scholarly journals Characterization of tannery wastewater and its treatment by aquatic macrophytes and algae

2015 ◽  
Vol 49 (4) ◽  
pp. 233-242 ◽  
Author(s):  
MAA Jahan ◽  
N Akhtar ◽  
NMS Khan ◽  
CK Roy ◽  
R Islam ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aquatic Plants ◽  
Biological Treatment ◽  
Oxygen Demand ◽  
Tannery Wastewater ◽  
Toxic Substances ◽  
Physiochemical Parameters ◽  
Combination Treatments ◽  
Removal Of Heavy Metals ◽  
Total Dissolved Solid

Tannery wastewater contains large amount of chemical compounds including toxic substances. So an attempt was made to characterize physiochemical parameters of tannery wastewater and investigate the efficacy, and applicability of the biological treatment utilizing aquatic plants macrophytes and algae. Total suspended solids TSS and total Dissolved solid in the original wastewater were found 1250 mg/l and 21300 mg/l respectively. The pH and temperature were 8.3 and 29°C. Dissolved Oxygen (DO), Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) were 2.72 mg/l, 4464 mg/l and 12840 mg/l respectively. Electrical conductivity (EC) was 42500 ?S/cm anions PO43- and Cl- were 17.1 mg/l and 13.8 mg/l respectively. Heavy metals were also analysed. Fe, Na, Zn, Cr, Pb and Ca were found 14.675 mg/l, 12006 mg/l, 1.5241 mg/l, 10.348 mg/l, 0.1818 mg/l and 0.4112 mg/l respectively. Biological treatment with aquatic plants, algae and their combination treatments were found to be effective for the reduction of some physiochemical parameters. Treatment conducted with Eichhornia crassipes was found most effective in reducing COD, EC, TDS and TSS. Mixed treatment resulted reduction of pH from 8.3 to 6.21. Both macrophytes and algae exhibited good heavy metal uptake tendency, but Eichhornia crassips was identified as most effective for the removal of heavy metals in the wastewater because of its extensive root system which provides to help the uptake of pollutants from the wastewater. DOI: http://dx.doi.org/10.3329/bjsir.v49i4.22626 Bangladesh J. Sci. Ind. Res. 49(4), 233-242, 2014

scholarly journals CHARACTERISTICS OF LEACHATE AT IHIAGWA DUMPSITE, IMO STATE NIGERIA AND THEIR IMPLICATIONS FOR SURFACE WATER POLLUTION

2021 ◽  
pp. 1-11
Author(s):  
CT Nelson ◽  
GT Amangabara ◽  
CO Owuama ◽  
CN Nzeh ◽  
CN Uyo
Keyword(s):  
Heavy Metals ◽  
Chemical Properties ◽  
Total Solid ◽  
Toxic Substances ◽  
Landfill Leachates ◽  
Total Chloride ◽  
Metal Cyanide ◽  
Physico Chemical ◽  
High Concentrations ◽  
Total Dissolved Solid

Open dumpsite is the most common way to eliminate solid urban wastes in this part of the world. An important problem associated to landfills and open dumpsite is the production of leachates. The leachates from these dumpsites have many toxic substances, which may adversely affect the environmental health. Thus in order to have a better management of characteristics of Ihiagwa-Nekede waste dump leachates, representative leachate samples were collected and analyzed for Physico-chemical properties and levels of heavy metals in them. Results indicate pH7.38, temperature 28.30 ℃ - 28.40℃, total dissolved solid 124.01mg/l-125.45mg/l, magnesium hardness 4.40mg/l-7.32mg/l, sulphate 3.60mg/l-3.70mg/l, and nitrate 27.00mg/l-27.60mg/l. Other parameters indicated as follows Conductivity1910𝜇𝑠/𝑐𝑚-1930.00 𝜇𝑠/𝑐𝑚, total chloride 891.72mg/l-891.74mg/l, carbonate 1708.00mg/l-1904.00mg/l, Ammonia 9.39mg/l-9.40mg/l, calcium hardness 373.17mg/l-375.61mg/l, total solid 2423.00mg/l-2454.00mg/l, phosphate 13.52mg/l-13.54mg/l. The heavy metal: cyanide 2.25mg/l-2.33mg/l, zinc 18.08mg/l-18.38mg/l, copper 19.90mg/l20.48mg/l, iron10.67mg/l-10.82mg/l, lead 1.27mg/l-1.41mg/l, and manganese 3.00mg/l-3.61mg/l, all these exceeded the WHO standards. The obtained results showed that the landfill leachates are characterized by high concentrations of heavy metals and other disease causing elements and therefore require urgent treatment to forestall the contamination of groundwater system and the nearby Otamiri River.

scholarly journals Evaluation of Fresh Water Actinomycete Bioflocculant and Its Biotechnological Applications in Wastewaters Treatment and Removal of Heavy Metals

2019 ◽  
Vol 16 (18) ◽  
pp. 3337 ◽  
Author(s):  
Mayowa Oladele Agunbiade ◽  
Carolina Pohl ◽  
Esta Van Heerden ◽  
Oluwaseun Oyekola ◽  
Anofi Ashafa
Keyword(s):  
Heavy Metals ◽  
Oxygen Demand ◽  
Optical Emission ◽  
Dairy Wastewater ◽  
Polyaluminum Chloride ◽  
Flocculating Activity ◽  
Wastewaters Treatment ◽  
Removal Of Heavy Metals ◽  
Health Related ◽  
Rdna Analysis

This study evaluated the potential of a biopolymeric flocculant produced by Terrabacter sp. isolated from Sterkfontein Dam, South Africa. Microbial flocculants aid the aggregation of suspended solutes in solutions, thus, suggesting its alternative application to inorganic and synthetic organic flocculants, which are associated with health-related problems. The 16S rDNA analysis revealed the bacteria to have 98% similarity to Terrabacter sp. MUSC78T and the sequence was deposited in the Genbank as Terrabacter sp. with accession number KF682157.1. A series of experimental parameters such as bioflocculant dosage, cations concentrations, pH, and application of the purified bioflocculant in wastewaters treatment were investigated. In the presence of glucose as a sole carbon source, Ca2+ as cation at pH 8, the optimal flocculating activity attained was 85%. Optimum bioflocculant dosage of 0.5 mg/mL was able to remove chemical oxygen demand (COD), biological oxygen demand (BOD), suspended solids (SS), nitrate, and turbidity in dairy wastewater. In addition, the tested bioflocculant exhibited higher flocculating efficiency as compared to polyaluminum chloride, polyethylenime, and alum. Inductible coupled plasma optical emission spectroscopy (ICP-OES) analyses confirmed significant removal of 77.7% Fe, 74.8% Al, 61.9% Mn, and 57.6% Zn as representatives of heavy metals from treated dairy wastewater. Fourier transform infrared spectroscopy (FTIR) indicated the presence of carboxyl, hydroxyl, and amino groups in the purified bioflocculant which could be responsible for flocculation. Findings from this study showed the prospect of the studied bioflocculant as an alternative candidate in wastewater treatment and remediating of heavy metals.

Removal of Heavy Metals from Aquatic Environments Using Water Hyacinth and Water Lettuce

2018 ◽  
Vol 68 (12) ◽  
pp. 2765-2767 ◽  
Author(s):  
Violeta Monica Radu ◽  
Petra Ionescu ◽  
Elena Diacu ◽  
Alexandru Anton Ivanov
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aquatic Plants ◽  
Water Hyacinth ◽  
Graphite Furnace ◽  
Atomic Absorption Spectrophotometry ◽  
Aquatic Environments ◽  
Water Lettuce ◽  
Removal Of Heavy Metals ◽  
Eichornia Crassipes

The quality of the aquatic environment was strongly influenced by the development of urbanization, industrialization and population growth, and therefore water pollution, mainly due to the presence of heavy metal, becoming a widespread concern. The objective of this work was to evaluate the possibility to remove heavy metals Cd, Zn, Cr and Ni from wastewater using two aquatic plants, water hyacinth (Eichornia crassipes) and water lettuce (Pistia stratiottes). These plants possess excellent abilities to metabolize and bioaccumulate heavy metals from various polluted aquatic environments. For a period of 30 days, the content of heavy metals from wastewater and aquatic plants samples was monitored weakly and the efficacy of these plants to remove heavy metals was quantified. Heavy metals were determined by atomic absorption spectrophotometry with graphite furnace (GFAAS). The obtained results have shown the efficacy of Eichornia crassipes and Pistia stratiottes to remove metals from the studied wastewater. The bioaccumulation rate of heavy metals in plants was effective until day 24 of the period of 30 days of the experiment, as the plants become inefficient beyond this period. The uptake of heavy metals in the studied aquatic plants depends on the concentration of each heavy metal present in the used wastewater and the exposure time.

Biosorption of Uranium Heavy Metals

2018 ◽  
pp. 80-91
Author(s):  
Ashok K. Rathoure ◽  
Sudhanshu Mishra ◽  
Sandeep Tripathi
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Physical Adsorption ◽  
Van Der Waals Forces ◽  
Natural Process ◽  
Toxic Substances ◽  
High Toxicity ◽  
Uranium Removal ◽  
Removal Of Heavy Metals ◽  
Surface And Groundwater

Uranium is a seriously threatening heavy metal because of its high toxicity and radioactivity. Uranium contaminates surface and groundwater. Metal removed from aqueous solutions often leads to effective metal concentration. Apart from the slow natural process of metal mineralization, removal of heavy metals is attained when the metal becomes concentrated at a point that it is either returned to the process or resold. Physical adsorption takes place due to van-der Waals' forces. Conventional methods used for uranium removal are expensive and produce huge amount of sludge (consists of toxic substances) which blockade the membrane. In this chapter, uranium removal by biosorption method is discussed. Uranium removal is attained by the use of either living microorganisms (bacteria, algae, and fungi) or their dead biomasses.

scholarly journals Implementation of Modified Acacia Tannin by Mannich Reaction for Removal of Heavy Metals (Cu, Cr and Hg)

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 352 ◽  
Author(s):  
Lorena Lugo ◽  
Alison Martín ◽  
John Diaz ◽  
Alejandro Pérez-Flórez ◽  
Crispin Celis
Keyword(s):  
Heavy Metals ◽  
Mannich Reaction ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Direct Mercury Analyzer ◽  
Removal Of Heavy Metals ◽  
Mercury Analyzer ◽  
Flocculation Process ◽  
Different Levels ◽  
Different Doses

The modified tannin by Mannich reaction was investigated for wastewater treatment. The removal of heavy metals, such as copper, chromium and mercury, in industrial wastewater was evaluated through the coagulation–flocculation technique, using modified Acacia tannin (MAT) as a coagulant agent. The successful tannin modification was evaluated by infrared spectopometry (FTIR), nuclear magnetic resonance (NMR); monitoring the removal of heavy metals was performed by atomic absorption (AA) and a direct mercury analyzer (DMA). Additionally, the parameters of water quality, total suspended solids (TSS), turbidity and chemical oxygen demand (COD) were assessed. Different doses of MAT were evaluated (375 ppm, 750 ppm, 1250 ppm and 1625 ppm) and three different levels of pH (4, 7 and 10). The highest percentages of removal obtained were copper 60%, chromium 87%, mercury 50%–80%, COD 88%, TSS 86% and turbidity 94%, which were achieved with the dose of 375 ppm of MAT at pH 10. The coagulation–flocculation process with the modified Acacia tannin is efficient for the removal of conventional parameters and for a significant removal of the metals studied.

scholarly journals Experimental Investigation of Chlorella vulgaris and Enterobacter sp. MN17 for Decolorization and Removal of Heavy Metals from Textile Wastewater

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3034
Author(s):  
Muhammad Mubashar ◽  
Muhammad Naveed ◽  
Adnan Mustafa ◽  
Sobia Ashraf ◽  
Khurram Shehzad Baig ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Chlorella Vulgaris ◽  
Textile Industry ◽  
Oxygen Demand ◽  
Industrial Effluents ◽  
Textile Wastewater ◽  
Removal Of Heavy Metals ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Coloring Agents

The present study evaluated the performance of microalgae Chlorella vulgaris in an Enterobacter sp. MN17-assisted textile industry wastewater treatment system for decolorization, removal of heavy metals (Cu, Cr, Pb, and Cd), and chemical oxygen demand (COD). Different dilutions (5, 10, and 20%) of wastewater were prepared to decrease the pollutant toxicity for culturing microalgae and bacteria. Reduction of color, COD, and metal contents by microalgal treatment of wastewater varied greatly, while removal efficiency (RE) was significantly enhanced when endophytic bacterial strain MN17 inoculum was applied. Most notable, results were found at a 5% dilution level by Enterobacter sp. MN17-inoculated C. vulgaris medium, as chromium (Cr), cadmium (Cd), copper (Cu), and lead (Pb) concentrations were decreased from 1.32 to 0.27 mg L−1 (79% decrease), 0.79–0.14 mg L−1 (93% decrease), 1.33–0.36 mg L−1 (72% decrease), and 1.2–0.25 mg L−1 (79% decrease), respectively. The values of COD and color were also significantly decreased by 74% and 70%, respectively, by a C. vulgaris–Enterobacter sp. MN17 consortium. The present investigation revealed that bacterial inoculation of microalgae significantly enhanced the removal of coloring agents and heavy metals from textile wastewater by stimulating the growth of algal biomass. This study manifested the usefulness of microalgae–bacterial mutualism for the remediation of heavy metals, COD, and color in industrial effluents. Microalgae consortia with growth promoting bacteria could be a breakthrough for better bioremediation and bioprocess economy. Thus, further studies are needed for successful integration of microalgae–plant growth promoting bacterial (PGPB) consortium for wastewater treatments.

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