Kub
Kub Kub (30-40 degree): AOB kev loj hlob tus nqi siab dua NOB (xws li, SHARON txheej txheem siv 35℃los inhibit NOB). Tsawg kub (<15℃): NOB activity decreases significantly, but AOB can still maintain some activity.
Dissolved Oxygen (DO)
Tsawg DO Strategy: DO yog tswj ntawm 0.5–1.0 mg / L kom txwv NOB txoj kev siv oxygen thiab txhawb AOB dominance.
pH thiab Cov Tshuaj Dawb
Kev cai pH: Siab pH (7.5–8.5): Ua kom FA concentration (NH₃), inhibiting NOB. Tsawg pH (6.0–6.5): Nce FNA (HNO₂), inhibiting NOB. Synergistic nyhuv ntawm FA thiab FNA: Tswj FA / FNA toxicity pib los ntawm kev kho NH₄⁺ concentration thiab pH.
Sludge Retention Time (SRT)
Luv SRT (<5 days): NOB growth rate is slower than AOB, and it is easily washed out of the system (e.g., the SHARON process). Long SRT: May lead to NOB resurgence, disrupting short-cut nitrification.
Substrate Concentration thiab Loading
High ammonia nitrogen loading: Ua kom FA concentration, txhim kho NOB inhibition. Cov pa roj carbon-rau-nitrogen piv (C/N): Tsawg C / N cov dej khib nyiab (xws li, digestate) zoo dua rau luv luv- txiav nitrification, zam kev sib tw los ntawm cov kab mob heterotrophic.
Inhibitors thiab Txheej Txheem Tswj
Tshuaj inhibitors: Xws li hydroxylamine (NH₂OH) thiab cov hlau hnyav (Cu²⁺) tuaj yeem xaiv inhibit NOB. Intermittent aeration: Inhibits NOB kev ua los ntawm alternating aerobic/anoxic tej yam kev mob (xws li, SBR txheej txheem).
