Method for preparing phosphorus removal adsorbent based on natural zeolite synthetic molecular sieve waste
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A natural zeolite and phosphorus adsorbent technology, applied in the field of environmental engineering, can solve the problems of high preparation cost, complicated process, and low practical application value, and achieve the effect of realizing waste utilization
Inactive Publication Date: 2020-08-14
BEIJING UNIV OF TECH
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[0004] At present, the adsorbents with better phosphorus adsorption performance are mainly artificial synthetic materials, including hydrotalcites and various metal oxides, but most of these materials are synthesized by all reagents, the preparation cost is high, the process is complicated, and the practical application value is not high.
However, some natural minerals are cheap and come from a wide range of sources, but their phosphorus adsorption capacity is relatively low.
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[0025] (1) Concentration of lanthanum solution
[0026] The concentration of the lanthanum solution is set to be 0.15%, 0.55%, 0.95%, 1.35%, 1.75%, 2.15%, 2.55%, 2.95%, 3.35%, 3.75%, 4.15% (mass concentration), and the reaction time is 12h, and A series of lanthanum-modified filter residues were prepared under the same conditions as the previous preparation process.
[0027] Accurately weigh 0.1g of different lanthanum-modified filter residues, put them into 100mL, KH 2 PO 4 Concentration of 50mg / L (in terms of P) in the Erlenmeyer flask. After oscillating at 25°C and 220r / min for 12 hours, the supernatant was taken to measure the concentration of phosphate, and the equilibrium adsorption amount was calculated. (attached image 3 )
[0028] (2) Reaction time
[0029] The reaction time was set to 2, 4, 8, 12, and 16 hours respectively, and a series of lanthanum-modified filter residues were prepared under the conditions of the optimal lanthanum solution concentration and ...
Embodiment
[0033] The preparation of lanthanum-modified filter residue adsorbent: take a certain amount of waste filter residue (grinding, pass 100 mesh sieve) in three-neck flask, add the lanthanum chloride solution that mass percent concentration is 3.35% by solid-liquid mass ratio 1:20, add A certain amount of sodium hydroxide solution is used to adjust the pH value of the mixed solution to 11, and the flask is placed in a magnetic stirrer, and stirred and reacted at 60°C for 12 hours, the mixed solution is suction-filtered, rinsed until the pH is neutral, and then dried to obtain lanthanum Modified filter residue.
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Abstract
The invention discloses a method for preparing a phosphorus removal adsorbent based on natural zeolite synthetic molecular sieve waste, and belongs to the technical field of environmental engineering.Lanthanum modification is carried out on waste filter residues generated by synthesis of molecular sieves from natural zeolite to prepare lanthanum-modified filter residues with phosphate adsorptionperformances, and the lanthanum-modified filter residues can be used for deep phosphorus removal of secondary treatment effluent of municipal sewage plants. Based on the characteristics of rich pore channels, large specific surface area and strong alkalinity of the molecular sieve synthetic waste filter residues, the lanthanum element is successfully loaded on the surfaces of the pore channels ofthe filter residues, so that the filter residues have strong phosphate adsorption performance, and the comprehensive utilization of wastes is realized. The invention provides a solution for comprehensively utilizing the molecular sieve to synthesize the waste filter residues, and the method has a good application prospect in advanced sewage treatment.
Description
technical field [0001] The invention relates to a method for preparing a lanthanum-modified phosphorus-removing adsorbent based on filter residue, which is a waste material produced by synthesizing molecular sieves from natural zeolite. It belongs to the field of environmental engineering technology. Background technique [0002] Phosphorus is not only an important natural resource, but also one of the main pollutants in the water environment. Excessive phosphorus in water will lead to eutrophication and seriously endanger the aquatic environment. Literature research shows that most aquatic organisms such as algae are more sensitive to phosphorus than nitrogen, so controlling phosphorus discharge is more practical to solve the problem of water eutrophication. [0003] Due to the limitation of traditional sewage biological treatment technology, the effluent of municipal sewage plants still contains a certain concentration of nitrogen and phosphorus, and the reuse of landscap...
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