Treatment of tannery wastewater for reuse by physico-chemical processes and a membrane bioreactor

Abstract

Treatment of wastewater from a tannery in Greater Ho Chi Minh City (Vietnam) was investigated on a pilot scale. After pre-treatment by the tannery that included batch-coagulation and sedimentation, the wastewater was treated by dissolved air flotation, a membrane bioreactor (MBR) and granular activated carbon (GAC) for polishing the MBR effluent. The average removal efficiency for organic substances in the MBR was 81% while total nitrogen could only be removed by 36%. The performance of the GAC column could be successfully predicted using adsorption parameters determined in laboratory experiments. A larger proportion of the organics in the MBR effluent was only weakly adsorbable, therefore the usable carbon capacity was limited as confirmed by the modelling approach. The results were used to outline the size of a technical plant with a volumetric loading rate of 3 kg COD/(m 3 *d) for the MBR and a specific carbon demand of about 1.8 kg/m 3 .J. Fettig (corresponding author) V. Pick M. Oldenburg

Thermal swing intermittently-operated biological activated carbon filtration for rapid, non-sewered treatment of psychrophilic black water

“…S1 †) were consistent with previous GAC studies treating complex wastewater streams. 19 Approximately 90% of the contaminants were initially removed from the process stream under all conditions, indicating rapid breakthrough or non-adsorption of about 10% of contaminants. In considering the subsequent breakthrough progression, decreasing flow rate from 7.5 to 3.9 mL min −1 did not change the breakthrough profile, indicating that these contaminants were provided adequate contact time to adsorb and that the process was likely affinity limited.…”

The leather sector diagnosis: what problems? What solutions? : A Moroccan case study

“…The use of chemical treatment techniques facilitates treatment initiation. Notably, a multitude of biological wastewater treatment techniques are used within tanneries, namely: sequencing batch biofilm reactors (SBBRs) (Ozturk et al, 2019), annamox reactors for eliminating nitrogen and partial nitritation (Le et al, 2020), phytoremediation (Nannochloropsis oculata microalgae) (Saranya and Shanthakumar, 2020), wetlands (Ramírez et al, 2019), wetland roofs (Vo et al ., 2017), membrane post-filtration (Cao Ngoc Dan et al, 2015) and conventional membrane bioreactors (Fettig et al, 2016).…”

Overview of treatment methods of tannery wastewater

“…Coagulation and sedimentation were used by Fettig et al [60] to treat TWW. In this method, the effluent is pre-treated with ferrous sulphate, sulfuric acid, poly-aluminium chloride, organic polymer, and dissolved air floatation before being delivered to a membrane bioreactor (MBR) and polished with granulated activated carbon.…”