Peng D, Zhang X, Jin Q, Xiang L, Zhang D
Department of Environmental Engineering, Xi'an Inst. of Metallurgy and Construction, People's Republic of China.
J Chem Technol Biotechnol. 1994 Jun;60(2):171-6. doi: 10.1002/jctb.280600209.
A comparative study of different sludges (anaerobic sewage sludge and anaerobic sewage sludge cultivated for 30 days) as the seed of UASB reactors for treatment of synthetic resin production wastewater was carried out on a laboratory scale. Significant differences in reactor performance were observed. With anaerobic sewage sludge seed, the reactor obtained a 71% COD removal efficiency and produced 2.94 dm3 biogas per dm3 wastewater under an organic loading rate of 4.5 kg COD m-3 day-1. The sludge in the reactor was diffuse and possessed poor settling ability, which led to effluent SS as high as 1200 mg dm-3. However, with anaerobic sewage sludge cultivated with synthetic substrate for 30 days as a seed, the same reactor gave 78% COD removal efficiency and produced 3.5 dm-3 biogas per dm3 wastewater at the same loading rate. Moreover, the sludge in the reactor was completely granulated and possessed good settling ability, which resulted in effluent SS as low as 200 mg dm-3. The granular sludge produced less biomass per gram COD removed than the diffused sludge. Anaerobic sewage sludge cultivated for a short time could form the nuclei of granules for the reactor, allowing granulation to proceed smoothly. Therefore, sludge nuclei are a prerequisite of sludge granulation in UASB reactors for treatment of toxic wastewater.
在实验室规模下，对不同污泥（厌氧污水污泥和培养30天的厌氧污水污泥）作为上流式厌氧污泥床（UASB）反应器处理合成树脂生产废水的接种物进行了比较研究。观察到反应器性能存在显著差异。以厌氧污水污泥为接种物时，在有机负荷率为4.5 kg COD m-3 day-1的条件下，反应器的化学需氧量（COD）去除效率达到71%，每立方分米废水产生2.94立方分米沼气。反应器中的污泥呈分散状，沉降性能较差，导致出水悬浮物（SS）高达1200 mg dm-3。然而，以用合成底物培养30天的厌氧污水污泥为接种物时，同一反应器在相同负荷率下的COD去除效率为78%，每立方分米废水产生3.5立方分米沼气。此外，反应器中的污泥完全颗粒化，沉降性能良好，使得出水SS低至200 mg dm-3。每克COD去除量产生的颗粒污泥生物质比分散污泥少。短期培养的厌氧污水污泥可为反应器形成颗粒核心，使颗粒化顺利进行。因此，污泥核心是UASB反应器处理有毒废水时污泥颗粒化的前提条件。
