Taking a photovoltaic enterprise as an example,a three-stage coupling process of"plate and frame pres-sure filtration+arsenic-iron co-precipitation+activated sand filtration"was designed and applied to the pretreatment of its arsenic wastewater.The technical characteristics of the process were introduced with providing the technical parame-ters of the main structures,the key points of the process control were described and the operation of the system were ana-lyzed.The engineering operation results show that the process can effectively remove the total arsenic,and the effluent sta-bly meets the water quality standard.
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