosphorus concentration in the effluent. In the other series, the differences turned out to be significant.

A systematic literature review of biocarriers: Central elements for biofilm formation, organic and nutrients removal in sequencing batch biofilm reactor

“…It also conducts wastewater stirring and periodical aeration, discharges the entire amount of wastewater and enables the sloughing of surplus biomass. The disks submersion rate is to 100 % [32,70].…”

“…When a steel disk was used in SBBR system, the improved performance in the absorption of organic substrate leads to a high denitrification efficiency [70]. The thickness of the biofilm varies from 1-20 μm and allowed the organic substrate to be ingested effectively.…”

“…Despite portraying clear stratification, the film color varied from milk-like to dark brown. Bacteria of the biofilm in the submerged disk [70],…”

Bioaugmented Mixed Culture by Clostridium aceticum to Manipulate Volatile Fatty Acids Composition From the Fermentation of Cheese Production Wastewater

“…Nevertheless, more than 90% of acetic acid is produced synthetically (Atasoy et al, 2018). In several wastewater treatment plants, acetic acid has been used as a carbon source in the denitrification process (Mielcarek et al, 2018;Du et al, 2019). However, this acetic acid is mostly bought externally, which is obtained by petroleum-based methods.…”

Effectiveness of Sequencing Batch Biofilm Reactor Technology to Treat Domestic Wastewater in Basrah City

“…SBBR has a much higher pollutant removal performance than a traditional SBR [Singh and Srivastava, 2011]. Moreover, the possibility to enable wastewater denitrification in a (SBBR) by using an organic substrate in the form of acetic were investigated in addition to studying the characteristics of the sludge formed via SVBBR [Mielcarek et al, 2018, Kłodowska et al, 2018.…”