2024-03-29T16:38:04Z
https://ejchem.journals.ekb.eg/?_action=export&rf=summon&issue=95
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2015
58
1
Chemical Treatment for Removal of Heavy Metals from Industrial Wastewater
THE OBJECTIVE of the present study is the treatment of industrial wastewater that is artificially contaminated with a combination of soluble salts of Ni, Cu, and Mn in the concentration of 10 mg/l each. The treatment is focused on employing chemical coagulants and coagulant aids for the removal and co-precipitation of heavy metals. Variable doses of the chemical coagulants at different pH were examined. The physical and chemical characteristics and the level of Cu, Ni and Mn in the industrial wastewater are given. When Sodium hydroxide was employed at pH 9.5, removal rate reached 97.5, 96.0 and 90.0% for Cu, Ni, and Mn, respectively. On the other hand, the use of 50 mg/l ferric chloride in combination with sodium hydroxide at different pH was studied. At pH 12.0, all the studied metals were removed at the rate of 98%. When 70 mg/l alum was employed in combination with NaOH at different pH, results indicated that 100% of Cu, 100% of Ni and 84% of Mn were removed at pH 12.0. Further study was carried out using lime at different doses. At pH 11.0, the removal rate reached over 100% for Cu and Ni each and 93% for Mn. Limestone (CaCO3) at different doses was investigated. Using 1.0 g/1 limestone raised the pH from 2.0 to 5.85 and the removal of Cu, Ni and Mn reached 100, 90.2 and 75.1% respectively. By increasing the CaCO3 dose to 3.0 g/l, more than 100% of Cu and Ni each was achieved while Mn was removed at 90.6%. It was noticed that increasing the limestone dose up to 5.0 g/l did not increase the pH more than 8.0. This can be attributed mainly to the buffering system of limestone. It was concluded that the precipitation of metals is governed by the solubility product. Since all effluent guidelines require an effluent pH between 6 and 9, the use of carbonate treatment is, therefore, recommended because of its buffering capacity value which is around pH 7. Still, CaO provides substantial precipitation efficiency and an economic mean of treatment. The disadvantage is the difficulty to control the pH of the liquid waste. However, this problem could be overcome by using acid to control the pH if needed.
Heavy metals
Removal
Chemical coagulation
Industrial Wastewater
Precipitation and co-precipitation
copper
Nickel and Manganese
2015
02
28
1
12
https://ejchem.journals.ekb.eg/article_293_34e1785945575a5a584359eabf8d2eb8.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2015
58
1
Preparation and Evaluation of New Heterocyclic Compounds Based on Benzothiophene Derivatives as Antifouling Additives for Marine Paint
Slime-forming bacteria
Microbial fouling
Macrobiofouling
Heterocyclic compounds
Biological activity and Self-polishing paints
2015
02
28
13
41
https://ejchem.journals.ekb.eg/article_988_7e36b123978f946664ffb1d69efc3435.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2015
58
1
Occurrence and Distribution of Aliphatic and Polycyclic Aromatic Hydrocarbons in Surface Waters along Coastal Area of Suez Gulf
ٍSUEZ Gulf is an area of environmental interest due to tourism, Suez port, El-Sukhna beach, shipping activity, petroleum production, and industry activities. Water samples were collected from the coastal area of Suez Gulf, and analyzed in 2014 by Gas Chromatography, HPLC, Ultraviolet, and FT-IR spectroscopy for the spatial distribution and sources of aliphatic n-alkanes and unresolved complex mixture of fossil hydrocarbons. The ratio of UCM to n-alkanes and CPI values in all stations indicates that the main contribution to petroleum hydrocarbon contamination is via oil and its products and 16 parent polycyclic aromatic hydrocarbons, the concentrations ranged from 13.352 to 205398.76 ng/L with a mean value of 52531.578 ng /L, which exceed the maximum admissible concentrations of PAHs 200 ng/L for the water standard of European Union. The total concentrations varied from 4105 to 24229 ng /L for aliphatic hydrocarbons, the highest concentrations of total PAHs were recorded for stations near the Inlet of Suez Oil Petroleum Company (SOPC) and both of EL-Sukhna at Loloh and El-Suez beaches. Interferences of rather petrogenic and pyrolytic PAH contaminations were noticed in different locations in Suez Gulf due to petroleum products deliveries and production as well as fuel combustion emissions from boats and ships. The presences of aliphatic and aromatic hydrocarbons were confirmed by both FT-IR analysis and UV absorption spectra. The concentrations detected at each site were sufficiently high to pose a risk to marine organisms if they are exposed continuously to this concentration. Hence, continuous monitoring of the ecosystem is highly warranted.
Hydrocarbons
PAHs
pollution
Hydrocarbon sources and UV and FT-IR Spectroscopy
2015
03
02
43
69
https://ejchem.journals.ekb.eg/article_1025_418261f857a32ec50733018bae388401.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2015
58
1
Equilibrium Studies of Complex Formation Reactions of [Pd (SMC)(H2O)2] + with Amino Acids, Peptides or DNA Constituent
2015
02
28
71
83
https://ejchem.journals.ekb.eg/article_989_9b874f8d02dda3591d888d9aca715e52.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2015
58
1
High Branched Precursor for Synthesis of Silver Nanoparticles and its Application to Cotton Fabric M.H. El-Rafie, M.K. El-Bisi* and A. Hebeish Textile Research Division, National Research Centre, affiliation ID (60014618), Dokki, Cairo, Egypt. EREIN we present a new green highly branched polymer ….…precursor, namely starch-polyacrylic acid graft copolymer for synthesis of silver nanoparticles (AgNPs) via involvement of the copolymer in dual reduction of Ag+ and stabilizatio
Starch grafted with polyacrylic acid
Silver nanoparticales
antimicrobial activity
Multifunctional of cotton fabric and Smart textiles
2015
02
28
85
95
https://ejchem.journals.ekb.eg/article_990_7f3706a0eceaaaa278437db103c16476.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2015
58
1
Modification of The Physical and Chemical Properties of Formaldehyde by The Addition of The Glass-fiber
2015
02
28
99
111
https://ejchem.journals.ekb.eg/article_991_37f5e594e1119cda33de9ef53926ce36.pdf