Method for recycling phosphorus from sewage through bioelectrochemical struvite crystallization
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A bioelectrochemical and struvite technology, applied in chemical instruments and methods, biological water/sewage treatment, electrochemical biocombination treatment, etc., can solve problems such as system performance degradation, damage to the activity of electrogenic bacteria, and potential increase
Active Publication Date: 2018-10-16
TONGJI UNIV
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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 an overpotential that gradually increases , Magnesium source cost is still high and other restrictive factors
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Embodiment 1
[0032] Applied to sludge digestion liquid, the process flow is as follows:
[0033] 1. Construction of 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 the cathode chamber 4 of the dual-chamber microbial electrolysis cell are separated by a cation exchange membrane 3 (CMI-7000, Membrane International). Before the carbon brush anode is used, clean the impurities on the carbon fiber with deionized water, and heat it at 450°C for 30 minutes 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 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 the cathode chamber 4 of the dual-chamber microbial electrolysis cell are separated by a cation exchange membrane 3 (CMI-7000, Membrane International). Before the carbon brush anode is used, clean the impurities on the carbon fiber with deionized water, and heat it at 450°C for 30 minutes in a muffle furnace to facilitate the attachment of microorganisms. Before using the stainless...
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Abstract
The invention discloses a method for recycling phosphorus from sewage through bioelectrochemical struvite crystallization. The method aims to solve the problems that in existing recycling of phosphorus from sewage through bioelectrochemical struvite crystallization, an anode liquid is acidized, the overpotential is large, the magnesium source cost is high, and the like. Cheap magnesium ores are subjected to acidolysis in the anode liquid, acidification of the anode liquid is prevented, the overpotential is remarkably reduced, and the magnesium source cost is lowered. According to the method, based on a bichamber microbial electrolysis pool, under an extremely low externally applied voltage (0.3-1.2 V), an electrode reaction is performed to form conditions for acidification of the anode liquid and acidification of a cathode liquid; the crushed magnesium ores are added to an anode chamber, acidification of the anode liquid is prevented, the pH of the anode liquid is stabilized, and microorganisms are promoted to continuously degrade organic matter to generate power; and magnesium ions released through acidolysis of the magnesian cores move to an cathode through a cation exchange membrane under the drive of the electric filed force and has a crystallization reaction with ammonium radials and phosphate radicals under an alkaline condition, struvite deposits are formed, the pH of the cathode liquid is stabilized, and the purposes of removing and recycling the phosphorus from sewage are realized.
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...
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