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Modified zeolite organic matter composite agent for synchronous nitrogen and phosphorus removal of sewage, and preparation method, application and application method of modified zeolite organic matter composite agent

A simultaneous nitrogen and phosphorus removal and modified zeolite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problem of poor treatment effect of ammonia nitrogen and nitrate nitrogen, treatment Unstable effect, high operating cost and other problems, to achieve the effect of improving the removal effect, improving the removal efficiency, and broadening the wide application

Active Publication Date: 2015-10-14
NANJING UNIV
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  • Claims
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Problems solved by technology

[0007] Aiming at the problems of large dosage, high operating cost, poor treatment effect on ammonia nitrogen and nitrate nitrogen, and unstable treatment effect in existing sewage treatment agents, the present invention provides a modified zeolite for synchronous denitrification and phosphorus removal of sewage Organic compounding agent and its preparation method, application and application method, the present invention soaks artificial zeolite in cetyltrimethylammonium bromide and lanthanum chloride mixed solutions of different concentrations, and the modified zeolite and polyaluminum chloride Iron (PAFC) is compounded in different proportions to make a modified zeolite organic compound, which can be applied to the simultaneous removal of nitrogen and phosphorus pollutants in water in the process of sewage biochemical tail water treatment, and can also be used in sewage with very low nitrogen and phosphorus concentrations In advanced treatment, the purification effect is good

Method used

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  • Modified zeolite organic matter composite agent for synchronous nitrogen and phosphorus removal of sewage, and preparation method, application and application method of modified zeolite organic matter composite agent
  • Modified zeolite organic matter composite agent for synchronous nitrogen and phosphorus removal of sewage, and preparation method, application and application method of modified zeolite organic matter composite agent
  • Modified zeolite organic matter composite agent for synchronous nitrogen and phosphorus removal of sewage, and preparation method, application and application method of modified zeolite organic matter composite agent

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Experimental program
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Effect test

Embodiment 1

[0037] Raw materials: Artificial zeolite is purchased from Nanjing Chemical Reagent Co., Ltd., batch number is 11060120497, the particle size of artificial zeolite is 60-80 mesh, white particles, a kind of hydrated sodium aluminosilicate salt formed by mixing and melting clay, silica sand, sodium carbonate, etc., insoluble in water. Commercially available cetyltrimethylammonium bromide white powder and polyaluminum ferric chloride (PAFC).

[0038] The preparation process of modified zeolite organic compound agent (new coagulant):

[0039] (1) cetyltrimethylammonium bromide is configured into mass concentration and is respectively 5g / L, 10g / L, 20g / L, 30g / L, 40g / L solution;

[0040] (2) configuring lanthanum chloride into a rare earth solution with a mass concentration of 0.5%;

[0041] (3) Dry the 60-80 mesh artificial zeolite at 100°C for 4 hours;

[0042] (4) Get 5 Erlenmeyer flasks, add the cetyltrimethylammonium bromide solution that concentration is 5g / L, 10g / L, 20g / L, ...

Embodiment 2

[0045] Prepare the simulated sewage containing ammonia nitrogen 8mg / L, nitrate nitrogen 14mg / L and phosphorus 1.5mg / L, add the modified zeolite organic compound (modified 1) prepared in embodiment 1 to the simulated sewage, coagulant The dosage is 200mg / L. Use a mixer to quickly and fully stir (300r / min) for 30 seconds, then slowly stir (30r / min) for 25 minutes, and take the supernatant after standing for 30min. The concentration of ammonia nitrogen in the supernatant was determined by Nessler's reagent spectrophotometry, the concentration of nitrate nitrogen by thymol spectrophotometry, and the concentration of phosphorus by molybdate spectrophotometry. The other types of modified zeolite organic complex agents (ie, modified 2 to modified 5 prepared in Example 1) were also measured according to the method above to determine the concentration of the supernatant after corresponding treatment. Then separately measure the removal effect on simulated sewage when there is only zeo...

Embodiment 3

[0048] The biochemical effluent of a sewage treatment plant is taken, and its water quality indicators are: the concentration of ammonia nitrogen is 7.56mg / L, the concentration of total phosphorus is 1.12mg / L, and the concentration of nitrate nitrogen is 10.32mg / L.

[0049] Modified 1 (i.e. the modified zeolite organic compound prepared when the mass concentration of cetyltrimethylammonium bromide was 5g / L) was prepared according to the method of Example 1, and 200 mg of the modified zeolite organic compound prepared was weighed In a 2L beaker, add 1L of the effluent from the sewage treatment plant, stir it fully (300r / min) for 30 seconds with a mixer, then stir slowly (30r / min) for 25 minutes, and take the supernatant after standing for 1h Determination. The removal rate of ammonia nitrogen can reach 70.21%, the removal rate of total phosphorus can reach 92.35%, and the removal rate of nitrate nitrogen can reach 52.64%.

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Abstract

The invention discloses a modified zeolite organic matter composite agent for synchronous nitrogen and phosphorus removal of sewage, and a preparation method, application and an application method of the modified zeolite organic matter composite agent, belonging to the field of waste water treatment. According to the invention, a mixed solution of hexadecyltrimethylammonium bromide and lanthanum chloride is used as a modifying solution to be used for modifying zeolite, and then the modified zeolite is mixed with polyaluminum ferric chloride (PAFC) in different ratios to prepare the modified zeolite organic matter composite agent. The modified zeolite organic matter composite agent is applied to biochemistry tail water in a sewage treatment plant, the ammonia nitrogen treatment effect is relatively good, and nitrate nitrogen and total phosphorus treatment effects are improved greatly. The composite agent has the advantages of being easy to operate, better than a coagulant in settling property, good in treatment effect, wide in application range and capable of removing nitrate nitrogen and ammonia nitrogen simultaneously; in the practical engineering operation, the use amount of the composite agent can be changed flexibly to realize an ideal treatment effect, nitrogen and phosphorus contaminants in water can be removed synchronously, and particularly a very good purifying effect on low-concentration nitrogen and phosphorus in the biochemistry tail water is realized.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and more specifically relates to a modified zeolite organic composite agent for synchronous denitrification and dephosphorization of sewage and its preparation method, application and application method. Background technique [0002] In recent years, with the rapid development of my country's economy and the acceleration of urbanization, the discharge of urban sewage has increased, and a large amount of biochemical tail water without advanced treatment has been discharged into rivers and lakes, causing a large amount of nitrogen and phosphorus elements in the environmental water body. Accumulation, even in some surface water nitrogen and phosphorus elements exceed the standard. Nitrogen and phosphorus excess is an important factor causing water eutrophication. A large amount of nutrients such as nitrogen and phosphorus required by organisms enter the water body, causing algae and other plankto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/52
Inventor 刘波侯翔宇陆鑫丁新春王德鹏姚芳李睿华周德超
Owner NANJING UNIV
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