Constructed wetland matrix filling material for simultaneous nitrogen and phosphorus removal and its preparation method
A technology for simultaneous denitrification and dephosphorization and artificial wetlands, which is applied in the field of phosphorus matrix filler and its preparation, and simultaneously removes nitrogen, which can solve the problems of poor treatment effect, poor compressive strength and short service life, and achieve excellent purification. effect, improved service life, simplified selection effect
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Embodiment 1
[0031] Embodiment 1, the preparation method of the constructed wetland matrix filler for synchronous denitrification and dephosphorization, the preparation steps are as follows:
[0032] Step 1. Prepare modified fly ash. Mix fly ash with 2 mol / L sodium hydroxide solution at a weight ratio of 1:10, heat and stir in a closed container at 100°C for 24 hours, and centrifuge After separation, the obtained solid material was repeatedly washed until the pH was 7, dried in an oven and then prepared into powder;
[0033] Step 2, mixing modified fly ash, fly ash and cement in a ratio of 50:20:30 by weight, then adding water with 30% of the total weight of modified fly ash, fly ash and cement, and mixing evenly;
[0034] Step 3. Put the mixture obtained in Step 2 into a mold with a size of 70×70×70 mm, cure it for more than 8 days, and make the artificial wetland matrix filler after air-drying.
[0035] The packing prepared in the above-mentioned Example 1 has been tested to have a comp...
Embodiment 2
[0037] Embodiment 2, the preparation method of the constructed wetland matrix filler for synchronous denitrification and dephosphorization, the preparation steps are as follows:
[0038] Step 1. Prepare modified fly ash. After mixing fly ash and sodium hydroxide solution with a concentration of 4mol / L in a weight ratio of 1:8, heat and stir in a closed container at 100°C for 36 hours, and then centrifuge Finally, the obtained solid material was repeatedly washed until the pH was 7, and dried in an oven to prepare powder;
[0039] Step 2, mixing modified fly ash, fly ash and cement in a ratio of 40:40:20 by weight, then adding water with 70% of the total weight of modified fly ash, fly ash and cement, and mixing evenly;
[0040] Step 3: Put the mixture obtained in Step 2 into a mold with a size of 10×20×20 mm, cure it for more than 6 days, and make the artificial wetland matrix filler after air-drying.
[0041] The density of the filler prepared in the above-mentioned embodime...
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