摘要
采用序批式反应器(Sequencing Batch Reactor,SBR)反应器,在(21±1)℃下,以NO3--N和NO2--N为电子受体,在碳源充足的条件下对反硝化过程中的pH变化规律进行了研究.结果表明,反硝化过程中pH曲线上不仅出现了指示反硝化结束的特征点,还出现了表示硝酸盐完全还原为亚硝酸盐的特征点.此外,在起始NOx--N(NO2--N+NO3--N)浓度与pH值相同的条件下,起始NO2--N浓度所占的比例越高,反硝化结束时pH曲线上峰点的值越高,在反硝化过程中产生的总碱度却相等.研究分析发现NO2--N所占比例不同,反硝化过程中产生的碱度类型就不同,这是造成pH增量不同的根本原因.这些研究结果为更好地控制污水处理工艺提供了参考数据.
Under sufficient organic carbon source, laboratory experiments were conducted to study pH profiles during denitrification with different nitrogen substances, i .e. nitrate and nitrite. SBR reactors were operated in denitrification mode at 21 ＋ 1 ℃ with the same configuration. With a fixed initial NOx^- （NO3^- ＋ NO2^- ） concentration, dynamics of pH were examined during denitrification at different proportion of nitrate and nitrite. Results showed that two break points were obeserved successively in pH profiles, which indicated the disappearance of nitrate and nitrite in system respectively. When computers are used to detect these features, they can provide rapid, real-time information, regarding the biological state of the system. Moreover, partial denitrification can get a higher pH value than complete denitrification at the end of denitrification. The larger proportion the nitrite takes, the higher pH peak can be achieved in pH profiles in despite of the same total alkalinity produced. It is found that different type of alkalinity was produced during biological denitrification with different nitrogen substances. It is possible to use pH as a monitoring and control parameters to achieve mere intelligent control in nitrogen removal processes.
出处
《高技术通讯》
CAS
CSCD
北大核心
2005年第8期91-95,共5页
Chinese High Technology Letters
基金
国家高技术研究发展计划(863计划)，国家自然科学基金，北京市重点实验室基金
