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Liu Q.,Shanghai University | Zhang X.,Shanghai University | Yu L.,Shanghai Pucheng Thermal Power Energy Co. | Zhao A.,Shanghai Engineering Research of Municipal Solid Waste Treatment and Recycle | And 4 more authors.
Bioresource Technology | Year: 2011

This research for the first time investigated hydrogen production from the fresh leachate originated from municipal solid wastes. We found that fermentation of the leachate generated H2 and was very much enhanced in the presence of extra phosphate in the batch reactor. The continuous expanded granular sludge bed (EGSB) reactor started to generate H2 at day 20 and continued to 176days with 120mg/l of extra phosphate present. The highest chemical oxygen demand (COD) removal efficiency (66.9%) was achieved at liquid up-flow velocity of 3.7m/h and hydraulic retention time of 12h. Under proposed optimal operation conditions, the mean H2 production rate reached up to 2155ml/(lday). We also found that over 80% liquid metabolites were acetic acid and ethanol, suggesting the ethanol-type fermentation was dominant in the bioreactor. These findings indicate that the fresh leachate can be used as the source for continuous hydrogen production. © 2010 Elsevier Ltd. Source


Zhao J.,Shanghai University | Lu X.-Q.,Shanghai University | Luo J.-H.,Shanghai University | Liu J.-Y.,Shanghai University | And 6 more authors.
International Biodeterioration and Biodegradation | Year: 2013

Fresh leachates in different seasons from a refuse transfer station in Shanghai were characterized and seasonal impact on physicochemical characteristics of the leachates was investigated. The leachate properties, including concentration of organic substances, nitrogen distribution, electric conductivity (EC), oxidation-reduction potential (ORP), etc. had been monitored in summer and winter. The results showed that pH, COD, TOC, TN and EC of the leachate in winter were much higher than those in summer. While other parameters, such as inorganic nitrogen, ORP, metals, TSS and VSS, showed no considerable distinction between the two seasons. Three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy was also conducted to characterize dissolved organic materials (DOM) of the leachate. The observation revealed that seasonal variations had direct effects on the fundamental characteristics of raw leachate, which provided useful potential reference for fresh leachate bio-treatment. © 2013 Elsevier Ltd. Source


Liu Q.,Shanghai University | Zhang X.L.,Shanghai University | Jun Z.,Shanghai University | Zhao A.H.,Shanghai Engineering Research of Municipal Solid Waste Treatment and Recycle | And 5 more authors.
Bioresource Technology | Year: 2012

Carbonate was added into a co-culture of glucose and fresh leachate under alkaline condition to enhance batched acidogenesis and fermentative hydrogen production simultaneously. Results indicated carbonate has positive effect on both H 2 production and acetic acid generation. The highest hydrogen yield (about 1.40mol/mol glucose) was obtained at [CO32-]=280mg/L with pH 8.0 and [CO32-]=560mg/L with pH 9. The dominant liquid metabolites were ethanol, acetic and butyric acid. The highest total volatile fatty acid yield (0.38g/g glucose) was achieved at [CO32-]=560mg/L with pH 9. In this case, the acetic acid yield reached 0.13g/g glucose. Verification tests using simulated wastewater as substrate were also carried out at pH 9. Results demonstrated calcium ions inhibit hydrogenogens activity while carbonate addition can alleviate the suppression effect caused by Ca 2+. © 2012 Elsevier Ltd. Source

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