Process for treating high-concentration dyeing waste water

Abstract

The invention discloses a disposing method of high-density printing and dyeing waste water, which comprises the following steps: (1) removing impurity in the dye waste water through retainer; sending the waste water in the coagulation basin; (2) flowing (or stirring) to add magnetofluid at 320mg / L; flocculating; (3) flowing through magnetic sedimenting pool for 2-5 min to finish sedimenting; (4) overflowing supernatant; filtering sedimentation; pressing. The invention can finish disposal within 10 min, which removes CODCr by 75-80 percent, SS by over 80 percent and chromaticity by over 95 percent in once disposal course.

Description

technical field [0001] The invention relates to a new method for treating high-concentration printing and dyeing wastewater. Background technique [0002] The textile industry is one of the traditional pillar industries of our country. It has a development history of more than a century and is one of the oldest industries in our national industry. my country is the largest country in textile printing and dyeing, but the textile printing and dyeing industry is also a major player in industrial wastewater discharge, accounting for about 35% of the entire industrial wastewater discharge. According to incomplete statistics, the discharge of printing and dyeing wastewater in my country is about 3×106~4×106m3 per day, and printing and dyeing factories will produce 3~5t of wastewater per 100m of fabric processed. The resulting ecological damage and economic losses are immeasurable. To realize the sustainable development of the printing and dyeing industry, we must first solve the p...

AI Technical Summary

Problems solved by technology

[0005] (1) The amount of wastewater is large, generally up to 70% to 90% of the water consumption of printing and dyeing wastewater factories;

[0006] (2) Its components are complex, mainly based on aromatic hydrocarbons and heterocyclic compounds, with color-developing and polar groups; dye molecules contain more hydrophilic groups that can form hydrogen bonds with water molecules, Such as reactive dyes and neutral dyes, etc., dye molecules can be completely dissolved in wastewater; dye molecules containing no or less hydrophilic groups exist in wastewater in the form of hydrophobic suspended particles; Dye molecules that are very large or do not contain hydrophilic groups at all, often exist in the form of colloids in water, and often contain some dyeing auxiliaries in printing and dyeing wastewater

[0007] (3) Wastewater has high chroma, high chemical oxygen demand (COD), and relatively small biochemical oxygen demand (BOD), with poor biodegradability

[0009] (5) Water temperature and water volume vary greatly. Due to changes in processing varieties and output, water temperature and water volume can vary greatly, while the quality of printing and dyeing wastewater varies with raw materials, production varieties, production processes, and management levels;

Although there are many researches in this area at home and abroad and various treatment technologies have been proposed, some of them have low treatment efficiency in practical application, some processes are too complicated, and some even produce secondary pollution, which cannot reach the goal of comprehensively purifying sewage. Purpose