de heyder B, van Elst T, van Langenhove H, Verstraete W
Department of Organic Chemistry, University of Gent, Belgium.
Biodegradation. 1997;8(1):21-30. doi: 10.1023/a:1008204803231.
The treatment of poorly water soluble waste gas compounds, such as ethene, is associated with low substrate concentration levels in the liquid phase. This low concentration level might hamper the optimal development of a microbial population. In this respect, the possible benefit of introducing nitrifying activity in the heterotrophic removal of ethene at moderate concentrations (< 1000 ppm) from a waste gas was investigated. Nitrifying activity is known to be associated with (i) the production of soluble microbial products, which can act as (co-)substrates for heterotrophic micro-organisms and (ii) the co-oxidation of ethene. The used reactor configuration was a packed granular activated carbon biobed inoculated with the heterotrophic strain Mycobacterium E3. The nitrifying activity was introduced by regular submersion in a nitrifying medium prepared from (i) compost or (ii) activated sludge. In both cases a clear enhancement of the volumetric removal rate of ethene could be observed. When combined with a NH3 dosage on a daily basis, a gradual increase of the volumetric removal rate of ethene could be observed. For a volumetric loading rate of 3 kg ethene-COD.m-3.d-1, the volumetric removal rate could thus be increased with a factor 1.8, i.e. from 0.72 to a level of 1.26 kg ethene-COD.m-3.d-1.
对于水溶性差的废气化合物（如乙烯）的处理，液相中的底物浓度水平较低。这种低浓度水平可能会阻碍微生物种群的最佳生长。在这方面，研究了在从废气中以中等浓度（<1000 ppm）异养去除乙烯的过程中引入硝化活性可能带来的益处。已知硝化活性与以下方面有关：（i）可溶性微生物产物的产生，其可作为异养微生物的（共）底物；（ii）乙烯的共氧化。所使用的反应器配置是填充有颗粒活性炭的生物床，接种了异养菌株分枝杆菌E3。通过定期浸没在由（i）堆肥或（ii）活性污泥制备的硝化培养基中来引入硝化活性。在这两种情况下，都可以观察到乙烯体积去除率的明显提高。当每天添加氨时，可以观察到乙烯体积去除率逐渐增加。对于3 kg乙烯-COD·m-3·d-1的体积负荷率，乙烯体积去除率因此可以提高1.8倍，即从0.72提高到1.26 kg乙烯-COD·m-3·d-1的水平。
