Sahariah Biju Prava, Anandkumar J, Chakraborty Saswati
a Department of Energy and Environmental Engineering , Chhattisgarh Swami Vivekanand Technical University , Chhattisgarh , India.
b Department of Chemical Engineering , National Institute of Technology Raipur , Chhattisgarh , India.
Environ Technol. 2018 Jul;39(14):1786-1794. doi: 10.1080/09593330.2017.1340344. Epub 2017 Jun 26.
A synthetic wastewater containing various pyridine concentrations (25-250 mg/L) was treated in a sequential anaerobic(B1)-anoxic(B2)-aerobic(B3) fed batch moving bed reactor (FMBR) system. Pyridine was associated with phenol (1500 mg/L), SCN- (800 mg/L), chemical oxygen demand (COD) (5400-5430 mg/L) and NH4+-N (500 mg/L) at hydraulic retention time (HRT) of 6 (B1: 3 days; B2 and B3: 1.5 days each) days. In B1, pyridine removal was 10-12% from influent concentration of 25-100 mg/L and beyond that, it was zero. Removal of phenol (53-39%) and COD (33-22%) occurred in B1, but pyridine above 50 mg/L inhibited both. In B2, 68-90% of pyridine removal occurred along with phenol (>98%), COD (>67%), SCN- (>85%) removal and denitrification. In B2, with an increase in pyridine loading removal rate of phenol, COD and nitrate increased, whereas SCN- removal decreased beyond pyridine loading of 0.031g/L day. In B3, nitrification decreased with high generation of free ammonia. Pyridine degradation in B1, B2 and B3 follows the Stover-Kincannon model with a maximum substrate removal rate of 111.1, 333.3 and 23.81 g/L day, respectively. Thiocyanate removal in B2 and ammonia removal in B3 follows the Bhatia inhibition model with a maximum substrate removal rate of 0.641 and 0.528/day, respectively. The overall efficiency of the FMBR system remained unaffected up to 250 mg pyridine/L at 6 days HRT.
在一个序批式厌氧（B1）-缺氧（B2）-好氧（B3）进水间歇移动床反应器（FMBR）系统中处理了含有不同吡啶浓度（25 - 250 mg/L）的合成废水。吡啶与苯酚（1500 mg/L）、SCN⁻（800 mg/L）、化学需氧量（COD）（5400 - 5430 mg/L）和NH₄⁺-N（500 mg/L）共存，水力停留时间（HRT）为6天（B1：3天；B2和B3各1.5天）。在B1中，进水吡啶浓度为25 - 100 mg/L时，吡啶去除率为10 - 12%，超过该浓度则为零。B1中发生了苯酚（53 - 39%）和COD（33 - 22%）的去除，但50 mg/L以上的吡啶对两者均有抑制作用。在B2中，68 - 90%的吡啶去除伴随着苯酚（>98%）、COD（>67%）、SCN⁻（>85%）的去除和反硝化作用。在B2中，随着吡啶负荷的增加，苯酚、COD和硝酸盐的去除率增加，而当吡啶负荷超过0.031 g/L·天，SCN⁻的去除率下降。在B3中，随着游离氨的大量产生硝化作用下降。B1、B2和B3中吡啶降解遵循Stover - Kincannon模型，最大底物去除率分别为111.1、333.3和23.81 g/L·天。B2中硫氰酸盐的去除和B3中氨的去除遵循Bhatia抑制模型，最大底物去除率分别为0.641和0.528/天。在HRT为6天的情况下，FMBR系统中吡啶浓度高达250 mg/L时，整体效率不受影响。
