Preparation method of carphosiderite catalyst and method for treating waste water through biological electron-Fenton system
A jarosite and catalyst technology, which is applied in the fields of electrochemical biocombination treatment, special compound water treatment, chemical instruments and methods, etc., can solve problems such as increasing energy consumption for wastewater treatment, and achieve good practical application prospects and system performance The effect of low power consumption and power consumption reduction
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Embodiment 1
[0025] Embodiment 1: preparation and characterization of pyrosite catalyst
[0026] (1) the preparation method of pyrosite catalyst mainly comprises the following steps:
[0027] ①Use 600mL deionized water and 50.0g FeSO 4 ·7H 2 O is dissolved and the pH is adjusted to 9-10 with NaOH solution;
[0028] ②Stationary aging for 16-24h, pour off the supernatant;
[0029] ③ Add FeSO 4 ·7H 2 O 50.0g, add the same volume of deionized water as the discarded supernatant, wash with H 2 SO 4 Adjust the pH of the solution to 4-5;
[0030] ④Place the solution obtained in step ③ in a constant temperature water bath at 40-42°C, let in air, and add 20-30mL of 10% H 2 o 2 Aqueous solution, stop the reaction when the solution is orange-yellow turbid. The reaction time is 2-3 hours. After suction filtration, dry at 60-100°C to obtain the phyllosite catalyst.
[0031] (2) Characterization of the catalyst prepared by the present invention
[0032] Characterization means such as X-ray dif...
Embodiment 2
[0034] Embodiment 2: the treatment effect of different systems on acid orange 7 (expressed in AO7) simulated wastewater
[0035] System I: The initial concentration of AO7 is 16mg / L, the volume of wastewater is 250mL, and the electrolyte Na 2 SO 4 The concentration is 50mM, and the current density j provided by bioelectricity (indicated by MFC in the figure) is 50mA / m 2 , the reaction temperature is 30±1°C.
[0036] System II: The initial concentration of AO7 is 16mg / L, the volume of wastewater is 250mL, the dosage of persulfate (expressed in PMS) is 5mM, and the electrolyte Na 2 SO 4 The concentration is 50mM, and the reaction temperature is 30±1°C.
[0037] System III: The initial concentration of AO7 is 16mg / L, the volume of waste water is 250mL, the dosage of pyrosite catalyst (expressed as Cat) is 0.5g / L, and the electrolyte Na 2 SO 4 The concentration is 50mM, and the reaction temperature is 30±1°C.
[0038]System IV: The initial concentration of AO7 is 16mg / L, th...
Embodiment 3
[0043] Example 3: The effect of catalyst dosage on the treatment of AO7 simulated wastewater by the biological electro-Fenton system.
[0044] Operating conditions: [AO7]=16mg / L, [PMS]=5mM, [Na 2 SO 4 ]=50mM, j=50mA / m 2 , initial pH=6, electrode is graphite plate, T=30±1°C.
[0045] The experimental results are shown in Table 1. The results showed that with the continuous increase of catalyst dosage, the residual rate of AO7 in wastewater decreased gradually, and the decolorization effect improved significantly. When the catalyst consumption was increased from 0.25g / L to 0.5 and 0.75g / L, after the reaction for 2h, the decolorization rate was increased from 87.5% to 96.4% and 97.2% respectively, showing that the catalyst consumption was within the scope of 0.25-0.75g / L. The biological electro-Fenton system has a very significant decolorization effect on AO7 wastewater.
[0046] Table 1 Effect of catalyst dosage on AO7 decolorization effect
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