Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Electric coalescence enhanced nano adsorption precipitation sewage treatment method

A sewage treatment method and nano-adsorption technology, applied in the direction of sedimentation treatment, water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of frequent backwashing and regeneration of the filtration system, failure to separate and remove pollutants, and easy clogging and filtration System and other problems, to achieve the effect of high promotion and application value, small dosage of chemicals, and high processing efficiency

Active Publication Date: 2020-01-21
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
View PDF15 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrated metal oxide nanoparticles are difficult to be directly applied to sewage treatment, which mainly has the following problems: ①The particle size of hydrated metal oxide nanoparticles is small, and it is easy to be lost with water during sewage treatment, which makes the adsorption pollution The hydrated metal oxide nanoparticles of pollutants are not easy to precipitate and separate, and the purpose of separating and removing pollutants in water cannot be achieved.
②The hydrated metal oxide nanoparticles added in the sewage treatment process are easy to block the filter system at the back end, rapidly increasing the head loss, resulting in frequent backwashing and regeneration of the filter system
③ A small amount of nanoparticles may remain in the treated water, which may affect ecological security after discharge

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
  • Electric coalescence enhanced nano adsorption precipitation sewage treatment method
  • Electric coalescence enhanced nano adsorption precipitation sewage treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0032] (1) In step A, the hydrated metal oxide nanoparticles are at least one of hydrated iron oxide nanoparticles, hydrated manganese oxide nanoparticles or hydrated iron manganese oxide nanoparticles. The particle diameter of the hydrated metal oxide nanoparticles is below 200 nanometers; the dosage of the hydrated metal oxide nanoparticles is less than 250 mg / L. FeCl 3 The dosage is less than 50mg / L. The reaction time of nano-adsorption is 15-30 minutes.

[0033] (2) In step B, the anode plate and the cathode plate of the electric coalescence reactor are both made of metal titanium electrodes, the working current is direct current, the working voltage is 5-10V, and the reaction time is 5-10 minutes.

[0034] (3) In step C, the precipitation reactor adopts the method of inclined plate precipitation, and the hydraulic retention time is 1-2 hours.

[0035] (4) In step D, the electrocoalescence operation for a certain period of time usually refers to the continuous operation...

Embodiment 1

[0045] The water quality of a certain arsenic-containing sewage is shown in Table 1 below:

[0046] Table 1

[0047] serial number index value 1 pH value 4～5 2 Total salt content (mg / L) 2300～3000 3 Arsenic (mg / L) 0.53

[0048] The arsenic-containing sewage is treated by using the electric coalescence enhanced nano-adsorption precipitation sewage treatment method provided by the present invention, which may specifically include the following steps:

[0049] Step A, nano-adsorption: add NaOH solution with a concentration of 5% to the sewage, adjust the pH value of the sewage to 7, and then add hydrated iron oxide nanoparticles (HFO) and FeCl to the sewage 3 , the average particle size of hydrated iron oxide nanoparticles is 173nm, the dosage of hydrated iron oxide nanoparticles is 65mg / L, FeCl 3 The dosage is 20-50mg / L, and then stirred and reacted for 15 minutes, so that the pollutants in the sewage are adsorbed on the hydrated metal oxi...

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
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses an electric coalescence enhanced nano-adsorption precipitation sewage treatment method which comprises: a nano-adsorption step, namely a step of regulating the pH value of sewage to 6-8, and adding hydrated metal oxide nanoparticles and FeCl3 into the sewage to adsorb pollutants in the sewage onto the hydrated metal oxide nanoparticles; an electric coalescence step, namelya step of introducing the sewage subjected to nano-adsorption into an electric coalescence reactor, and carrying out electric coalescence under the condition of a low-voltage direct-current electric field, so that hydrated metal oxide nanoparticles adsorbing the pollutants are mutually agglomerated to form hydrated metal oxide nano-particle clusters with an increased size because of coalescence; and a precipitation step, namely a step of introducing the sewage subjected to electric coalescence into a precipitation reactor to precipitate the hydrated metal oxide nanoparticle clusters, thereby implementing separation and removal of pollutants in the sewage. According to the method, the hydrated metal oxide nanoparticles adsorbing the pollutants can be easily precipitated and separated, the pollutants in the water can be efficiently removed, and the method has the advantages of a small medicament dosage, a high treatment efficiency, a small sludge generation amount and a high reaction speed.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an electric coalescence enhanced nano-adsorption precipitation sewage treatment method. Background technique [0002] Hydrated metal oxide nanoparticles have a strong adsorption effect on many types of pollutants in water. Existing studies have shown that nanoparticles of metal oxides such as nano-hydrated iron oxide, nano-hydrated manganese oxide, and nano-iron-manganese composite metal oxide have high adsorption capacity for various pollutants such as arsenic, phosphorus, mercury, and thallium in water. It has high application potential for deep removal of pollutants. However, hydrated metal oxide nanoparticles are difficult to be directly applied to sewage treatment, which mainly has the following problems: ①The particle size of hydrated metal oxide nanoparticles is small, and it is easy to be lost with water in the process of sewage treatment, which makes the adsorption pollu...

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): C02F9/12C02F101/20
CPCC02F9/00C02F1/66C02F1/281C02F1/469C02F2001/007C02F2001/46119C02F2001/46133C02F2101/20
Inventor 胡建龙陈家庆刘帆
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com