Enhanced dewaterability of sludge during anaerobic digestion with thermal hydrolysis pretreatment: New insights through structure evolution

Impact of rheological properties of substrate on anaerobic digestion and digestate dewaterability: New insights through rheological and physico-chemical interaction

“…Similarly, surface charge and hydrophobicity had a part to play in flocculation, settling, and dewatering (Shin et al, 2000). A linear relationship between elastic modulus and compactness of sludge (dewaterability) during AD was found by Zhang et al (2018) and poor dewaterability of highly viscous sludge . However, there is a lack of comprehensive research on the inherent interaction between degradability, physico-chemistry and rheology to further determine whether rheological parameters are able to describe the performance of anaerobic digesters (including both biogas yield and dewaterability).…”

Comparison between Thermo-Alkaline and Electro-Fenton Disintegration Effect on Waste Activated Sludge Anaerobic Digestion

“…In order to enhance biogas production and achieve faster degradation rate of WAS, various pretreatment techniques including chemical, mechanical, thermal, physical, and biological methods were largely studied [8]. In this context, over the last decade, researchers have proposed new ideas to intensify the WAS pretreatment by realizing intelligent combinations of established technologies, such as thermal-alkaline [9, 10], ultrasonic-Fenton [7, 11], electrochemical and sodium hypochlorite [12], and ozonation-microwave [13]. These processes have proven their effect on the acceleration of WAS hydrolysis and solubilisation of complex particulate matter by the disruption of sludge flocs, disintegration of bacteria cells and transfer of EPS and intracellular organic matters into the soluble fraction of the waste [8, 14].…”

Mechanistic Understanding of Beneficial Aspects of Iron Salts and Waterworks Sludge Uses in Urban Wastewater System

“…of sludge aggregates, has also been reported to influence the sludge dewaterability (Zhang et al, 2018;Zhao et al, 2013). This is because particle size and Df influence sludge porosity, density, and permeability (Zhao et al, 2013).…”

“…This is because particle size and Df influence sludge porosity, density, and permeability (Zhao et al, 2013). The higher the Df, the more compact is the sludge (Hermawan et al, 2004) and the stronger is sludge elasticity (Zhang et al, 2018). Sludge flocs characterized by a more compact structure (high Df value) may lead to the expansion of particle suspension surfaces, creating spatial structures.…”

“…In addition, sludge morphology (size/structure/compactness), also plays an important role in sludge dewaterability (Pham et al, 2010). Fractal dimension, Df, a parameter that is associated with sludge aggregate structure or reflects the degree of compactness, has also been reported to influence the sludge dewaterability (Zhang et al, 2018;Zhao et al, 2013). Both the particle size distribution (PSD)…”