Department of Chemical Engineering, Vaal University of Technology, Private Bag X021, Vanderbijlpark 1900, South Africa.
J Hazard Mater. 2013 Oct 15;261:435-42. doi: 10.1016/j.jhazmat.2013.06.058. Epub 2013 Jul 1.
Anaerobic up-flow fixed bed reactor and annular photocatalytic reactor were used to study the efficiency of integrated anaerobic digestion (AD) and ultraviolet (UV) photodegradation of real distillery effluent and raw molasses wastewater (MWW). It was found that UV photodegradation as a stand-alone technique achieved colour removal of 54% and 69% for the distillery and MWW, respectively, with a COD reduction of <20% and a negligible BOD reduction. On the other hand, AD as a single treatment technique was found to be effective in COD and BOD reduction with efficiencies of above 75% and 85%, respectively, for both wastewater samples. However, the AD achieved low colour removal efficiency, with an increase in colour intensity of 13% recorded when treating MWW while a colour removal of 51% was achieved for the distillery effluent. The application of UV photodegradation as a pre-treatment method to the AD process reduced the COD removal and biogas production efficiency. However, an integration in which UV photodegradation was employed as a post-treatment to the AD process achieved high COD removal of above 85% for both wastewater samples, and colour removal of 88% for the distillery effluent. Thus, photodegradation can be employed as a post-treatment technique to an AD system treating distillery effluent for complete removal of the biorecalcitrant and colour imparting compounds.
采用厌氧上流固定床反应器和环形光催化反应器，研究了集成厌氧消化（AD）和紫外线（UV）光降解实际酿酒厂废水和原糖蜜废水（MWW）的效率。结果发现，UV 光降解作为一种独立技术，分别对酿酒厂和 MWW 的色度去除率达到 54%和 69%，COD 降低<20%，BOD 降低可忽略不计。另一方面，AD 作为单一处理技术，对两种废水样品的 COD 和 BOD 去除率均达到 75%以上和 85%以上，但 AD 对色度的去除效率较低，处理 MWW 时色度强度增加 13%，而对酿酒厂废水的色度去除率达到 51%。将 UV 光降解作为 AD 工艺的预处理方法应用会降低 COD 去除和沼气产生效率。然而，将 UV 光降解作为 AD 工艺的后处理方法进行集成，可以实现对两种废水样品的高 COD 去除率（均>85%），以及对酿酒厂废水的 88%的色度去除率。因此，光降解可以作为 AD 系统的后处理技术，用于完全去除生物难降解和显色化合物。
