Ghangrekar M M, Asolekar S R, Joshi S G
Department of Civil Engineering, Indian Institute of Technology, Kharagpur-721 302, India.
Water Res. 2005 Mar;39(6):1123-33. doi: 10.1016/j.watres.2004.12.018.
Sludge characteristics available inside the reactor are of vital importance to maximize advantages of UASB reactor. The organic loading rate and sludge loading rate applied during start-up are among the important parameters to govern the sludge characteristics. Effects of these loading rates on the characteristics of the sludge developed are evaluated in six laboratory scale UASB reactors. The sludge characteristics considered are VSS/SS ratio of the sludge, sludge volume index, specific gravity, settling velocity and metal contents of the sludge developed under different loading rates. The experimental results indicate that, for developing good characteristics sludge, during primary start-up from flocculent inoculum sludge, organic loading rate and sludge loading rate should be in the range of 2.0-4.5 kg COD/m3 d and 0.1-0.25 kg COD/kg VSS d, respectively (chemical oxygen demand, COD). Proper sludge granulation and higher COD removal efficiency will be achieved by these loading rates.
反应器内的污泥特性对于最大化UASB反应器的优势至关重要。启动期间应用的有机负荷率和污泥负荷率是控制污泥特性的重要参数。在六个实验室规模的UASB反应器中评估了这些负荷率对所形成污泥特性的影响。所考虑的污泥特性包括不同负荷率下形成的污泥的VSS/SS比、污泥体积指数、比重、沉降速度和金属含量。实验结果表明，为了培养出特性良好的污泥，从絮凝接种污泥进行初次启动时，有机负荷率和污泥负荷率应分别在2.0-4.5 kg COD/m³·d和0.1-0.25 kg COD/kg VSS·d的范围内（化学需氧量，COD）。通过这些负荷率将实现适当的污泥颗粒化和更高的COD去除效率。
