عنوان مقاله [English]
There is an increasing concern over environmental pollutions, because over the course of the recent decades, human activities have led to an increase in environmental pollution. Heavy metals are some of these pollutants. Among the heavy metals lead, chrome and arsenic are more toxic to human. Up-taking of heavy metals from water or food chain may cause various disorders in human. Because of heavy metals toxicity for environment and human, they are considered as important environmental pollutants. These pollutants due to the non-biodegradable, high toxicity, high cumulative effects are regarded custodians of health of the society. Heavy metals are systemic poisons and by specific effect on the nerves, carcinogenesis can cause death. These poison by disrupting in mental and nervous system and interfere with neurotransmitters and effects on cardiovascular, immune system can cause horrible effects on human health. The aim of this study was to determine the health and environmental effects of heavy metals with emphasis on cadmium, lead and arsenic. To do this review study, previous research conducted by the authors and review of texts from other authoritative scientific sources have been used. Due to the destructive and harmful effects of toxic elements of heavy metals on humans and other living organisms, their removal from wastewater is inevitable. For this reason, in order to implement the regulations, it is necessary that before discharging sewage into the environment, their heavy metals must be treated to the standard limit.