Identification of multi-level toxicity of liquid crystal display wastewater toward Daphnia magna and Moina macrocopa

► Liquid crystal display (LCD) wastewater showed acute toxicity, inhibition of feeding rate and oxidative stress in daphnids. ► Copper is the cause of the multi-level toxicity in LCD effluent. ► An inappropriate dosage of alum coagulant increase toxicity in LCD effluent.