海水盐度对短程硝化反硝化的影响

Effect of the seawater salinity on the nitrification-denitrification via nitrite pathway

采用SBR工艺研究了海水盐度对短程硝化反硝化影响,同时研究了不同海水盐度下,温度、pH、氨氮负荷对氨氮去除率的影响。试验结果表明:大生活用水范围内(海水占生活用水的比例在35%以内)的海水盐度情况下仍能实现短程硝化反硝化,但不同海水盐度情况下的氨氮去除率与氨氮负荷有关,随着海水占生活污水比例的增加氨氮负荷应逐渐减少。当短程硝化系统的单位MLSS氨氮负荷小于0.15kg/(kg·d)时,氨氮去除率仍可达到90%以上。升高温度有利于提高短程硝化脱氮效率,反应温度应保持在25～30℃。

Effects of seawater salinity on the nitrificationdenitrification via nitrite pathway are studied by SBR process. Several parameters of temperature,pH and NH4+-N load are also studied to evaluate their effects on nitrogen removal efficiency under different salinity. The experimental results indicate that nitrificationdenitrification via nitrite pathway can be accomplished still in the salinity range of domestic sewage(the proportion of seawater in sewage is not large than 35%),but the nitrogen removal efficiency has relations with the NH4+-N load having different salinity. To maintain the nitrification via nitrite and a relatively high ammonia nitrogen removal efficiency, the NH4+-N load should be reduced with the increasing of the proportion of seawater in domestic sewage. The nitrogen removal efficiency reaches over 90% when the NH4+-N load is lower than reaction temperature should be kept at 25 ℃ to 30 ℃.