Study of the Effect of Various Factors on the Nitrosification to Tannery Wastewater
Tannery wastewater has a high level of contamination of ammonia nitrogen. The conventional method to remove ammonia nitrogen is the entire nitrification. While this experiment used the nitrosification, which had some merits, such as reducing the amount of alkali, decreasing the supply of oxygen and saving carbons. In this paper, removal of the ammonia nitrogen in tannery wastewater by the method of nitrosification was investigated. Some influence factors such as temperature, pH, dissolved oxygen (DO), aeration way and C/N on the nitrosification to the tannery wastewater were studied in a sequencing batch reactor (SBR). The processes showed that the nitrosification to the tannery wastewater could be achieved by intermittent aeration. The results indicated that the nitrosification had better effects comparatively when the temperature was 31±1℃ and the pH was 7.8-8.2. In addition, it was needed to choose a proper C/N and put the NaOH-NaHCO_3 buffer solution into the system to keep the pH in the cycle relatively stable. The results also demonstrated that the concentration of ammonia nitrogen in the effluents was about 20mg/L after the nitrosification process, reaching the national emission standards for secondary effluent and the removal rate of ammonia nitrogen was about 89％, which showed that the nitrosification process was effective for tannery wastewater to remove ammonia nitrogen.
tannery wastewater the nitrosification ammonia nitrogen
Yijuan Li Yanchun Li Rong Xue
School of Light Chemistry and Environmental Engineering, Shandong Institute of Light Industry, Jinan 250353, Shandong, P.R.China
国际会议
北京
英文
265-272
2009-10-11（万方平台首次上网日期，不代表论文的发表时间）