Method for removing phosphorus by electrochemically regulating calcareous mineral
A calcareous mineral, electrochemical technology, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the inconvenience of operation, reduce the speed of ion exchange, and cannot realize the structure of the cathode chamber and the anode chamber. And other issues
Inactive Publication Date: 2020-10-30
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology
In this inventive technology, without the presence of the diaphragm, the structure of the cathode chamber and the anode chamber cannot be realized, and further, the H produced by the anode + and the OH produced by the cathode - The neutralization reaction will occur rapidly, so that the pH of the system remains neutral, the magnesium mineral particles in the solution cannot dissociate and remove magnesium ions, and the neutral environment cannot form struvite precipitation. Therefore, the existence of the cation exchange membrane has a great impact on This invention is very important, but the diaphragm reduces the ion exchange rate in the system, and the treatment efficiency is low. For 300mL phosphorus solution, the removal rate of phosphorus is 70% after 5 days of treatment; The exchange membrane requires frequent replacement, inconvenient operation and high cost
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Embodiment 1
[0031] Fill the calcite particles into the cuboid column, the particle size distribution (weight ratio) of the calcite filler: 2 , The effluent enters the sump, and samples are taken from the sump every 12 hours to detect the concentration of P in the sample. After continuous operation for 5 days, the removal rate of P remains above 98%.
Embodiment 2
[0033] The dolomite particles are filled into the cuboid column, and the calcite filler particle size distribution (weight ratio): 2 , The effluent enters the sump, and samples are taken from the sump every 12 hours to detect the concentration of P in the sample. After continuous operation for 5 days, the removal rate of P remains above 96%.
Embodiment 3
[0035] The limestone particles are filled into the cuboid column, and the calcite filler particle size distribution (weight ratio): 2 , the effluent enters the sump, and samples are taken from the sump every 12 hours to detect the concentration of P in the sample. After continuous operation for 5 days, the removal rate of P remains above 94%.
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The invention belongs to the field of electrochemical and environmental protection water treatment, and particularly relates to a method for removing phosphorus by electrochemically regulating a calcareous mineral. A vertical column body is filled with a calcareous mineral, a cathode and an anode are inserted into calcareous mineral particles, a direct-current power supply supplies power, and phosphorus-containing wastewater enters from the bottom of the vertical column body under the action of a power pump and flows out from a water outlet in the upper portion of the column body. According tothe method, a vertical column cavity is filled and then electrified, electrochemical acidolysis is carried out on the calcareous mineral by utilizing the anode to provide calcium ions, an alkaline environment is formed by utilizing accumulation of the cathode OH<->, and hydroxyl calcium phosphate precipitates are formed by phosphate radicals in the wastewater and the calcium ions in the alkalineenvironment, so that phosphorus in the wastewater is removed. According to the method disclosed by the invention, phosphorus in the wastewater can be efficiently removed without chemical addition, andfor the phosphorus wastewater with the initial concentration of 10-200mg / L, the removal rate of phosphorus can be kept at 95% or above in a single open circuit process.
Description
Technical field: [0001] The invention belongs to the field of electrochemical and environmental protection water treatment, in particular to a method for electrochemically regulating calcium minerals to remove phosphorus. Background technique: [0002] Phosphorus (P) is an essential nutrient element for plants, animals and humans. Modern agricultural and industrial activities produce a large amount of P-containing wastewater, and most of the P in the wastewater is in the form of orthophosphate ions (PO 4 3- ) in the form of waste water discharged into rivers and lakes, causing eutrophication of the water body and deteriorating the water quality environment. Therefore, it is necessary to remove phosphorus in wastewater. my country's "Pollutant Discharge Standards for Urban Sewage Treatment Plants" first-level standard clearly stipulates that the maximum allowable discharge concentration of total phosphorus is 0.5-1mg / L. In addition, according to the 2018 "China Ecological...
Claims
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IPC IPC(8): C02F1/463C02F101/10
CPCC02F1/463C02F2101/105
Inventor 赵旭李学伟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI