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Effects of pH and coagulant dosage on the removal of turbidity and suspended solids from domestic wastewater using copperas

Effects of pH and coagulant dosage on the removal of turbidity and suspended solids from domestic wastewater using copperas

Hamidi Abdul Aziz1, 2*, Wan Izatul Saadiaah Wan Kamar1, Siti Fatihah Ramli1

HIGHLIGHTS

  • Copperas (FeSO2.7H2O) used as coagulant to treat turbidity and suspended solids in domestic wastewater.
  • The copperas is a by-product of an ilmenite processing industry.
  • The optimum dosage for copperas was 150 mg/L at optimum pH of 9.
  • Copperas can remove 85% turbidity and 90% SS at optimum pH and coagulant dosages.
  • It can be applied to treat other wastewaters such as textile wastewater and industrial wastewater.

ABSTRACT

Treatment of domestic wastewater is essential because the discharge of untreated wastewater may pose serious environmental problems. Physicochemical treatment such as coagulation/flocculation is one of the most applied methods worldwide. Alum and ferric chloride are the most common coagulants used for the treatment of wastewater and industrial effluent. This study investigated the potential use of copperas (FeSO2.7H2O) in removing turbidity and suspended solids from the domestic wastewater. The copperas was taken as a by-product from one of the ilmenite processing industries in Malaysia. The effects of pH and dosage on the removal efficiencies were evaluated in standard jar test experiments. The optimum conditions occurred at copperas dosage of 150 mg/L and pH of 9, with 85% and 90% removal respectively, for turbidity and suspended solids. It can be applied to treat other wastewaters such as tannery wastewater, laundry wastewater, textile wastewater, and industrial effluent.

© 2019 Ababil Publishers. All rights reserved.

To cite this article: Abdul Aziz H, Wan Kamar WIS, Ramli SF. Effects of pH and coagulant dosage on the removal of turbidity and suspended solids from domestic wastewater using copperas. Journal of Desalination and Water Purification 2019;15:7-11.

To link this article: http://ababilpub.com/download/jdwp15-3/

Assessment of a new approach of metal ions chelation by Gallic acid

Assessment of a new approach of metal ions chelation by Gallic acid

F. Boudou1,2,*, M. Bendahmane-Salmi1,2, , M. Benabderrahmane1, A. Belakredar3 , A. Berroukche4, O. Zaoui4

HIGHLIGHTS

  • Gallic acid (3,4,5-trihydroxybenzoic acid) belongs to phenolic acids.
  • Gallic acid is a member of the class of hydroxybenzoic acids.
  • Folin-Ciocalteu assay is used to determine phenolic compounds in food and herbs.
  • Metal chelating activity results from the formation of bonds between two or more atoms.
  • GA can remove toxic metals, e.g. Al, Cd and Pb through chelating process.

ABSTRACT

The complex formation capacity of Gallic acid (GA) was investigated in aqueous solution for three known toxic metal ions, e.g. aluminum (Al), lead (Pb) and cadmium (Cd). The metal chelating activity of GA was determined spectrophotometrically using a new approach, namely Folin-Ciocalteu (FC) assay. This method consists in the measuring of absorbance of the unbound GA remaining from its interaction with the metal ions which allows the deduction of the bounded one. The highest rates of chelating were found at different concentrations such as 66.37±0.017%, 59.36 ±0.044% and 49.71±0.004% for Al, Cd and Pb, respectively. These findings suggested that GA could be an appropriate mean to remove toxic metals such as Al, Cd and Pb through chelating process.

© 2019 Ababil Publishers. All rights reserved.

To cite this article: Boudou F, Bendahmane-Salmi M, Benabderrahmane M, Belakredar A, Berroukche A, Zaoui O. Assessment of a new approach of metal ions chelation by Gallic acid. Journal of Desalination and Water Purification 2019;15:3-6.

To link this article: http://ababilpub.com/download/jdwp15-2/

Efficiency enhancement in humidification and dehumidification desalination

Efficiency enhancement in humidification and dehumidification desalination

K. Srithar

Fresh water is an important natural resource for the survival of most living things. The fresh water is needed not only for the essential function of life but also for the process treatments in domestic, agricultural and industrial sectors in large quantity. Nature produces the needed fresh water through the hydrological cycle. More than two third of the earth surface is covered with the water. About 97% of water is available in ocean as salt water and the remaining 3% as fresh water. And nearly 70% of fresh water is exists frozen in glaciers, permafrost, ice and permanent snow cover, about 29.75% is available underground and the remaining 0.25% of fresh water is available in the water bodies like lakes and rivers. The global warming in many areas reduces the fresh water availability. In addition to this, increase in population and rapid growth of industries inflates the fresh water demand. Further uneven distribution of fresh water is another major problem for the water scarcity. Water scarcity and sanitation problem is given as top priority by the United Nations Organization due to the following reasons: The water table level of subsurface in all the continents of the world is shrinking and the agricultural lands gradually become saline…

© 2019 Ababil Publishers. All rights reserved.

To cite this article: Srithar K. Efficiency enhancement in humidification and dehumidification desalination. Journal of Desalination and Water Purification 2019;15:1-2.

To link this article: http://ababilpub.com/download/jdwp15-1/