Constructed wetland based treatment
1. A planted horizontal subsurface flow constructed wetland was used for removals of phenol, organics, thiocyanate and nitrogen. Typha angustifolia was used as the plant. Phenol and COD removals were 99% and 93%, respectively. Thiocyanate removal was 91% and it converted to sulphate. Higher ambient temperature improved pollutant removals. It is published in this journal:
ü Christy Benny and Saswati Chakraborty, Continuous removals of phenol, organics, thiocyanate and nitrogen in horizontal subsurface flow constructed wetland. Journal of Water Process Engineering, 33 (2020), 101099 (Elsevier, Impact factor = 3.173).
2. In another study a horizontal subsurface flow constructed wetland was used for simultaneous COD and nitrogen removals by step-feeding and intermittent aeration using Typha aungustifolia. The publication from this work is given below:
ü Sagar Patil and Saswati Chakraborty (2017). Effects of step-feeding and intermittent aeration on organics and nitrogen removal in a horizontal subsurface flow constructed wetland. J. Environmental Science and Health Part A, 52(4), 403-412 (Taylor and Francis, IF = 1.425).
Aerobic granular reactor
1. Oily wastewater treatment in aerobic granular reactor
Three inoculum were used for development of granular sludge and subsequent emulsified diesel removal. Micrococcus aloeverae strain showed maximum oil removal of 61% from influent oil concentration of 310 mg/L. Stability and restoration of granular sludge were also studied. This work is published in the following Elsevier Journal:
ü Sayanti Ghosh and Saswati Chakraborty, Influence of inoculum variation on formation and stability of aerobic granules in oily wastewater treatment Journal of Environmental Management, 248 (2019) (Elsevier, IF = 4.865).
2. Aerobic granular reactor for phenol, thiocyanate and ammonia removal
Aerobic granular reactor is used for treatment of phenol, ammonia and nitrogen containing wastewater. Phenol was the only growth supporting substrate. Granules had maximum diameter of 2.9 mm, sludge volume index of 35 mL/g total solids and volatile solids of 4 g/L. We varied cycle time of the reactor, upflow velocity and air flow rate. Phenol and COD removals were complete. Three papers are published from this work:
ü Sachin Kumar Tomar, Saswati Chakraborty (2019). Comparison of rapid granulation developed from the same industrial sludge with two different substrates. International Biodeterioration and Biodegradation, 142, 218-226 (Elsevier, IF= 2.962).
ü Sachin Kumar Tomar, Saswati Chakraborty (2018). Effect of air flow rate on development of aerobic granules, biomass activity and nitrification efficiency for treating phenol, thiocyanae and ammonia. Journal of Environmental Management, 219, 178-188 (Elsevier, IF = 4.01)
ü Sachin Kumar Tomar, Saswati Chakraborty (2018). Characteristics of aerobic granules treating phenol and ammonia at different cycle time and upflow liquid velocity. International Biodeterioration and Biodegradation, 127, 113-123 (Elsevier, IF= 2.962).
Sequential biological reactors from hydrocarbon, sulphide and nitrogen rich wastewater treatment
Sequential anoxic- aerobic moving bed reactors are used for biological treatment of synthetic refinery wastewater having hydrocarbons, phenol, sulphide and nitrogen. Refinery wastewater contains large amounts of sulphide. Sulphide present in the wastewater was converted to elemental sulphur (S0) and recovered as value added product. Almost 50-60% of influent sulphide was recovered as elemental sulphur solid in the anoxic reactor along with removal of most of the pollutants. Four papers are published in international journals from this work:
ü Subrat Kumar Mallick and Saswati Chakraborty, Varied infeed inorganics and organics for the assimilation of aqueous petrochemical products in anoxic fed-batch reactors: Maximizing precipitation of S0. Separation and Purification Technology, 219, 268-280 (Elsevier, IF = 3.927).
ü Subrat Kumar Mallick and Saswati Chakraborty, Bioremediation of wastewater from automobile service station in anoxic- aerobic sequential reactors and microbial analysis. Chemical Engineering Journal, 361, 982-989 (2019) (Elsevier, IF = 6.735).
ü Subrat Kumar Mallick and Saswati Chakraborty, Bioremediation of hydrocarbon containing wastewater in anoxic-aerobic sequential reactors. Environmental Technology (accepted), (Taylor and Francis, IF = 1.76).
ü Subrat Kumar Mallick and Saswati Chakraborty (2017). Treatment of synthetic refinery wastewater in anoxic – aerobic sequential moving bed reactors and sulphur recovery. J. Environmental Science and Health, Part A, 52(13), 1257-1268 (Taylor and Francis, IF = 1.425).
Removal of heavy metals and dyes using amine based functionalized polymers
We synthesized amine based polymers, aniline formaldehyde condensate and polyaniline and used as adsorbents for removals of copper, chromium [Cr(VI) and Cr(III)] from wastewater. Polymer was also used for removal of acid dyes like Acid orange 8 and Acid violet 7. Two publications are achieved recently from this work:
ü Praisy Terangpi, Saswati Chakraborty and Manabendra Ray (article accepted). Improved removal of hexavalent chromium from 10 mg/L solution by new micron sized polymer clusters of aniline formaldehyde condensate. Chemical Engineering Journal, (Elsevier, IF =6.21).
ü Praisy Terangpi and Saswati Chakraborty. Adsorption kinetics and equilibrium studies for removal of acid azo dyes by aniline formaldehyde condensate. Applied Water Science, 7, 3661-3671 (Springer).
Sequential biological treatment of industrial wastewater
We have used sequential moving bed reactor system for removal of toxic pollutants like phenol, ammonia, thiocyanate, pyridine from wastewater in fed batch type reactors by indigenous cultures. Six publications are obtained from this work.
ü Biju Prava Sahariah, J. Anandkumar and Saswati Chakraborty (2018). Pyridine influence on sequential anaerobic-anoxic- aerobic FMBR system for phenol, thiocyanate and ammonia removal. Environmental Technology 39(14), 1786-1794 (Taylor and Francis, IF =1.76).
ü Biju Prava Sahariah, J. Anandkumar and Saswati Chakraborty (2018). Stability of continuous and fed batch sequential anaerobic-anoxic- aerobic moving bed bioreactor systems at phenol shock load application. Environmental Technology, 39(15), 1898-1907 (Taylor and Francis, (IF =1.76).
ü Biju P Sahariah, Saswati Chakraborty (2011). Kinetic analysis of phenol, thiocyanate and ammonia-nitrogen removals in an anaerobic-anoxic-aerobic moving bed bioreactor system. Journal of Hazardous materials, 190(1-3), 260-267.
ü Biju prava Sahariah and Saswati Chakraborty. (2013) Effect of cycle and fill time on performance of sequestial anaerobic-anoxic-aerobic fed batch moving bed reactor. Environmental Technology, 34(1-4):245-56.
ü Biju Prava Sahariah and Saswati Chakraborty. (2013) Performance of anerobic-anoxic-aerobic batch fed moving bed reactor at varying phenol feed concentrations and hydraulic retention time. Clean Technology and Environmental Policy, 15 (2), 225-233.
ü Biju Prava Sahariah and Saswati Chakraborty. (2012) Effect of feed concentration and hydraulic retention time on removal of phenol, thiocyanate and nitrate – nitrogen in anoxic fed batch moving bed reactor. Toxicological and Environmental Chemistry, 94 (9) 1629-1645.