Yu You Li

TL;DR: In this article, an up-to-date review of recent research achievements in the pretreatment technologies used for improving biogas production including mechanical (ultrasonic, microwave, electrokinetic and high-pressure homogenization), thermal, chemical (acidic, alkali, ozonation, Fenton and Fe(II)-activated persulfate oxidation), and biological options (temperature-phased anaerobic digestion and microbial electrolysis cell).

TL;DR: In this paper, the effect of thermal pretreatment on the characteristics of degradation of waste activated slduge (WAS) in anaerobic digestion was investigated by laboratory-scale batch and continuous experiments at 35±1°C.

TL;DR: In this paper, the effects of pH and moisture content on high-solids sludge digestion were investigated using a mesophilic batch digester fed with sludge cake, and the experiments were carried out by changing the initial moisture contents from 90 to 96% and the initial pH from 5.6-7.8 with an optimum of pH 6.3.

TL;DR: A pH-phased two-stage fermentation process combined thermophilic hydrogen production and mesophilic methane production with recirculation of the digested sludge was suggested in this paper.

TL;DR: Results suggest that long-term stability of the continuous two-stage process can be successfully achieved by recirculation of high-alkalinity sludge of 6.7-7.5 g l(-1) as CaCO(3), without any added external chemical buffer.