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Enrichment of high activity nitrifers to enhance partial nitrification process
- Chen, Jianwei, Zheng, Ping, Yu, Yi, Mahmood, Qaisar, Tang, Chongjian
- Bioresource technology 2010 v.101 no.19 pp. 7293-7298
- ammonia, inoculum, nitrification, nitrogen
- Partial nitrification (PN) process is an essential pre-treatment to Anammox process for nitrogen removal from ammonium-rich wastewaters. High activity nitrifiers (HANs) are considered as the key to high-rate PN process. The HANs could be successfully enriched at free ammonia (FA) concentrations of 10-20mgNH₃-NL⁻¹, which differed significantly from those enriched at FA concentrations of 1-3mgNH₃-NL⁻¹. The maximum specific ammonium conversion rate, half saturation constant, half inhibition constant, cell yield and decay rate were 2.87gNg⁻¹ VSSd⁻¹, 5.82mgNL⁻¹, 8218.8mgNL⁻¹, 0.15gVSSg⁻¹ [formula removed]-N and 0.09d⁻¹ for HANs at 30°C, respectively, which endowed the PN process a volumetric conversion rate (VCR) as high as 2.22±0.33kgNm⁻³ d⁻¹. The cultivation mode of HANs was workable and the HANs were promising as inoculum for the PN process.