含海水污水的短程硝化反硝化

采用SBR工艺通过控制游离氨(FA)浓度实现了含海水生活污水的短程硝化反硝化脱氮,并研究了不同海水盐度情况下,温度、pH值、NH₄⁺-N负荷等诸因素对短程硝化反硝化的影响.试验结果表明:大生活用水范围内的海水盐度情况下仍可实现短程硝化反硝化,但不同海水盐度情况下的NH₄⁺-N去除率与NHH₄⁺-N负荷有关,随着海水占生活污水比例的增加NH₄⁺-N负荷应逐渐减少.当NH₄⁺-N负荷小于0.15kg/(kg·d)时,短程硝化的NH₄⁺-N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,当温度从20℃升高到30℃时,亚硝化比增长速率增加1倍.反应温度应保持在25℃～30℃,pH值的最佳范围为7.5～8.5.较高的进水pH值有利于通过游离氨浓度控制亚硝酸型硝化的形成.

Nitrogen Removal from the Sewage Containing Seawater via Nitrite Pathway

With control of the concentration of free ammonia (FA), shortened nitrification-denitrification was accomplished in SBR to achieve enhanced nitrogen removal from the sewage containing seawater. Several parameters which included salinity, temperature, pH and NH4(+)-N load were studied to evaluate their effects. The results of experiences indicated that shortened nitrification-denitrification can be accomplished in sewage containing seawater with relatively high salinity. With various salinity, the nitrogen removal efficiency had relationship with the NH4(+)-N load, there should be a lower NH4(+)-N load when the salinity was high. The nitrogen removal efficiency reached above 90% when the NH4(+)-N load was not exceed 0.15 kg/(kg.d). Elevation of the temperature availed to higher nitrogen removal efficiency, this efficiency doubled when the reaction temperature was changed from 20 degrees C to 30 degrees C. Relatively high value of pH, in the range of 7.5 and 8.5 had advantage to achieve effective shortened nitrification-denitrification which caused by the selective inhibition of free ammonia(FA).