Constructed wetlands for waste water treatment: the use of laterite in the bed medium in phosphorus and heavy metal removal

Hydrobiologia ◽  
1996 ◽  
Vol 340 (1-3) ◽  
pp. 323-331 ◽  
Author(s):  
R. B. Wood ◽  
C. F. McAtamney
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Water Treatment ◽  
Constructed Wetlands ◽  
Metal Removal ◽  
Waste Water Treatment ◽  
Heavy Metal Removal

scholarly journals Nanopraticle Ferriferous Hydrosol as an Advanced Reagent for Waste Water Treatment

2017 ◽  
pp. 164-170
Author(s):  
Danas Budilovskis ◽  
Mudis Šalkauskas
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Metal Removal ◽  
Waste Water Treatment ◽  
Heavy Metal Removal ◽  
Raw Material ◽  
Extractable Fraction ◽  
Iron Scrap ◽  
Treatment And Disposal ◽  
Waste Repositories

A new procedure for electroplating waste water treatment using a waste iron scrap by-product for nanoparticle ferriferous hydrosol (FFH) preparation is presented. FFH which contains Fe(II) and Fe(III) was employed for neutralization and heavy metal removal from electroplating wastewater as well as for decontamination of concomitant pollutants such as phosphates, organic compounds, residual oils, dyes and detergents. It is possible due to the simultaneous operation of several different mechanisms: sorption, coagulation, reduction, fertilization and etc. The method is suitable for the purposes of waste water treatment and disposal in compliance with environmental laws and is implemented in some East and West European countries. The results were proved in accredited laboratories in various countries. According to the composition of its water extractable fraction, remaining waste sludge could be safely deposited in urban waste repositories or used as a raw material for production of various technically useful products such as ceramics, pigment, etc. Treated water may be reused in technological processes.

scholarly journals Ion Exchange: The Most Important Chemical Reaction on Earth after Photosynthesis

2020 ◽  
pp. 31-42
Author(s):  
Thounaojam Thomas Meetei ◽  
Yumnam Bijilaxmi Devi ◽  
Thounaojam Thorny Chanu
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Ion Exchange ◽  
Metal Removal ◽  
Waste Water Treatment ◽  
Heavy Metal Removal ◽  
Exchange Capacity ◽  
Soil Reclamation ◽  
Isomorphous Substitution ◽  
Ion Exchange Capacity

Ion exchange is the interchange of equivalent amount of ions from the solution with ions which are swarming in a boundary of charged surface in equilibrium. It is developed due to the presence of charge in the soil colloids or layer lattice clay minerals. The source of charge developed in the colloidal surface site of soil is mainly from two processes viz. isomorphous substitution and pH dependent charge. The charge can be positive or negative due to the exchange reaction in the layer lattice. The ion exchange capacity is the sum of cation exchange capacity (CEC) and anion exchange capacity (AEC). It depends on the types of soil and the amount of charge present in the layer lattice colloidal structure. With high negative charge in the lattice surface the CEC increases and with positive charge the AEC. Ions with higher charge have larger affinity to adsorbed more strongly than lower. Ion exchange capacity in soil has the ability to retained more nutrients in the form of cations or anions making available to plant for a long time which improved the fertility of soil. Leaching loss of different nutrients from the soil is reduced by holding different ions. Ion exchange processes have been widely used for heavy metal removal for waste water treatment and water purification because of its high remedial capacity, high removal efficiency and fast kinetic. Due to its applications in agriculture, environmental management, industries, waste water treatment in mining industries,  laboratory, nanotechnology, geotechnical and other soil reclamation processes it is considered as the second most important reaction in the globe after photosynthesis.

Polyvinyl alcohol/polysaccharide hydrogel graft materials for arsenic and heavy metal removal

2015 ◽  
Vol 39 (7) ◽  
pp. 5823-5832 ◽  
Author(s):  
Md. Najmul Kabir Chowdhury ◽  
Ahmad Fauzi Ismail ◽  
Mohammad Dalour Hossen Beg ◽  
Gurumurthy Hegde ◽  
Rasool Jamshidi Gohari
Keyword(s):  
Heavy Metal ◽  
Water Treatment ◽  
Polyvinyl Alcohol ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Hydrogel Formation ◽  
Polysaccharide Hydrogel ◽  
Metallic Species

Polyvinyl alcohol/polysaccharide hydrogel formation ((A)–(C)) and metallic species adsorption ((D)) for water treatment.

Research Progress in Removing Heavy Metals from Waste Water via Bio-Sorption

2014 ◽  
Vol 587-589 ◽  
pp. 692-695
Author(s):  
Wei Sun
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Water Treatment ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Waste Water Treatment ◽  
Research Progress ◽  
Traditional Methods ◽  
Sorption Method

Bio-absorption has an unparalleled advantage over other traditional methods in removing and recycling heavy metal ions from waste water. Consequently, it has a promising future. In this paper, the traditional methods and the bio-sorption method via which heavy metals are removed from waste water are compared to summarize the mechanism of bio-sorption, the types of bio-sorbent, the factors that can influence bio-sorption and the state of its application in waste water treatment .

scholarly journals Copper doped zeolite composite for antimicrobial activity and heavy metal removal from waste water

BMC Chemistry ◽  
2019 ◽  
Vol 13 (1) ◽  
Author(s):  
Feleke Terefe Fanta ◽  
Amare Aregahegn Dubale ◽  
Dawit Firemichael Bebizuh ◽  
Minaleshewa Atlabachew
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Antimicrobial Activity ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Zeolite Composite

scholarly journals Cyclopentane hydrate-based processes for treating heavy metal containing wastewater

2019 ◽  
Vol 118 ◽  
pp. 04039
Author(s):  
Yamei Yang ◽  
Hang Zhou ◽  
Feng Li ◽  
Changrui Shi ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Water Treatment ◽  
Enrichment Factor ◽  
Treatment Process ◽  
Waste Water Treatment ◽  
Water Recovery ◽  
Water Treatment Process ◽  
Metal Recycling

The scarcity of water and increasing water pollution are the pressing challenge human being facing. Recovering water and valuable heavy metals is highly desired for treating heavy metal containing wastewater. We proposed a novel hydrate-based process to treat Ni2+ containing wastewater. The water recovery, Ni2+ enrichment factor, desalination efficiency were studied using this cyclopentane hydrate-based method. A water recovery of 43% can be obtained with a desalination efficiency of round 88% and an enrichment factor of 1.6. The desalination efficiency and the quality of the as-made water via the hydrate-based process can be further improved to above 99% via three-stage hydrate reaction. The proposed hydrate-based water treatment process may find wide applications in waste water treatment and heavy metal recycling.

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