Fertilizer potential of liquid product from hydrothermal treatment of swine manure. (July 2018)

• Record Type: Journal Article
• Authors: Yuan, Tian; Cheng, Yanfei; Huang, Weiwei; Zhang, Zhenya; Lei, Zhongfang; Shimizu, Kazuya; Utsumi, Motoo
• Is Part Of: Waste management. Volume 77(2018)
• Page Start: 166
• Page End: 171
• Publication Date: 2018-07
• Subjects: Hydrothermal treatment -- Liquid fertilizer -- Swine manure; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2018.05.018
• Languages: English
• ISSNs: 0956-053X

Abstract

Highlights: Fertilizer potential of liquid product of swine manure after HTT was first evaluated. 98% of N in manure was converted to soluble form after HTT at 200 °C for 60 min. GI over 100% was achieved using the liquid product from HTT at 150 °C for 60 min. Heavy metal contents in liquid product were within the thresholds for plant growth. Abstract: Compared with composting, hydrothermal treatment (HTT) technology can dramatically shorten the duration for manure waste treatment. This study firstly investigated the effect of HTT on solubilization of N, P and organics from swine manure, and then evaluated the phytotoxicity of liquid product from hydrothermally treated manure by seed germination test. Results show that 98% of N in manure could be converted into soluble form after HTT at 200 °C for 60 min. Soluble P in hydrothermally treated manure (at 150 °C for 60 min) was 2.7 times that in raw manure. The germination indices (GI) were all greater than 100% when the liquid product (from HTT at 150 °C for 60 min) or its diluted samples being used. Results from this study suggest that HTT could be a promising technology for producing safe and value-added liquid fertilizers from swine manure.