Method for recovering nitrogen and phosphorus in sewage by electrochemical struvite crystallization
A struvite and electrochemical technology, which is applied in the field of nitrogen and phosphorus sewage treatment and resource utilization, can solve the problems of low purity, high pharmaceutical cost, and low struvite efficiency.
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Embodiment 1
[0025] Build a double-chamber electrolytic cell reactor: made of plexiglass, the shape is a cylinder, the cathode and anode chambers each occupy half of the cylinder, and the volume is 300ml respectively; the two chambers are separated by a cation exchange membrane. A ruthenium-iridium-titanium plate is used as the anode, and a 304 stainless steel mesh is used as the cathode; a 10Ω high-precision resistor is connected in series in the circuit; the Keithley2700 data acquisition system is used to monitor the voltage at both ends of the resistor to calculate the system current; an air bag with good airtightness is used Gas produced in the cathode compartment is collected. Set the anolyte to 15mM Na 2 SO 4 , the cathode chamber is 10mM (NH 4 ) 2 SO 4 and 10mM NH 4 h 2 PO 4 , the molar ratio of N and P is controlled to be 3:1, and the final NH 4 + -N is 30mM, PO 4 3--P is 10 mM. With 0.1M NaOH and 0.1MH 2 SO 4 Adjust and control the initial pH of the anolyte to 7, and...
Embodiment 2
[0027] Build a double-chamber electrolytic cell reactor: made of plexiglass, the shape is a cylinder, the cathode and anode chambers each occupy half of the cylinder, and the volume is 300ml respectively; the two chambers are separated by a cation exchange membrane. A ruthenium-iridium-titanium plate is used as the anode, and a 304 stainless steel mesh is used as the cathode; a 10Ω high-precision resistor is connected in series in the circuit; the Keithley2700 data acquisition system is used to monitor the voltage at both ends of the resistor to calculate the system current. Use an airtight air bag to collect the gas produced in the cathode chamber; set the anolyte to 15mM Na 2 SO 4 , the cathode chamber is the control PO 4 3- -P concentration is 10mM, set N:P=1:1, its corresponding NH 4 + -N concentrations were 30 mM, respectively. with 0.1M NaOH and 0.1M H 2 SO 4 Adjust and control the initial pH of the anolyte to 7, and the initial pH of the catholyte to 5. The part...
Embodiment 3
[0029] Build a double-chamber electrolytic cell reactor: made of plexiglass, the shape is a cylinder, the cathode and anode chambers each occupy half of the cylinder, and the volume is 300ml respectively; the two chambers are separated by a cation exchange membrane. A ruthenium-iridium-titanium plate is used as the anode, and a 304 stainless steel mesh is used as the cathode; a 10Ω high-precision resistor is connected in series in the circuit; the Keithley2700 data acquisition system is used to monitor the voltage at both ends of the resistor to calculate the system current; an air bag with good airtightness is used Gas produced in the cathode compartment is collected. Select 15mMNa 2 SO 4 For the anolyte, it is used to increase the conductivity of the anolyte. Catholyte is 10mM NH 4 h 2 PO 4 , 10mM (NH 4 ) 2 SO 4 Prepare the simulated wastewater and control the molar ratio of N:P to be 3:1, and the final NH 4 + -N concentration is 420mg / L, PO 4 3- -P concentration...
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