Treatment of tannery effluents by surface adsorption

Abstract

A promising technique emphasised in the proposed tannery waste treatment system is surface adsorption. Specific surface adsorption processes studied were foam separation without additives, adsorbing colloid flotation, carbon adsorption, and adsorption flotation. Results show that foam separation without additives is not a feasible process for the removal of either dissolved organics or suspended solids from tannery wastes. Adsorbing colloid flotation is feasible for the primary treatment of tannery wastes, provided that dimethyldihydrogenated-tallow ammonium chloride or the like is used as a collector. Secondary treatment of tannery effluent by carbon adsorption alone is not sufficient. However, by combining carbon adsorption and flotation into a single process (adsorption flotation) a high fractional removal of both dissolved and suspended pollutants can be achieved.

Removal of chromium(III) from tannery wastewater using activated carbon from sugar industrial waste

“…Removal of metals from wastewater is achieved principally by the application of several processes such as adsorption [6], sedimentation [7] electrochemical processes [8,9], ion exchange [10], biological operations [11], cementation [12], coagulation/flocculation [13], filtration and membrane processes [14,15], chemical precipitation and solvent extraction [16,17]. Cost-effective alternative technologies or adsorbents for the treatment of metal-containing wastewaters are needed.…”

CHAPTER 12. Heavy Metals in Tannery Wastewater and Sludge: Environmental Concerns and Future Challenges

“…Removal of metals from tannery wastewater is achieved by the application of several processes, such as chemically assisted sedimentation, 8,9 coagulation/ flocculation, 10 electrochemical processes, 11,12 ion exchange, 13 adsorption, [14][15][16][17] filtration and membrane processes 7 and their combinations. 18 The coagulation-flocculation (CF) process, generally using inorganic coagulants such as aluminium sulfate (alum), ferric chloride (FeCl 3 ) or ferrous sulfate (FeSO 4 ), has been applied to leather tanning wastewater to reduce the organic load and suspended solids in addition to removing chromium before biological treatment.…”

Adsorption of Chromium From Tannery Wastewater by Surface Response Method

“…The literature review reveals that a number of different methods are available for the removal of metals from wastewater using processes such as adsorption (Wang, Dahm, & Baier, ), sedimentation (Song, Williams, & Edyvean, ), electrochemical processes (Oda & Nakagawa, ; Vlyssides & Israelites, ), ion exchange (Tiravanti, Petruzzelli, & Passino, ), biological operations (Kapoora, Viraraghavana, & Cullimoreb, ), cementation (Filibeli, Buyukkamaci, & Senol, ), coagulation/flocculation (Song, Williamsm, & Edyvean, ), filtration and membrane processes (Hafez, El‐Manharawy, & Khedr, ; Fabianil, Rusciol, Spadonil, & Pizzichini, ), and chemical precipitation and solvent extraction (Brooks, ; Macchi, Pagano, Pettine, Santrori, & Tiravanti, ). However, for economic reasons, tanneries do not want to invest in treatment technologies or operations.…”