进水碳氮比对缺氧/好氧SBR亚硝化系统的影响

为研究不同进水碳氮比对缺氧/好氧SBR亚硝化系统的影响,在室温下（18～20 ℃）,调节进水的碳氮比为0,2/3,1,4/3,2,3,6,对反应器的运行情况进行研究.结果表明:在进水COD和氨氮负荷分别为0.2,0.3 kg/(m3·d)时,仅历经24 d就成功获得了亚硝化絮状污泥,比进水无COD的污泥系统能较快启动亚硝化工艺.在碳氮比小于6时,污泥系统均能保持良好的亚硝化性能,亚硝化率大于90%；碳氮比为6时,亚硝化率下降至70%.进水碳氮比为4/3时,异养菌充分利用进水COD进行脱氮,总氮的去除率达到49.8%,且COD的去除率保持在80%以上；进水碳氮比小于4/3时,污泥系统缺乏碳源,总氮去除率随着碳氮比的增加而增加；当碳氮比为4/3～2时,COD和总氮去除率几乎没有变化；当碳氮比为2～6时,由于进水氨氮负荷的降低,COD和总氮的去除率呈下降趋势,运行末期（154 d）,COD和总氮的去除率分别为64.8%,18%.由COD的增加而引起碳氮比的增加时,蛋白质（PN）呈逐渐增加的趋势,多糖（PS）几乎不变,而由氨氮的减少引起碳氮比的增加,PN和PS均下降,但PN与PS比呈上升趋势.
In order to assess the impact of different carbon/nitrogen (C/N) on anoxic/aerobic sequencing batch reactor (SBR) nitrosation system, the C/N was adjusted to 0,2/3,1, 4/3,2, 3,6 at room temperature (18-20 ℃). The results showed that the activated sludge system with the influent chemical oxygen demand (COD) loading and ammonia loading of 0.2 and 0.3 kg/(m3·d) successfully achieved nitritation only after 24 d. It needed more time to achieve nitritation with no COD in influent. When the C/N was less than 6, the system maintained good nitritation performance with the nitrosation rate of over 90%. When the C/N was 6, the nitrosation rate dropped to 70%. When the C/N was 4/3, the heterotrophic bacteria used the influent COD for denitrification adequately, the total nitrogen removal efficiency reached 49.8%, and the COD removal efficiency remained above 80%. Because the sludge system lacked the carbon source, the total nitrogen removal efficiency increased with the increase of the C/N when it was less than 4/3. When the C/N was 4/3 to 2, the COD and total nitrogen removal efficiencies almost remained unchanged. When the C/N was 2 to 6, due to the reduction of influent ammonia loading, the removal efficiencies of COD and total nitrogen showed a downward trend. At the end of operation (154 d), COD and total nitrogen removal efficiencies were 64.8% and 18%, respectively. When the C/N increased due to an increase in COD, the proteins (PN) tended to increase gradually, and polysaccharides (PS) almost did not change, while the decrease in ammonia caused an increase in the C/N, PN and PS decreased, but the value of PN/PS increased.