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Device and method for recovering urea and simultaneously producing struvite

A technology of struvite and urea, applied in fertilization equipment, chemical instruments and methods, preparation of urea derivatives, etc., can solve the problems of high energy consumption, difficult crystallization, and no promotion value, and achieve the effect of promoting ion migration

Pending Publication Date: 2022-07-29
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because urea is difficult to crystallize and easy to decompose at high temperature, there are relatively few methods for directly purifying urea at present. Forward osmosis-membrane distillation composite membrane system is often used in research to separate urea from urine, but it consumes a lot of energy. , has no promotional value

Method used

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  • Device and method for recovering urea and simultaneously producing struvite
  • Device and method for recovering urea and simultaneously producing struvite
  • Device and method for recovering urea and simultaneously producing struvite

Examples

Experimental program
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Effect test

Embodiment 1

[0071] The device for recovering urea and producing struvite at the same time is composed of a cavity, an external circuit and an external circulation system. The cavity is composed of an anode chamber, an intermediate chamber and a cathode chamber arranged in sequence along the horizontal direction. The exchange membrane is separated, the cathode chamber and the intermediate chamber are separated by a cation exchange membrane, the anode chamber and the cathode chamber are respectively used to hold the electrolyte, and the intermediate chamber is used to hold the urine to be treated;

[0072] The anode chamber and the cathode chamber are connected through an external circulation system, which consists of a pipeline and a peristaltic pump installed on the pipeline; a magnesium plate anode is set in the anode chamber, and a platinum carbon air cathode is set in the cathode chamber; the external circuit consists of wires and external resistors The anode and cathode are connected i...

Embodiment 2

[0075] The device for recovering urea and producing struvite at the same time: it consists of a cavity, an external circuit, an external circulation system, a high-precision voltmeter and a data acquisition system. The compartment and the intermediate compartment are separated by an anion exchange membrane, the cathode compartment and the intermediate compartment are separated by a cation exchange membrane, the anode compartment and the cathode compartment are respectively used to hold the electrolyte, and the intermediate compartment is used to hold the urine to be treated , the anode chamber and the cathode chamber are connected through an external circulation system composed of a hose and a peristaltic pump installed on the hose; wherein, the material of the cavity is plexiglass, the size is 7cm×7cm×2.5cm, and the volume of the cathode chamber is 30mL, the anode compartment volume is 30mL; the cation exchange membrane is CMI7000 (MembranesIiternational Inc, USA), the size is...

Embodiment 3

[0081] The method for reclaiming urea to produce struvite simultaneously, using the device in Example 1:

[0082] (1) Urine to be processed: 1.5g / LNa 2 SO 4 , 2.13g / LNaH 2 PO 4 ·2H 2 O 4 , 3g / LNaCl, 1.06g / LKCl, 0.67g / LNH 4 Cl, 0.689g / LNaOH, 2.19g / LNH 4 HCO 3 , 9.09mL / L ammonia water and 14.99g / L urea, the initial concentration of phosphorus is 440.12mg / L, and the initial conductivity is 13.08ms / cm; Inject 1g / LNa respectively 2 SO 4 , the anode and cathode are connected in series with the external resistance through the wire to form a primary battery for electrolysis, and at the same time, the peristaltic pump is turned on to circulate the electrolyte in the anode chamber and the cathode chamber. The flow rate is 2mL / min;

[0083] The anode magnesium plate and the air cathode spontaneously form an electric field, so that the cations in the urine migrate to the cathode compartment, and the anions migrate to the anode compartment to realize the separation of urea, and ...

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Abstract

The invention belongs to the technical field of urine wastewater treatment and resource utilization, and provides a device and method for recycling urea and producing struvite at the same time. The positive electrode chamber, the middle chamber and the negative electrode chamber are arranged, an external circuit is used for connecting a positive electrode and a negative electrode to spontaneously form an electric field to supply energy to the positive electrode chamber and the negative electrode chamber, ion migration is promoted, meanwhile, anions and cations in urine in the middle chamber directionally move by arranging an anion exchange membrane and a cation exchange membrane, and uncharged urea is reserved in the middle chamber; therefore, urea recovery is realized. The result of the embodiment shows that when the device provided by the invention is used for treating the urine, the concentration of urea in the treated middle chamber is 14.78 g / L, the concentration of phosphorus is 12.22 mg / L, the concentration of NH4 < + >-N is 17.75 mg / L, the conductivity of the urine is 0.23 ms / cm, and the separation of the urea from other components is realized; in addition, struvite with the purity of 85.30% is obtained.

Description

technical field [0001] The invention relates to the technical field of urine wastewater treatment and resource utilization, in particular to a device and method for recovering urea and producing struvite. Background technique [0002] Urine has a great potential resource. Studies have shown that each person produces an average of 500kg of urine per year. From this, it can be calculated that the total amount of nutrients excreted per person per year is 5.7kg of nitrogen, 0.6kg of phosphorus and 1.2kg of potassium, respectively. Emissions will result in a waste of useful resources in urine. Therefore, the treatment and recycling of urine from the source, taking urine as the target treatment liquid, and recovering the nitrogen and phosphorus in urine and other resources are in line with the concept of sustainability, which can complete the circular economy of food and energy and turn waste into waste. For the treasure, fill the vacancy of the existing agricultural fertilizer....

Claims

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Application Information

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IPC IPC(8): C25B1/18C25B1/50C25B9/21C25B9/15C05B7/00C07C273/16
CPCC25B1/18C25B1/50C25B9/21C25B9/15C05B7/00C07C273/16
Inventor 刘元邓迎迎张琪刘鸿
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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