Abstract

This study was carried out to assess the wastewater treatment efficiency of rice paper craft villages with activated sludge supplemented with probiotics. With probiotic BHT preparation (including strains: Bacillus thuringiensis, Bacillus cereus, Bacillus sp., Pseudomonas sp., Saccharomyces cerevisiae), the density of microorganisms of 108 CFU/g, selecting the appropriate retention time of 9 days for the highest treatment efficiency, in which COD treatment reached 81%, BOD5 treatment reached 82%, TSS treatment reached 55.7% and met QCVN 40:2011/BTNMT (column B). When adding BHT and Bio-EM probiotics to activated sludge to treat rice paper processing wastewater with a retention time of 16 hours, the initial COD value of 500 mg/l, COD treatment efficiency of rice paper processing wastewater by activated sludge, activated sludge supplemented with BHT, and activated sludge supplemented Bio-EM was 93.3, 93.5, and 94.4%, respectively and suitable for rice paper processing influent with COD less than 500 mg/l and the frequency of probiotics addition was once every 15 days with a microorganism density of 108 CFU/g.

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