Abstract:Polyhydroxyalkanoates (PHAs) pellets, which were taken from a denitrification biofilter with sustained-release carbon source materials, were used to investigate the effects of microbes and nitrate on the organic carbon release rate of PHAs and the effects of temperature, pH and NO3--N concentration on the denitrification rates. The results indicated that the total organic carbon (TOC) release rates of original PHAs and those with biofilm attached were determined to be 0.030 and 0.053mg/(g·d) in the deionized water, respectively, which were much lower than that of 0.533mg/(g·d) in simultaneous presence of microbes and nitrate (30mg/L of NO3--N concentration). The effects of temperature and pH on denitrification rates were significant. When influent NO3--N concentration was 50mg/L, the maximum denitrification rates achieved to 0.067mg/(g·h) at 30℃ in the temperature range of 15 to 35℃, and to 0.061mg/(g·h) at pH7.8 in the pH range of 6.0 to 9.0. The relationship between denitrification rates and NO3--N concentrations appeared to be in good agreement with Monod Equation, and the maximum denitrification rate and the saturation constant were 4.74mgNO3--N/(gSS·h) and 56.6mg/L, respectively.
李彭, 唐蕾, 左剑恶, 袁琳, 李再兴. 以PHAs为固体碳源的城镇二级出水深度脱氮研究[J]. 中国环境科学, 2014, 34(2): 331-336.
LI Peng, TANG Lei, ZUO Jian-E, YUAN Lin, LI Zai-Xing. Tertiary nitrogen removal of the municipal secondary effluent using PHAs as solid carbon sources. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(2): 331-336.