Natural biological treatment of wastewaters and agricultural drainage for reuse in irrigation

Wetlands are a cost effective method of treating wastewaters and agricultural drainage for reuse in irrigation. Nevertheless, natural biological system are most effective for the treatments of domestic wastewaters and low salt agricultural drainage. Trace organics and some heavy metals are not readily removed from wastewaters unless the system is designed for long and uneconomical retention times. Workers applying the treated wastewaters should take precautions such as wear gloves, masks and boots. Also, this irrigation water should be applied at ground level or by drip irrigation to limit the levels of aerosols contaminants.