Wastewater purification process in incineration furnace slag treatment process

Abstract

The invention provides a wastewater purification process in an incineration furnace slag treatment process. The wastewater purification process comprises the following steps: oil stain removal by an air flotation method, pH value adjustment treatment, chemical precipitation treatment and filtration treatment, layer filtration treatment, cyclic concentration treatment, centrifugal filtration treatment, nanofiltration treatment, heavy metal recapture treatment, magnetic metal separation treatment and gravity metal reselection treatment. According to the process, the oil stain in the wastewater is effectively removed by removing the oil stain through an air flotation method; in cooperation with activated carbon adsorption filtration in subsequent layer filtration treatment, oil stains in thewastewater can be completely removed; large-particle heavy metal precipitates contained in the wastewater can be filtered through pH value regulation treatment, chemical precipitation treatment and filtration treatment; micromolecular heavy metals contained in the wastewater can be removed through centrifugal filtration treatment, ultrafiltration membrane treatment, nanofiltration treatment and heavy metal recapture treatment, the treated wastewater can reach the discharge standard, wastewater purification treatment can be performed without using more sites, and site resources are effectivelysaved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a wastewater purification process in the process of treating incinerator slag. Background technique [0002] With the rapid development of the economy and the improvement of people's living standards, domestic garbage has increased sharply, spreading from the city to the vast countryside, threatening the living environment of human beings more and more. urgent problems that need to be addressed. [0003] At present, people's treatment of domestic waste has gradually changed from primary treatment methods such as field stacking and simple landfills to advanced treatment methods such as composting fermentation, incineration for power generation, and resource recovery, especially because the sites that can be used for garbage dumping Limited, the cost of landfill increases, and the incineration and comprehensive utilization of waste have received more and more attention. T...

AI Technical Summary

Problems solved by technology

The slag produced after garbage incineration can be used as the raw material for making unburned bricks, but first, multi-stage treatment of the slag is required before it can be used to prepare unburned bricks. These processes will use a lot of water resources and produce more wastewater, which contains more heavy metal substances. If the wastewater is not further purified, it will cause secondary pollution.