Lub biotransformation ntawm ammonia nitrogen (ammoniation, nitrification, denitrification, thiab lwm yam) yog rhiab heev rau pH. Cov kab mob sib txawv muaj lawv cov pH zoo tshaj plaws:
1. Nitrification (Ammonium ions → Nitrite → Nitrate)
Qhov zoo tshaj pH: 7.5-8.5 (Nitrifying kab mob 7.0-8.5, Nitrifying kab mob 7.5-8.8)
pH <6.5: Nitrifying cov kab mob kev ua haujlwm yog inhibited heev, ammonia nitrogen hloov pauv poob qis, lossis txawm tias nres.
pH > 9.0: Ntau heev dawb ammonia concentration inhibits nitrifying kab mob, thiab alkalinity siab heev nce nqi kho mob.
Yam ntxwv: Nitrification siv alkalinity (ua hydrogen ions), ua rau txo qis pH. Lub sij hawm ntxiv ntawm alkalinity yog qhov tsim nyog los tswj qhov system stability.
2. Denitrification (Nitrate → Nitrogen)
Qhov zoo tshaj pH: 6.5-7.5
pH <6.0: Tus nqi denitrification yog txo qis, thiab nitrite tuaj yeem sib sau.
pH > 8.0: Denitrification efficiency txo, thiab lub tsev cog khoom gases xws li nitrous oxide yuav raug tsim.
3. Cov txheej txheem tshem tawm Biological Nitrogen
Pom zoo pH: Khaws ntawm 7.0-8.5 thoob plaws hauv cov txheej txheem, nrog rau theem nitrification khaws cia ntawm 7.5-8.5 thiab theem denitrification ntawm 6.5-7.5.