title: Effects of volumetric load in an anaerobic sequencing batch biofilm treating industrial saline wastewater.
abstract: Mustard tuber wastewater is of high salinity ([Cl(-1)]=18∼23 g L(-1)), high organic content (chemical oxygen demand, COD=4000±100 L(-1)) and biodegradability (BOD5/COD≈0.5). The anaerobic sequencing batch biofilm reactor (ASBBR) pre-treatment, an important step to meet national discharge standard, was applied to reduce much of the organics in mustard tuber wastewater. The experiment for the effect of the volumetric load on ASBBR treating mustard tuber wastewater was conducted at different hydraulic retention times (HRTs) and volumetric exchange ratios (λ). The ASBBR operating at 50% biomass density, 30 °C, influent COD concentration of 4000±100 mg L(-1) and pH value of 7.0±0.2, the effluent COD concentration increased from 0.22 to 4 kgCOD m(-3) d(-1) when the volumetric load increased from 100 to 1520 mg L(-1). The effluent COD concentration differed when adopted different HRT and λ under the same volumetric load. And given certain influent levels, a higher performance of ASBBR could be achieved at a lower value of HRT and λ. The optimal operational load could be determined by limiting the COD concentration under different discharge conditions, based on the results obtained in experiments.
authors.affiliation: a Key Laboratory of the Three-Gorge Reservoir's Eco-Environments, Ministry of Education , Chongqing University , Chongqing 400045 , People's Republic of China.
authors.forename: Hong-Xiang
authors.initials: HX
authors.lastname: Chai
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Qiang
authors.initials: Q
authors.lastname: He
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
mesh_terms: D000693:Anaerobiosis; D018441:Biofilms; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis; D007220:Industrial Waste / Q000032:analysis; D009149:Mustard Plant; D054712:Salinity; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D005232:Fatty Acids, Volatile; D007220:Industrial Waste
keywords: anaerobic sequencing batch biofilm reactor (ASBBR); hydraulic retention time; industrial saline wastewater; volumetric exchange ratio; volumetric load