Abstract：
:The anaerobic co-digestion of glycerol and wastewater derived from biodiesel manufacturing, in which COD was found to be 1054 and 428 g/L, respectively, was studied in batch laboratory-scale reactors at mesophilic temperature (35 degrees C). Glycerol was acidified with H(3)PO(4) in order to recover the alkaline catalyst employed in the transesterification reaction (KOH) as agricultural fertiliser (potassium phosphates). Wastewater was subjected to an electrocoagulation process in order to reduce its oil content. After mixing, the anaerobic revalorisation of the wastewater was studied employing inoculum-substrate ratios ranging from 5.02 to 1.48 g VSS/g COD and organic loading rates of 0.27-0.36 g COD/g VSS d. Biodegradability was found to be around 100%, while the methane yield coefficient was 310 mL CH(4)/g COD removed (1 atm, 25 degrees C). At the equilibrium time, the proportionality between r' and the load was constant, showing 1.55 mL CH(4)/(g VSS g COD h). The results showed that anaerobic co-digestion reduces the clean water and nutrient requirement, with the consequent economical and environmental benefit.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Siles JA,Martín MA,Chica AF,Martín Adoi
10.1016/j.biortech.2010.03.042subject
Has Abstractpub_date
2010-08-01 00:00:00pages
6315-21issue
16eissn
0960-8524issn
1873-2976pii
S0960-8524(10)00519-5journal_volume
101pub_type
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