Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for advanced treatment and recycle of papermaking wastewater

A technology for papermaking wastewater and advanced treatment, which is applied in processing wastewater treatment, adsorption water/sewage treatment, ion exchange water/sewage treatment, etc., and can solve the problems of complex equipment, difficult application and unsatisfactory treatment effect.

Active Publication Date: 2012-03-14
NANJING UNIV +1
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of complex equipment, high investment and operating costs, treatment effects that do not meet new discharge standards, and inability to reuse existing papermaking wastewater advanced treatment methods, the present invention utilizes the joint application of strong alkali and weak acid magnetic microsphere resins to remove The residual organic and inorganic substances in the biochemical tail water of the papermaking wastewater make the main pollutant indicators of the treated wastewater meet the Class IV water standard specified in the Surface Water Environmental Quality Standard (GB3838) or the papermaking water quality standard before being reused in the papermaking process In order to solve the application difficulties of resin technology in the treatment of large volumes of tail water

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 10 tons of biochemical tail water (COD 150mg / l, color 92 times, hardness 800mg / l) from the wastewater treatment station of a large pulp and paper company were pumped to the steel reaction tank (0.4m 3 ) reaction, the reaction tank adopts mechanical stirring (input power l00w / m 3 wastewater). The mixed resin (weak acid resin: magnetic anion exchange resin = 1:20) is pumped to the reaction tank, and the resin dosage is 1L / h. The effluent from the reaction tank (including resin and waste water) flows into the steel sedimentation tank by itself, and the processing load of the sedimentation tank is 0.8m 3 / (m 2 / h), the resin is precipitated in the sedimentation tank, and the treated wastewater (COD 30mg / l, color 8 times) flows out of the sedimentation tank from the upper part of the sedimentation tank.

[0023] The resin precipitated in the lower part of the sedimentation tank is transported to the reaction tank and the desorption tank at a ratio of 80% and 20% respect...

Embodiment 2

[0025] Put 1L of biochemical tail water (COD 135mg / l, chroma 75 times, hardness 250mg / l) into a beaker, add 2.5mL mixed resin (weak acid resin: magnetic anion exchange resin=1: 50), at 20°C, stir for 20 minutes. After the completion of the reaction, let it stand for 10 minutes. After being adsorbed by the magnetic mixed resin, the COD of the upper effluent is 25mg / l, the chroma is 2 times, the hardness is 50mg / l, the COD removal rate is 81.5%, the chroma removal rate is 96%, and the hardness is removed. The rate is 80.0%.

[0026] At room temperature, the precipitated magnetic hybrid resin was regenerated with 5mL regeneration solution containing 10% NaCl and 0.1% HCl, and the desorption rate of COD and hardness was greater than 95%.

[0027] The above biochemical tail water (COD is 135mg / l, chromaticity 75 times, hardness 250mg / l) IL is put into a beaker, add 2.5mL magnetic anion exchange resin, and stir for 20min at 20°C. After the completion of the reaction, let it s...

Embodiment 3

[0030] Put 1L of biochemical tail water (COD 178mg / l, chroma 105 times, hardness 940mg / l) of a sewage plant in a large wood pulp and paper making park after biochemical treatment into a beaker, add 7mL magnetic mixed resin (magnetic weak acid resin: Magnetic anion exchange resin = 1:7), at 25°C, stir and react for 40min. After the completion of the reaction, let it stand for 10 minutes. After being adsorbed by the magnetic powder resin, the COD of the upper layer effluent is 25mg / l, the chroma is 7 times, the hardness is 210mg / l, the COD removal rate is 80.3%, the chroma removal rate is 93.3%, and the hardness removal rate is 80.3%. The rate is 77.6%.

[0031] At room temperature, the precipitated magnetic hybrid resin was regenerated with 10mL regeneration solution containing 10% NaCl and 0.1% HCl, and the desorption rate of COD and hardness was greater than 95%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for advanced treatment and recycle of papermaking wastewater, belonging to the field of papermaking wastewater. The method comprises the following steps of: fully mixing and continuously reacting the papermaking wastewater treated by adopting a biotechnology with magnetic anion exchange resin in a reactor or fully mixing and continuously reacting several kinds of anion exchange resins with magnetic weak acid; settling and separating the fully-mixed and adsorbed wastewater in a settling tank and conveying the settled and separated resin to the interior of a desorption tank; adsorbing the settled and separated resin with a desorption liquid containing an inorganic desorbent in the desorption tank under the condition of normal temperature; and after the resinis desorbed each time, cleaning the residual desorbent with water and then conveying the cleaned water to the reactor for recycling. The treated wastewater meets IV water standard specified by the environment quality standard (GB3838) of surface water and can be recycled, so that the quantity reduction and the recycling of the papermaking wastewater are realized. The invention has the advantages of simple process, low operation cost and favorable treatment effect; and the treatment process for a traditional biochemical treatment system can be simply reformed.

Description

technical field [0001] The method for advanced treatment and reuse of biochemical tail water of papermaking wastewater, more specifically, refers to a method for advanced treatment and reuse of biochemical tail water of papermaking wastewater by using magnetic anion exchange resin or magnetic weak acid and magnetic anion exchange resin. Background technique [0002] The paper industry is one of the industries with high energy consumption and material consumption and serious environmental pollution. Its pollution characteristics are large waste water discharge, high content of COD and suspended solids (SS), serious chroma, and high hardness content. After biochemical treatment , due to changes in water quantity and quality and biochemical refractoriness, quite a few cannot meet the discharge standards. At the same time, the paper industry is a high water consumption industry, and water conservation is an important issue in this industry. Therefore, it is necessary to carry o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F1/28C02F103/28
Inventor 李爱民史小雪范俊张海云双陈冬王文文
Owner NANJING UNIV