Abstract
Cost-effective treatment of dyeing wastewater remains a challenge. In this study, a newly designed hydrolysis acidification flat-sheet ceramic membrane bioreactor (HA-CMBR) was used in treating high-strength dyeing wastewater. The start-up phase of the HA-CMBR was accomplished in 29 days by using cultivated seed sludge. Chemical oxygen demand (COD) removal rate reached about 62% with influent COD of 7800 mg/L and an organic loading rate of 7.80 kg-COD/(m3·d). Chromaticity removal exceeded 99%. The results show that the HA-CMBR has good removal performance in treating dyeing wastewater. The HA-CMBR could run with low energy consumption at trans-membrane pressure (TMP) <10 kPa due to the good water permeability of the flat-sheet ceramic membrane. New strains with 92%–96% similarity to Alkalibaculum bacchi, Pseudomonas sp., Desulfovibrio sp., and Halothiobacillaceae were identified in the HA-CMBR. Microbial population analysis indicated that Desulfovibrio sp., Deltaproteobacteria, Halothiobacillaceae, Alkalibaculum sp., Pseudomonas sp., Desulfomicrobium sp., and Chlorobaculum sp. dominated in the HA-CMBR.
Highlights
China is the world’s largest producer of dyes, at more than 1.15 × 109 kg annually [1]
The results show that the hydrolysis acidification flat-sheet ceramic membrane bioreactor (HA-CMBR) has good chroma removal performance in treating the dyeing wastewater used in this study
The average Total nitrogen (TN) and Total phosphorus (TP) removal rates were 20% and 6% in the HA-CMBR, which are similar to the results reported by Jin et al [24]
Summary
China is the world’s largest producer of dyes, at more than 1.15 × 109 kg annually [1]. Physical and chemical methods are usually used to treat dyeing wastewater [6] Res. Public Health 2019, 16, 777 real dyeing wastewater and achieved 73% color removal and 68% COD removal with a cycle time of 24 h and an anaerobic-to-aerobic period of 3:1. Hydrolysis acidification based on flat-sheet ceramic membranes is suggested to be evaluated in treating dyeing wastewater. There are no previous reports on hydrolysis acidification based on flat-sheet ceramic membranes used for treating dyeing wastewater. The present study employs a flat ceramic sheet as the membrane module in a newly developed hydrolysis acidification flat-sheet ceramic membrane bioreactor (HA-CMBR) that was developed for treating dyeing wastewater. The results might provide theoretical guidance and reference for engineering applications
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