Simultaneous nitrogen and phosphorus removal modified artificial zeolite for micro-polluted water, and preparation method thereof

Abstract

The invention discloses a simultaneous nitrogen and phosphorus removal modified artificial zeolite for micro-polluted water, and a preparation method thereof. The preparation method comprises the following steps of 1, preparing a rare earth solution having mass concentration of 0.5 to 1.0%, 2, drying fly ash zeolite at a temperature of 100 to 105 DEG C for 2 to 4 hours, 3, adding the rare earth solution into the dried fly ash zeolite, wherein each gram of the fly ash zeolite is added with 15 to 25mL of the rare earth solution, carrying out thermostatical treatment in a gas bath shaking table at a temperature of 20 to 25 DEG C and a rate of 150 to 180r / min for 20 to 24 hours, taking out the modified zeolite, washing the modified zeolite to a pH value of 7, and drying at a temperature of 100 to 105 DEG C for 2 to 4 hours to obtain the simultaneous nitrogen and phosphorus removal modified artificial zeolite for micro-polluted water. The simultaneous nitrogen and phosphorus removal modified artificial zeolite for micro-polluted water is mainly utilized for purification of eutrophic waste water, can remove nitrogen pollutants and phosphor pollutants in sewage simultaneously, and especially, has good purification effects on low-concentration waste water containing nitrogen and phosphor.

Description

technical field [0001] The invention belongs to the technical field of environmental chemical industry, and relates to a modified artificial zeolite for synchronous denitrification and dephosphorization of slightly polluted water and a preparation method thereof. Background technique [0002] Nitrogen and phosphorus pollution are the main causes of water eutrophication, and the economical and effective control of nitrogen and phosphorus pollution has become a hot issue that needs to be solved urgently in recent years. Generally, if the biological nitrogen and phosphorus removal process is used alone, it is difficult to meet the first-level discharge standards and reuse standards that the phosphorus content in the effluent water is less than 0.5 mg / L and the ammonia nitrogen content is less than 5 mg / L. If the biological denitrification and phosphorus removal process is added on the secondary basis, the infrastructure investment will be large and the land will be large, and t...

AI Technical Summary

Problems solved by technology

Research by Deyi Wu et al. pointed out that although fly ash zeolite has the ability to remove nitrogen and phosphorus, and has a certain removal effect in treating high-concentration phosphorus-containing sewage, the effect needs to be further strengthened. In addition, fly ash zeolite can be directly used for low-concentration phosphorus-containing sewage The effect of sewage treatment is not ideal. Therefore, it is very necessary to properly treat fly ash zeolite, strengthen its simultaneous deamination and dephosphorization ability, determine its process parameters, expand its application range, and make it a synchronous Water purification agent for nitrogen and phosphorus removal

[0007] In summary, the existing natural zeolite and artificial zeolite products have a good effect on the removal of ammonia nitrogen and heavy metal ions in water, but the removal of phosphorus in wastewater, especially for low-concentration nitrogen- and phosphorus-containing sewage (hereinafter referred to as micropollution water) synchronous removal effect is very unsatisfactory