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Abstract
Proper treatment of heavy metal ions present in wastewaters is a major concern. With extensive usage in various industries, Cr(VI) contamination has become threatening for the environment. Biosorption is a favorable technique for heavy metals removal. In the present study, dried cyanobacterial consortium of Dinophysis caudata and Dinophysis acuminata were used to assess its biosorption capability. The surface texture and morphology of the biosorbent were obtained through scanning electron microscopy. The presence of different chemical bonds, namely hydroxyl, C–H and C–N, was confirmed through FTIR study. Pseudo-second-order Mckay-Ho model was found to perform best to fit the kinetic data. Temkin adsorption isotherm model fit best to the equilibrium data. Response surface methodology (RSM) was employed to optimize Cr(VI) abatement. Effect of initial concentration (IC) of metal ion, temperature, pH variation and amount of adsorbent (AD) were studied during batch study. Maximum Cr(VI) abatement after 5 min contact time was 80.77% for an IC of Cr(VI) of 25 mg/L, at pH 11 and 45 °C with the AD of 2.5 g/L. The optimum removal conditions as shown by RSM study were IC of Cr(VI): 15 mg/L, AD: 1 g/L, pH: 11, and the removal was predicted as 81.72%. Artificial neural network-based model was further developed based on experimental points which indicated that the model can predict abatement of Cr(VI) for various operating conditions with reasonably high accuracy.
Highlights
Since the dawn of industrialization, water pollution is a critical environmental issue as the industrial wastewater containing various pollutants is directly or indirectly released into the water bodies that undoubtedly interrupt the aquatic biota
Higher pH of the medium facilitates the biosorption process which leads to higher abatement of Cr(VI)
Cyanobacterial consortium consisting of Dinophysis caudata and Dinophysis acuminata, collected from East Kolkata Wetland (EKW), has been proved efficient for the abatement of Cr(VI) from wastewater
Summary
Since the dawn of industrialization, water pollution is a critical environmental issue as the industrial wastewater containing various pollutants is directly or indirectly released into the water bodies that undoubtedly interrupt the aquatic biota. Among the various pollutants such as organic or inorganic chemicals, dyes and pesticides, heavy metals in wastewater play a crucial role due to their toxic and carcinogenic nature (Sen et al 2017). They cannot be biodegraded rather bioaccumulated in the living body causing serious health hazards and even death (Tangahu et al 2011). As per World Health Organization (WHO), the maximum allowable limit of hexavalent chromium is 0.05 mg/L in drinking water (Gupta and Rastogi 2009). Chromium removal from wastewater is mandatory before releasing into the environment
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