Treatment Of Brewery Wastewater Using Sand And Carbon Fixed Bed

Reclamation of process wastewater is a key to water resources conservation and sustainability.rnSince brewery is inherently associated with the use of considerable amount of water, this studyrnwas undertaken to investigate the appropriate treatment of wastewater generated by Heinekenrnbrewery for the possibility of reuse. For this work, samples of wastewater were collected andrncharacterized. Series of experiments were conducted to determine the amount of alum to use byrnJar test, the property of the sand using sieve analysis and finally treatment of the wastewater wasrncarried out using fixed bed filtration column consisting of granular activated carbon and sand.rnThe characterization of the raw wastewater results obtained before application of the treatmentrnfor the biologically treated wastewater showed that 67.11NTU, 89.33 mg/l, 4.4 mg/l, 1.06 mg/l,rn4.3mg/l and 1.92mS/cm for Turbidity, COD, TN, Ammonia, TP and EC respectively. ThenrnSeries of jar test experiments were conducted in which the efficiencies of ferric chloride andrnalum were compared with in a coagulation/flocculation process at discharge pH. Overall, alumrnwas found to be a more preferable coagulant at a dosage of 40mg/l. After wards fixed bedrnfiltration column was constructed from Granular activated carbon and Mojo sand. The sand wasrncharacterized by using sieve analysis and its uniformity coefficient, density and effective size isrnfound to be 5.67, 1.66 g/ml, 0.15 – 0.85 mm respectively. Sample results of the analysis afterrnusing the fixed bed filtration showed that overall concentration of turbidity were reduced from 73rnNTU to 25.92 NTU and COD from 98 mg/l to 32.02mg/l which didn’t fit with the specifiedrnstandards for industrial reuse, where as for the conventional filtration, it reduced to 2.22 NTUrnand 3mg/l which directly fits with the standards set by EPA, WHO and Heineken for industrialrnreuse. So a successive additional treatment of TN, Ammonia, TP and EC were done and resultedrnin reduction from 4.4 mg/l, 1.06 mg/l, 4.3mg/l and 1.92mS/cm to 0 mg/l, 0 mg/l, 0mg/l andrn0.65mS/cm. These results showed that coagulation/flocculation and sedimentation stage improvernthe subsequent filtration process. These experimental results showed that the effluent fromrnconventional treatment could be reused for boiler feed, cooling and process water.

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