Heavy metal waste water treatment process and apparatus

Abstract

The invention relates to a heavy metal wastewater treatment process, comprising the following continuous steps of: pretreatment, solid-liquid separation treatment and filtration treatment, wherein, the filtration treatment means the preliminary filtration, positive ion adsorption treatment and negative ion adsorption treatment to supernatant obtained in the pretreatment step sequentially, the positive ion adsorption treatment adopts a medium of activated zeolite, and the negative ion adsorption treatment adopts a medium of active carbon. Correspondingly, a filtering device applied in an apparatus of the process includes a preliminary filter, an activated zeolite positive ion adsorber and an active carbon negative ion adsorber sequentially communicated with one another. Compared with the prior art, the heavy metal wastewater treatment process and the apparatus can recover the reclaimed water for producing domestic and production water, on the one hand, the treatment process costs are greatly saved, medium and small-sized enterprises can also afford to the process and apparatus, and the application range is broader; and on the other hand, the treatment capacity in unit time is larger, and the recovery rate of reclaimed water is higher.

Description

technical field [0001] The invention mainly relates to a heavy metal wastewater treatment process and a device thereof, in particular to a heavy metal wastewater treatment process and a device capable of reclaiming reclaimed water for production and domestic water. Background technique [0002] The existing reclaimed water treatment method of heavy metal wastewater generally includes the following steps: [0003] 1) Pretreatment: Add heavy metal wastewater to the pretreatment device, adjust the pH of the wastewater to a certain value (this value is related to the flocculant used), and then add an appropriate flocculant to it, and separate the obtained supernatant and fallout; [0004] 2) Solid-liquid separation: The sediment obtained in step (1) is sent to a solid-liquid separation device (also known as a metal residue collection device) connected to one end of the pretreatment device. The general solid-liquid separation device is a plate and frame filter press, Press filt...

AI Technical Summary

Problems solved by technology

[0008] However, the cost of ultrafiltration membranes and reverse osmosis membranes is relatively high, especially reverse osmosis membranes, and after a period of treatment, the membrane pores are easily blocked and become invalid. After failure, ultrafiltration membranes and reverse osmosis membranes cannot be regenerated and need to be replaced. Large-scale enterprises have such economic strength, and small and medium-sized enterprises generally can only use direct discharge or only primary filtration and ultrafiltration, and use the obtained water for secondary washing after roughening on the production line (such as secondary washing after copper plating out of the tank). Road washing) or toilet flushing, greening and other miscellaneous purposes

In addition, although ultrafiltration membranes and reverse osmosis membranes have good treatment effects, due to the small pore size of the membranes, the treatment speed will be relatively slow, and the treatment capacity per unit time is generally not too large (generally, each osmosis membrane treats wastewater per hour The amount does not exceed 0.45m 3 ), the recovery rate of reclaimed water is not high