Doctor Liu is a professor and doctoral supervisor at Jiangnan University. His research areas mainly cover the resource-based treatment and disposal of solid waste, biological nitrogen and phosphorus removal from sewage, and membrane-based water treatment. He uses anaerobic microorganisms to convert organic matter in solid waste such as municipal sludge into high-value-added volatile short-chain fatty acids (VFAs), which reduces the emission of greenhouse gases like methane and achieves carbon neutrality. Moreover, these VFAs are applied as an external carbon source for nitrogen and phosphorus removal in sewage, facilitating the upgrading and transformation of sewage treatment plants. He participated in the design and establishment of the first domestic project for anaerobic fermentation of municipal sludge to produce acids and resource utilization at Wuxi Shuofang Water Treatment Plant. He identified the key technologies for efficient organic matter conversion to achieve sludge resource utilization and reduction, and constructed a technical system for the high - quality cascade conversion and ultra - high reduction of organic solid waste. He formed key technologies and equipment integration innovations centered around fine hydrolysis of sludge to release carbon, anaerobic fermentation to produce acids, microbial regulation, and membrane bioreactors, formulated industrial process conditions, and developed and put into production an industrial production line.