Wastewater generated at a small hair care products company
was highly toxic to the aquatic organisms D. similis, C. dubia and
P. subcapitata. The physicochemical wastewater treatment system
presented low overall efficiency and treated effluent presented elevated
toxicity. The results of TIE phase I indicated non or moderately
polar organic and volatile or sublatable compounds as primarily
responsible for whole effluent toxicity, while ammonia, cationic
metals and oxidants were eliminated as possible sources of toxicity.
The properties associated with toxicity correlated with the physical
and chemical parameters (BOD5, COD, total suspended solids
and surfactants) in the treated wastewater that exceeded effluent
discharge limits. Surfactants used in the company’s production
processes presented high toxicity to P. subcapitata, and these were
considered the main source of wastewater toxicity.
Wastewater generated at a small hair care products company
was highly toxic to the aquatic organisms D. similis, C. dubia and
P. subcapitata. The physicochemical wastewater treatment system
presented low overall efficiency and treated effluent presented elevated
toxicity. The results of TIE phase I indicated non or moderately
polar organic and volatile or sublatable compounds as primarily
responsible for whole effluent toxicity, while ammonia, cationic
metals and oxidants were eliminated as possible sources of toxicity.
The properties associated with toxicity correlated with the physical
and chemical parameters (BOD5, COD, total suspended solids
and surfactants) in the treated wastewater that exceeded effluent
discharge limits. Surfactants used in the company’s production
processes presented high toxicity to P. subcapitata, and these were
considered the main source of wastewater toxicity.
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