Recycling method for high-hardness high-salinity recycled paper paper-making wastewater

Abstract

The invention discloses a recycling method for high-hardness high-salinity recycled paper paper-making wastewater. Firstly, pre-softening treatment is carried out on high-hardness wastewater by usinglime powder, and efficient interception is carried out on divalent ions and multivalent ions in the wastewater by using a membrane separation method to remove calcium, magnesium, silicon, sulfate radical and other ions. In the process of using the membrane separation method, the characteristics of the ions in the wastewater are changed by using an electromagnetic method, thereby changing deposition speed of calcium carbonate and physical characteristics of deposition to prevent the formation of hard scale so as to greatly reduce the possibility of the scale formation, the separation effect isgood, the inner treated sewage is recycled, the purification treatment pressure of the sewage is reduced, the out-emission of the sewage is reduced, and the production process is cleaner and more environmentally-friendly.

Description

technical field

[0001] The invention relates to the field of papermaking wastewater treatment, in particular to a recycling method for recycled papermaking wastewater with high hardness and high salinity. Background technique

[0002] Wastewater produced in the industrial production process of waste paper and paper usually contains higher hardness and higher salt content. Higher hardness mainly refers to the high total concentration of calcium and magnesium ions in the sewage. Because its color is black and Often referred to as black liquor, if the black liquor is discharged directly without treatment, it will cause salinization of water and soil and endanger the natural environment.

[0003] At present, the softening methods for black liquor mainly include chemical methods and ion exchange methods. Chemical methods are the most common in the practical application of various high-salt wastewater to remove calcium and magnesium. The main mechanism is to add certain chemical a...

Examples

Embodiment Construction

[0036] The following descriptions are only preferred embodiments of the present invention, and do not limit the scope of protection of the present invention.

[0037] A method for recycling high-hardness and high-salinity recycled paper papermaking wastewater, comprising the following steps:

[0038] 1) The impurity removal treatment step is to perform an impurity removal treatment on the high hardness and high salinity wastewater to remove the solid particle impurities therein, and the impurity removal treatment selects a sand filtration treatment method, a multimedia filtration treatment method, a flocculation treatment method or a clarification treatment method.

[0039] 2) In the pre-softening wastewater step, the high-hardness and high-salinity wastewater is transported to the rapid stirring tank through the wastewater delivery pipeline, and a set alternating electric field or alternating magnetic field is added to the wastewater delivery pipeline in the nanofiltration sep...

technical field

[0001] The invention relates to the field of papermaking wastewater treatment, in particular to a recycling method for recycled papermaking wastewater with high hardness and high salinity. Background technique

[0002] Wastewater produced in the industrial production process of waste paper and paper usually contains higher hardness and higher salt content. Higher hardness mainly refers to the high total concentration of calcium and magnesium ions in the sewage. Because its color is black and Often referred to as black liquor, if the black liquor is discharged directly without treatment, it will cause salinization of water and soil and endanger the natural environment.

[0003] At present, the softening methods for black liquor mainly include chemical methods and ion exchange methods. Chemical methods are the most common in the practical application of various high-salt wastewater to remove calcium and magnesium. The main mechanism is to add certain chemical a...

Examples

Embodiment Construction

[0036] The following descriptions are only preferred embodiments of the present invention, and do not limit the scope of protection of the present invention.

[0037] A method for recycling high-hardness and high-salinity recycled paper papermaking wastewater, comprising the following steps:

[0038] 1) The impurity removal treatment step is to perform an impurity removal treatment on the high hardness and high salinity wastewater to remove the solid particle impurities therein, and the impurity removal treatment selects a sand filtration treatment method, a multimedia filtration treatment method, a flocculation treatment method or a clarification treatment method.

[0039] 2) In the pre-softening wastewater step, the high-hardness and high-salinity wastewater is transported to the rapid stirring tank through the wastewater delivery pipeline, and a set alternating electric field or alternating magnetic field is added to the wastewater delivery pipeline in the nanofiltration sep...