Methods for electronic wastewater treatment at an ultra-low concentration of contaminants adapting microfiltration membrane bioreactor process and selective heavy metal removal process

摘要

The present invention relates to a process for separating suspended solids and microbial sludge by treating organic matter, suspended solids, nitrogen, and phosphorus in a microfiltration membrane bioreactor, and preventing heavy metals from interfering with the reaction of the heavy metal scavenger in subsequent steps, The present invention relates to a method for treating contaminants in electronic wastewater at a low concentration by applying a microfiltration membrane bioreaction process and a selective heavy metal removal process. A preferred embodiment of the present invention is a method for treating wastewater containing organic matter, nitrogen, phosphorus, and heavy metals in a process of treating electronic wastewater, comprising the steps of: (a) collecting generated wastewater into a flow rate control tank; (b) removing the organic matter, nitrogen and phosphorus from the wastewater supplied from the flow rate adjusting tank through the biological treatment tank consisting of an aerobic tank, anoxic tank and aerobic tank with a microfiltration membrane; (c) mixing wastewater treated in the biological treatment tank with a heavy metal removal agent in a heavy metal treatment tank to remove heavy metals; (d) treating the wastewater treated in the heavy metal treatment tank with sludge in a sludge settling tank to treat sludge and discharging treated water from which sludge has been removed; (e) treating the sludge settling tank with the sludge-depleted treated water through the sand filter and the activated carbon filter in order, and then discharging the treated water and the fine suspended material and the dissolved substance.