Furfural wastewater pretreatment of corn stalk for whole slurry anaerobic co-digestion to improve methane production

Coupling Anaerobic Digestion with Pyrolysis for Phosphorus-Enriched Biochar Production from Constructed Wetland Biomass

“…The obvious cellulose crystals in the solid digestate resulted from the incomplete degradation of cellulose during the AD process. 22 Ca 3 (PO 4 ) 2 appeared in both TBs and ATBs, which was consistent with the previous studies on the change in mineral crystals in Napier grass, 11 suggesting that stable P would be formed during pyrolysis. With the increase in the pyrolysis t em perature, the di ff raction pea k o f Fe 5 (PO 4 ) 4 (OH) 3 •2H 2 O in ATBs was gradually weakened, implying that iron hydroxyl-phosphate was transformed into other P species during pyrolysis.…”

“…In addition, the camel peak (∼20°) in biomass and solid digestate diffraction patterns was cellulose crystals. The obvious cellulose crystals in the solid digestate resulted from the incomplete degradation of cellulose during the AD process . Ca 3 (PO 4 ) 2 appeared in both TBs and ATBs, which was consistent with the previous studies on the change in mineral crystals in Napier grass, suggesting that stable P would be formed during pyrolysis.…”

“…The increase in the C content in biochar during pyrolysis was due to the formation of aromatic structure, which may be attributed to the breakage of the carbon−hydrogen and carbon−carbon bonds. 36 However, van der Waals forces, hydrogen bonds, and chemical bonds in lignocellulose would be destroyed during AD, 22 which might affect the stability of organic compounds in biogas residue and make it difficult to form aromatic structures in biochar. The ratios of O/C and H/ C in TBs and ATBs decreased with increasing pyrolysis temperature, suggesting that the biochars obtained at high temperatures have higher aromaticity and less polar structure regardless of whether the AD treatment was used.…”

“…Anaerobic digestion (AD) is a biological treatment technique to convert the organic matter in the biomass waste into biogas (e.g., CH 4 and CO 2 ) under anaerobic conditions. , Considering that AD could dispose of wet solid waste and produce value-added biogas, the coupling of AD with pyrolysis has been investigated to improve the efficiency of the waste treatment system . The coupling technique greatly elevated the yields of biochar and gas but declined the tar yield, as well as achieved higher energy efficiencies .…”

Activated Carbon Facilitates Anaerobic Digestion of Furfural Wastewater: Effect of Direct Interspecies Electron Transfer

“…Industrial wastewater containing toxic chemicals is the main source of widespread water pollution. , As a harmful and refractory pollutant, furfural commonly exists in various industrial wastewaters, including diosgenin factories, furfural manufacturing plants, and petroleum refineries. − Additionally, furfural wastewater can be produced when biomass wastes are thermochemically pretreated for subsequent bioenergy utilization . For example, one ton of furfural can produce about 20–30 tons of furfural wastewater, and more than 200 factories in China generated about 4–6 million tons of furfural wastewater annually . Compared with the membrane technique, adsorption, and photodecomposition in furfural removal, microbial bioremediation is considered the most efficient and promising strategy. − Furfural is thought to be harmful to human health and can cause irritation because of its high toxicity .…”