Treatment of white water with combined predominant bacteria and immobilized enzyme

Abstract

White water treatment with combined predominant bacterial species and immobilized enzyme was investigated. The use of the single predominant bacteria of Brevundimonas diminuta or Virgibacillus pantothenticus resulted in poor treatment responses. With the combined bacterial species, the treatment effect was clearly improved. When the dosage ratio of Brevundimonas diminuta to Virgibacillus pantothenticus was 1:2, the chemical oxygen demand (CODCr) removal rate reached 70.5%, the cationic demand decreased 46.0%, and the electrical conductivity decreased 18.6% after 16 h of treatment. When mixed with the immobilized enzyme, the treatment efficiency increased with the immobilized pectinase dosage. When 8 g/L immobilized pectinase was added, the treatment time was shortened from 16 h to 4 h, the highest removal rate of CODCr was 74.1%, the cationic demand decreased 68.7%, and the electrical conductivity in the white water decreased 30.1%. The results indicated that the combination of predominant bacterial species and immobilized pectinase could greatly improve the treatment efficiency of white water.