Scavenging of heavy metal by microalgae.pptx

removal of toxic metals

1. Scavenging of heavy metal by microalgae SEMINAR ON IST SEMESTER PRESENTED BY: Juliet Princy Bai A 24355 Microalgal Technology PG & Research Department of Microbiology Sri Paramakalyani College Alwarkurichi .

2. T able of content Introduction Sources Why scavenging of heavy metal is essential? Procedure Process Conclusion Reference 2

3. introduction 3 Heavy metals are toxic, dense metals with high atomic weights, such as lead (Pb), mercury (Hg),cadmium (Cd), arsenic (As), and chromium (Cr). Scavenging of heavy metals by microalgae refers to the process by which microalgae remove heavy metals from their environment through various mechanisms.

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5. 5 Heavy metals are one of the many components present in soil but in recent years their presence in the environment has increased due to human activities such as mining, energy production, fuel production, electroplating, wastewater sludge treatment, and agriculture. T hese contaminants are able to infiltrate deep into the layer of underground waters and pollute the groundwater as well as the surface water. Heavy metals in the soil subsequently enter the human food web through plants. On entering the food chain, these heavy metals profoundly disrupt biological processes and hence are a serious threat to human health. Thus, heavy metal contamination of agricultural soils has become a serious issue in crop production and human health in many developed as well as developing countries. why scavenging of heavy metal is essential ?

6. ADD A FOOTER 6 POSSIBLE EFFECTS OF ABSORPTION OF HEAVY METAL TO OUR BODY

7. Procedure - scavenging of heavy metal by micro algae

8. 8 Microalgae that involves in this process Chlamydomonas reinhardtii - Lead ( Pb ) Spirulina platensis - Mercury (Hg) Chlorella vulgaris - Cadmium (Cd) Scenedesmus quadricauda - Chromium (Cr) Dunaliella salina - Copper (Cu) Haematococcus pluvialis - Arsenic (As) Nannochloropsis oculata - Zinc (Zn) Tetraselmis suecica - Nickel (Ni) Phaeodactylum tricornutum - Cobalt (Co) Isochrysis galbana - Silver (Ag)

9. 9 Case Study : Removal of Lead (Pb) from Contaminated Water using Chlamydomonas reinhardtii . Location: Industrial wastewater treatment plant. Problem: High levels of lead (Pb) in wastewater, exceeding regulatory limits. Solution: 1. Cultivate Chlamydomonas reinhardtii microalgae in a photobioreactor 2. Feed the contaminated wastewater into the photobioreactor 3. Allow the microalgae to scavenge Pb from the wastewater 4. Harvest the microalgae and remove the Pb-rich biomass 5. Treat the biomass to recover the Pb for recycling or safe disposal. Results: - Pb removal efficiency : 85% Final Pb concentration in wastewater : below regulatory limits Microalgae biomass production: 10 tons/week Recovered Pb: 500 kg/week. Benefits:- Effective removal of Pb from contaminated wastewater Production of valuable microalgae biomass for animal feed or biofuels Recovery of Pb for recycling or safe disposal Environmentally friendly and sustainable solution

10. 10 This graph shows, Heavy metal premoved by microalgae

11. 11 process involving in scavenging of heavy metal by micro algae

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17. ADD A FOOTER 17 why we choose microalgae ?

18. CONCLUSION 18 Microalgae can effectively remove heavy metals from contaminated water and soil. The process involves biosorption, bioaccumulation, and biotransformation. Microalgae can accumulate and remove various heavy metals, including Pb, Cd, Cr, Hg, and As.

19. 19 Micro- algae are known toper form well at low levels of contaminants; they do not generate toxic sludge, are easy to culture and maintain, have a good binding affinity (due to relatively high specific surface are a and negative charge), and, are suitable for small- scale as well as large- scale remediation strategies. Apart from averting the adverse consequences of HMs in the environment, microalgae quintessentially provide an ecofriendly means of carbon-dioxide mitigation; however, the main advantages of micro- algae mediated sorption include its efficacy and low-cost. Despite these advantages, there are scarce microalgal technologies with commercial success as yet. Therefore, efforts need to be focused on removal and recovery of HMs using microalgae; this would include the development of innovative technologies, or improvising the existing ones. A holistic multi disciplinary approach involving chemists, engineers and biologists would be beneficial in this regard. With increasing availability of knowledge regarding improved selectivity, better shelf-life, efficacy, specificity, economic viability and a convincing market, there is bound to be a huge market for these eco-friendly bio sorbents in the future. future avenues

20. 1. Biosorption of heavy metals by microalgae: A review" (2020) - Journal of Environmental Sciences 2. "Microalgae-based heavy metal removal from wastewater: A review" (2019) - Bioresource Technology 3. "Heavy metal removal from contaminated water by microalgae: A review" (2018) - Journal of Water Research 4. "Microalgae for heavy metal bioremediation: A review" (2017) - Journal of Biotechnology 5. "Biosorption of heavy metals by microalgae: A review of the mechanisms and applications" (2016) - Journal of Environmental Management 20 reference

21. SUBMITTED TO: Dr.G.Ramanathan Assistant Professor PG & Research Department Of Microbiology Sri Paramakalyani College Alwarkurichi THANK YOU