Abstract: A metal surface treatment liquid recycling system includes a treatment liquid collecting tank, a pre-treatment device, a nanofiltration device and a vacuum distillation device, all of which are connected sequentially. The nanofiltration device includes a feed tank, a first-stage nanofiltration membrane unit, and a second-stage nanofiltration membrane unit. Treatment wastewater in the treatment liquid collecting tank is fed into the pre-treatment device to filter out suspended solids and then enter the feed tank. The wastewater in the feed tank is filtered by the first-stage nanofiltration membrane unit and transformed to a first-stage concentrated waste liquid and first-stage infiltration fluids. The first-stage infiltration fluids are fed into and re-filtered by the second-stage nanofiltration membrane unit and transformed to a second-stage concentrated waste liquid and second-stage infiltration fluids.

Abstract: A steam heating type sewage treatment device includes: a treatment tank connected to a sewage supply pipe, a stirring device disposed in the treatment tank; a steam heating device disposed on an outer surface of the treatment tank; a vacuuming device fixed to a top of the treatment tank and connected to the treatment tank via a first connecting pipe; a heating device connected to the treatment tank by a second connecting pipe and connected to a steam storage tank by a third connecting pipe, and a fourth connecting pipe connected between the steam input pipe and the steam storage tank to recycle the steam. The heating device pressurizes or heats the steam entering the vacuuming device and the connecting pipes, and the heated steam is guided by pipes into the steam heating device, thus achieving the effect of steam recycling.

Abstract: A steam heating type sewage treatment device includes: a treatment tank connected to a sewage supply pipe, a stirring device disposed in the treatment tank; a steam heating device disposed on an outer surface of the treatment tank; a vacuuming device fixed to a top of the treatment tank and connected to the treatment tank via a first connecting pipe; a heating device connected to the treatment tank by a second connecting pipe and connected to a steam storage tank by a third connecting pipe, and a fourth connecting pipe connected between the steam input pipe and the steam storage tank to recycle the steam. The heating device pressurizes or heats the steam entering the vacuuming device and the connecting pipes, and the heated steam is guided by pipes into the steam heating device, thus achieving the effect of steam recycling.