Characterizing the free ammonia exposure to the nutrients removal in activated sludge systems

Abstract

As a by-product during liquid production, the liquor wastewater exhibits tremendous environmental risks and may cause undesirable effects to the biological systems due to the high concentration of ammonia.

Physicochemical and Biological Effects on Activated Sludge Performance and Activity Recovery of Damaged Sludge by Exposure to CeO2 Nanoparticles in Sequencing Batch Reactors

“…For statistical analysis, the experimental values were compared to their corresponding control values. An analysis of variance (ANOVA) was used to test the significance of the results, and p < 0.05 was considered to be statistically significant, as similarly described by Cao et al [25].…”

Conductive materials stimulated direct interspecies electron transfer and application in anaerobic digestion

“…were positively correlated to ammonia concentration, while none statistical correlation was observed for HMW polysaccharides and LMW acids (p > 0.05) (Table 7.6). The positive correlation of HMW protein with ammonia concentration was consistent with previous study that bacterial detoxicate activity can enhance protein or enzyme secretion (Cao et al 2017, Zheng et al 2013.…”

Influent carbon to phosphorus ratio drives the selection of PHA-storing organisms in a single CSTR

“…When applicable: mean values ± standard deviations (number of measurements). Concerning the high NH 4 + -N concentrations in the influent, estimates of NH 3 -N bulk concentrations (always < 5mgN L −1 ) from NH 4 + -N measurements suggest NH 3 -N concentrations were not inhibiting heterotrophic growth ( Cao et al., 2017 ). CSTRs C-substrate, N and P dosage Reactor influent measurements Operating conditions Acetate Propionate N-species P-species NaC 2 H 3 O 2 NaC 3 H 5 O 2 NH 4 Cl KH 2 PO 4 K 2 HPO 4 COD:P sCOD SRT = HRT Duration [g L influent −1 ] [g L influent −1 ] [g L influent −1 ] [g L influent −1 ] [g L influent −1 ] [gCOD gP −1 ] [gCOD L −1 ] [d] [d] COD:P 200 5.86 3.69 1.53 0.088 0.113 188 ± 7 (11) 8.4 ± 1.2 (11) 1.0 ± 0.1 (11) 30 COD:P 400 5.86 3.69 1.53 0.044 0.056 391 ± 15 (23) 8.1 ± 0.4 (23) 1.0 ± 0.0 (23) 57 COD:P 600 5.86 3.69 1.53 0.030 0.038 593 ± 20 (23) 8.5 ± 0.7 (23) 1.0 ± 0.1 (23) 57 COD:P 800 5.86 …”