Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method and device for concentrating and reclaiming low-concentration industrial waste acid water

A technology of industrial waste acid and recovery method, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, heating water/sewage treatment, etc., can solve the problems of large lime consumption, secondary pollution, and large energy consumption, and achieve Reduce operating costs, create economic benefits, and achieve high concentration efficiency

Inactive Publication Date: 2009-12-16
TIANJIN LANHAIJINGYUAN ENVIRONMENTAL PROTECTION TECH
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively low concentration of discharged waste acid, it cannot be directly used in production, and needs to be concentrated before use. However, the current concentration method of dilute acid generally consumes a lot of energy
Most enterprises mainly adopt the method of adding lime to neutralize the acid and then discharge it, which consumes a lot of lime and produces a large amount of sludge, causing secondary pollution

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for concentrating and reclaiming low-concentration industrial waste acid water
  • Method and device for concentrating and reclaiming low-concentration industrial waste acid water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1. See figure 1 :

[0014] A method for concentrating and recovering low-concentration waste acid water, comprising the steps of:

[0015] (1) Pretreatment of waste acid water: first use the aeration method to separate out the difficult-to-remove substances dissolved in the wastewater, and then remove the macromolecular substances in the water through a high-efficiency fiber filter;

[0016] (2) Osmotic distillation: the waste acid water treated in step (1) enters the osmotic distillation membrane module, and on one side of the osmotic distillation membrane module is the waste acid water treated in step (1). The other side is an aqueous solution containing a removal agent. The removal agent is an inorganic salt solution with a relatively low osmotic activity. In this example, magnesium chloride is selected with a concentration of 34%. Carry out osmotic distillation dehydration at 20°C, and after osmotic distillation dehydration and concentration The concentrat...

Embodiment 2

[0022] The basic content is the same as in Example 1, the difference is that the removal agent is magnesium sulfate, the concentration is 25%, and the osmotic distillation dehydration is carried out at 25°C; the concentration of waste hydrochloric acid is increased from 2% to 17% after osmotic distillation dehydration concentration, and the osmotic distillation The modular design of the distillation membrane module system, the number of membrane modules is designed according to the amount of water to be treated, that is, when the processing capacity increases, the processing capacity can be improved by adding membrane modules, the addition of membrane modules is simple, and the equipment occupies less land. Size, flexible installation; while the traditional enrichment equipment occupies a large area, once the equipment is confirmed, the processing capacity is fixed, and the processing capacity can only be increased by adding new equipment, which requires a large investment. The...

Embodiment 3

[0024] The basic content is the same as in Example 1, the difference is that the removal agent is calcium chloride, and the concentration is 32%, and dehydration is carried out at 27° C.; the concentration of waste hydrochloric acid is increased from 5% to 21% after concentration through osmotic distillation dehydration. The modular design of the osmotic distillation membrane module system, the number of membrane modules is designed according to the amount of water to be treated, that is, when the processing capacity increases, the processing capacity can be improved by adding membrane modules, the addition of membrane modules is simple, and the equipment occupies less land. According to The size of the site allows flexible installation; while traditional enrichment equipment occupies a large area, once the equipment is confirmed, the processing capacity is fixed, and the processing capacity can only be increased by adding new equipment, which requires a large investment. The c...

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
Membrane pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for concentrating and reclaiming low-concentration industrial waste acid water, which comprises the following steps: (1) pretreatment of waste acid water, namely firstly, separating out substances which are difficult in removing and are dissolved in the waste water by adopting an aeration method, and then filtering macromolecular substances in the water by adopting an efficient fiber filter; (2) osmotic distillation, namely feeding the waste acid water treated in step (1) into an osmotic distillation membrane component, and putting water solution containing a removing agent at the other side of the osmotic distillation membrane component, wherein the removing agent selects the brine solution with comparatively low osmotic activity, the concentration of the brine solution is generally 25 to 43 percent, and the osmotic distillation and dehydration are carried out at between 20 and 30 DEG C; (3) evaporating and concentrating the removing agent, namely evaporating and concentrating the diluted removing agent obtained in step (2), and recycling the removing agent; and (4) purification treatment of concentrated acid water, namely filtering the concentrated acid water through a strong acid resistant nano-filtration membrane component to remove impurities such as iron ions in the acid water.

Description

technical field [0001] The invention belongs to the technical field of recycling and utilization of industrial waste water, in particular to a method and device for concentrating and recycling low-concentration industrial waste acid water. Background technique [0002] my country discharges a huge amount of waste acid every year, involving many industries. Such as dilute hydrochloric acid formed in the production of chlor-alkali industry, dilute sulfuric acid and dilute hydrochloric acid produced in the steel pickling process, dilute hydrochloric acid produced in the production of chlorinated polyethylene, dilute sulfuric acid produced in the production process of sulfuric acid titanium dioxide, etc. The discharge of waste acid is huge. Taking the production of titanium dioxide by sulfuric acid method as an example, 8-10 tons of 20% waste acid will be produced for every ton of titanium dioxide produced. Due to the relatively low concentration of discharged waste acid, it ca...

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
IPC IPC(8): C02F9/10C02F1/44C02F1/04
Inventor 史玉梅齐丽环
Owner TIANJIN LANHAIJINGYUAN ENVIRONMENTAL PROTECTION TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com