Fazolo Ajadir, Foresti Eugenio, Zaiat Marcelo
Centro de Ciências Exatas e Tecnológicas, Universidade Estadual do Oeste do Paraná, Cascavel, PR, Brazil.
Appl Biochem Biotechnol. 2007 Jul;142(1):44-51. doi: 10.1007/s12010-007-0001-z.
This work reports on the removal of organic matter and nitrogen in a radial-flow aerobic-anoxic immobilized biomass (RAIB) reactor fed with domestic sewage pretreated in a horizontal-flow anaerobic immobilized biomass (HAIB) reactor. Polyurethane foam was used as support material for biomass attachment in both reactors. In batch experiments, a first-order kinetic model with residual concentration represented the organic matter removal rate, whereas nitrogen conversion followed a pseudo-first-order reaction in series model, with kinetic constants k1 (ammonium to nitrite) and k2 (nitrite to nitrate) of 0.25 and 6.62 h(-1), respectively. The RAIB reactor was operated in continuous-flow mode and changes in the airflow rate and hydraulic retention time were found to interfere in the apparent kinetic constants to the nitritation (k1) and nitratation (k2). Nitrification and denitrification were achieved in the partially aerated RAIB reactor operating with hydraulic retention times of 3.3 h and 2.7 h in the aerobic and anoxic zones, respectively. Ethanol was added in the anoxic zone of the reactor to promote denitrification. The effluent flow of the RAIB reactor presented a COD of 52 mg l(-1), and concentrations of 2 mg N - NH4(+)1(-1), 1.24 mg N - N02(-)1(-1) and 3.46 mg N - N03(-)1(-1).
本研究报告了在以水平流厌氧固定化生物量（HAIB）反应器预处理后的生活污水为进水的径向流好氧-缺氧固定化生物量（RAIB）反应器中去除有机物和氮的情况。在两个反应器中均使用聚氨酯泡沫作为生物量附着的载体材料。在批次实验中，以残留浓度表示的一级动力学模型代表有机物去除率，而氮转化遵循串联的伪一级反应模型，其中铵转化为亚硝酸盐的动力学常数k1和亚硝酸盐转化为硝酸盐的动力学常数k2分别为0.25 h⁻¹和6.62 h⁻¹。RAIB反应器以连续流模式运行，发现气流速率和水力停留时间的变化会干扰亚硝化（k1）和硝化（k2）的表观动力学常数。在部分曝气的RAIB反应器中实现了硝化和反硝化，该反应器在好氧区和缺氧区的水力停留时间分别为3.3 h和2.7 h。在反应器的缺氧区添加乙醇以促进反硝化。RAIB反应器的出水COD为52 mg L⁻¹，NH₄⁺-N浓度为2 mg L⁻¹，NO₂⁻-N浓度为1.24 mg L⁻¹，NO₃⁻-N浓度为3.46 mg L⁻¹。
