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

A method for bioelectrochemical struvite crystallization to recover phosphorus from sewage

A bioelectrochemical and struvite technology, applied in chemical instruments and methods, biological water/sewage treatment, electrochemical-biological combined treatment, etc., can solve the problems of high cost of magnesium sources, reduced system performance, and increased potential.

Active Publication Date: 2020-06-12
TONGJI UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pH gradient between the two chambers of DMEC (the pH of the anolyte drops and the pH of the catholyte rises) will continue to increase the acidification of the anolyte, damage the activity of electrogenic bacteria and lead to a gradual decrease in system performance; at the same time, the system also has a gradual increase in overpotential , Magnesium source cost is still high and other restrictive factors

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
  • A method for bioelectrochemical struvite crystallization to recover phosphorus from sewage
  • A method for bioelectrochemical struvite crystallization to recover phosphorus from sewage
  • A method for bioelectrochemical struvite crystallization to recover phosphorus from sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Applied to sludge digestion liquid, the process flow is as follows:

[0033] 1. Construction of the double-chamber microbial electrolytic cell:

[0034] The structure of the double-chamber microbial electrolytic cell is as follows: figure 2 As shown, including: 1 anode chamber, 2 carbon brush anode electrode, 3 cation exchange membrane, 4 cathode chamber, 5 stainless steel mesh cathode electrode, 6 anode chamber inlet, 7 cathode chamber inlet / gas collection port, 8 wires, 9 potentiostat, 10 wire, 11 high-precision resistor, 12 titanium wire, 13 data acquisition system.

[0035] The anode chamber 1 and cathode chamber 4 of the dual-chamber microbial electrolysis cell are separated by a cation exchange membrane 3 (CMI-7000, Membrane International). Before using the carbon brush anode, the impurities on the carbon fiber were cleaned with deionized water, and heated at 450 °C for 30 min in a muffle furnace to facilitate the attachment of microorganisms. Before using the...

Embodiment 2

[0042] Applied to urine, the technological process is as follows:

[0043] 1. Construction of the double-chamber microbial electrolytic cell:

[0044] The structure of the double-chamber microbial electrolytic cell is as follows: figure 2 As shown, including: 1 anode chamber, 2 carbon brush anode electrode, 3 cation exchange membrane, 4 cathode chamber, 5 stainless steel mesh cathode electrode, 6 anode chamber inlet, 7 cathode chamber inlet / gas collection port, 8 wires, 9 potentiostat, 10 wire, 11 high-precision resistor, 12 titanium wire, 13 data acquisition system.

[0045] The anode chamber 1 and cathode chamber 4 of the dual-chamber microbial electrolysis cell are separated by a cation exchange membrane 3 (CMI-7000, Membrane International). Before using the carbon brush anode, the impurities on the carbon fiber were cleaned with deionized water, and heated at 450 °C for 30 min in a muffle furnace to facilitate the attachment of microorganisms. Before using the stainles...

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 size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
Login to View More

Abstract

The invention discloses a bioelectrochemical struvite crystallization method for recycling phosphorus from sewage. Aiming at the problems of acidification of anolyte, large overpotential, and high cost of magnesium source in existing bioelectrochemical struvite crystallization to recover phosphorus from sewage, the present invention uses cheap magnesium ore to acidolyze in anolyte to prevent acidification of anolyte and significantly reduce Small overpotential and reduced magnesium source cost. The method of the present invention is based on the condition that the electrode reaction of the double-chamber microbial electrolytic cell forms the acidification of the anolyte and the alkalinization of the catholyte under an extremely low applied voltage (0.3-1.2V), and the broken magnesium ore is added to the anode chamber to prevent the anolyte Acidification stabilizes the pH of the anolyte, and promotes the continuous degradation of organic matter by microorganisms to generate electricity; the magnesium ions released by the acid hydrolysis of magnesium minerals migrate to the cathode through the cation exchange membrane under the force of the electric field, and interact with the ammonium and phosphate in the sewage in the cathode chamber. Under alkaline conditions, crystallization reaction occurs, struvite precipitates are formed, and the pH of catholyte is stabilized, achieving the purpose of simultaneous removal and recovery of sewage phosphorus.

Description

technical field [0001] The invention relates to a method for collecting phosphorus from sewage by bioelectrochemical struvite crystallization, and belongs to the field of phosphorus-rich sewage treatment and resource utilization. Background technique [0002] Phosphorus is an important nutrient element with a wide range of uses, including food, fertilizers, pesticides, etc., and is mainly used to produce fertilizers. In the current production and life, a large amount of phosphorus-rich sewage is produced, such as sludge digestion liquid, aquaculture wastewater biogas slurry, urine, etc. If it is directly discharged into the environment, it will cause pollution problems such as eutrophication of the water body. At the same time, phosphorus is a non-renewable resource, and the global phosphorus resources are in short supply. my country also lists it as a strategic reserve resource. Therefore, it is of great practical significance to recover phosphorus from phosphorus-rich sew...

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 Patents(China)
IPC IPC(8): C25B1/18C25B5/00C25B9/08C02F3/00C25B9/19
CPCC25B1/18C25B5/00C02F3/005C25B9/19Y02E50/30
Inventor 张志强王作斌张姣夏四清
Owner TONGJI UNIV
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