Zero-discharge treatment process for cement industrial wastewater

Abstract

The invention provides a zero-discharge treatment process for cement industrial wastewater, belongs to the field of industrial plant area wastewater treatment, and mainly solves the problem of pollutant discharge of various types of wastewater and rainwater in a plant area. Waste heat power generation cooling wastewater treatment is taken as a base, and the process comprises the following steps: performing directional chemical precipitation reaction on bicarbonate radical, calcium and magnesium ions in water by multistage dosing, performing efficient inclined tube precipitation, filtering by asintered metal filter element and performing ozone disinfection. Initial rainwater is subjected to inclined tube sedimentation and air floatation oil removal and then is converged into the base system, and mechanical equipment cooling wastewater is subjected to oil removal and then is converged into the base system. The removed oil and organic matters are added into a domestic sewage treatment system, and fluid stirring anaerobic treatment is performed so that the treatment of various wastewater in a plant area is organically combined, the system is simplified, the cost is reduced, and the sufficient and guaranteed cyclic utilization is realized. The processis used for zero-discharge treatment of wastewater in the cement industry and the like.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a zero-discharge treatment process for cement industrial wastewater. Background technique [0002] Generally speaking, the wastewater involved in the cement industry includes raw water treatment wastewater, waste heat power generation cooling wastewater, mechanical equipment cooling wastewater, power generation boiler softened water concentrated salt wastewater, domestic sewage, and initial rainwater. The main pollutant of raw water treatment wastewater is suspended solids. The main waste factor of waste heat power generation wastewater is temporary hardness, and the main waste factor of mechanical equipment cooling wastewater is also temporary hardness, but there are also oil pollutants. Boiler softened water concentrated salt wastewater is waste because of salt content; pollutants in initial rainwater come from logistics avenues and site cleaning, in addition to a large amoun...

Images