Nutrient removal and phosphorus recovery performances of a novel anaerobic-anoxic/nitrifying/induced crystallization process

Characterization of Denitrifying Phosphorus Removal Microorganisms in a Novel Two-Sludge Process by Combining Chemical with Microbial Analysis

“…During the operation of the two-sludge process proposed here, the characteristics of feed were as follows: the COD concentration range of 152∼237 mg/L, NH 4 + -N of 23.4∼ 49.8 mg/L, TN of 31.3∼50.5 mg/L, and TP of 3.92∼7.68 mg/L. Correspondingly, the characteristics of final effluent were COD of 10.3∼16.1 mg/L, TN of 9.0∼14.5 mg/L, and TP of 0.17∼ 0.33 mg/L throughout the whole running period, meeting the A in first grade of Chinese sewage effluent discharge standard (GB 18918-2002), as shown in our previous studies [14].…”

“…And then, a higher amount of P, in excess of normal metabolic requirements of DPB, is taken up when nitrate is supplied instead of oxygen, which is combined with the growth of biomass and the regeneration of glycogen. Moreover, parts of phosphorus in wastewater can be recovered by means of induced crystallization, which is significantly advantageous to conventional phosphorus removal process, as evidenced in our previous study [14]. Activated sludge samples for chemical and microbial analyze were taken from the anoxic tank proposed in this study.…”

Metabolic shift of polyphosphate-accumulating organisms with different levels of polyphosphate storage

“…One of the bottlenecks of this technology is that the phosphate concentration achieved in the stripper stream is not high enough to assure a high P recovery efficiency in a later crystallization process (around 25 mgP l -1 in the anaerobic phase, see Barat and van Loosdrecht, 2006). Other studies, recently published, studied the feasibility of the P recovery as P enriched stream in the water line using different configurations (Kodera et al, 2013;Shi et al, 2012;Wong et al, 2013;Xia et al, 2014).…”

Influence of organic shock loads on the production of N2O in denitrifying phosphorus removal process

“…Similar results were also reported by Wang et al (2009) who found that the P removal efficiency decreased from 97% to 62% by decreasing the influent COD concentration in A 2 N-SBR system. The main reason was that the low influent COD concentration decreased the amount of PHA synthesis which used for phosphorous uptake during anoxic period (Wang et al, 2009;Shi et al, 2012). In order to further explain the effects of organic shock loads on TN and P removal efficiencies.…”