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Adsorbent and method for synchronously removing ammonia nitrogen and phosphorus in sludge removal water

A technology for removing water and adsorbents, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., to achieve the effects of low preparation cost, solving large fluctuations in ammonia nitrogen and phosphorus concentrations, and reducing load

Active Publication Date: 2020-04-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an adsorbent and method for synchronously removing ammonia nitrogen and phosphorus in sludge removal water for the above-mentioned deficiencies in the prior art, which solves the pollution caused by the backflow of sludge filtrate and sludge digestate The problem of secondary removal of pollutants reduces the cost of sewage treatment plants

Method used

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  • Adsorbent and method for synchronously removing ammonia nitrogen and phosphorus in sludge removal water
  • Adsorbent and method for synchronously removing ammonia nitrogen and phosphorus in sludge removal water
  • Adsorbent and method for synchronously removing ammonia nitrogen and phosphorus in sludge removal water

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preparation example Construction

[0044] Modified zeolite I, its preparation method comprises the steps:

[0045] 1) Use a sieve to take natural zeolite with a particle size of 0.150mm to 0.425mm, wash it with deionized water until the water is clear, put it in an oven, and dry it at 105°C for 12 hours, and take it out for later use;

[0046] 2) Add 5g of the zeolite obtained in step 1) into 100ml of 1mol / L NaOH solution, shake in a constant temperature shaker in a water bath at 25°C for 2 hours, wash it with deionized water until it is neutral, and dry it for 12 hours;

[0047]3) Melt 0.6g of lanthanum chloride into 50ml of ethanol solution with a mass fraction of 20% in a 250ml Erlenmeyer flask to prepare a lanthanum chloride solution, put the Erlenmeyer flask into a water area constant temperature oscillator and vibrate at 30°C for 1h, Add 5g of zeolite to the Erlenmeyer flask, adjust the pH to 11 with 2mol / L NaOH solution, then put the Erlenmeyer flask into a constant temperature oscillator in a water bath...

Embodiment 1

[0065] Using the above-mentioned modified zeolite I and modified zeolite II to simultaneously remove ammonia nitrogen and phosphorus in sludge removal water, the specific steps are as follows:

[0066] (1) Take sludge removal water from Wuhan Shahu Sewage Treatment Plant, first use molybdenum antimony anti-spectrophotometry to detect the total phosphorus concentration in sludge removal water, and the test result is 35.4mg / L, so according to y=0.1665x +0.5455(R 2 =0.9779) the dosage of modified zeolite I is 6.4g / L.

[0067] (2) Nessler's reagent was used to detect the concentration of ammonia nitrogen in the sludge removal water by spectrophotometry, and the detection result was 90.6 mg / L. According to K=5.9964C 氨氮 -0.622 (R 2 =0.9729), draw this moment K=0.364;

[0068] (3) The dosage of modified zeolite II is z, z=y 0 / K=8 / 0.364=22.0g / L;

[0069](4) Mix 6.4g / L modified zeolite I and 22.0g / L modified zeolite II evenly and add them to the sample of sludge removal water t...

Embodiment 2

[0073] Using the above-mentioned modified zeolite I and modified zeolite II to simultaneously remove ammonia nitrogen and phosphorus in sludge removal water, the specific steps are as follows:

[0074] (1) Take sludge removal water from Wuhan Shahu Sewage Treatment Plant, first use molybdenum antimony anti-spectrophotometry to detect the total phosphorus concentration in sludge removal water, and the test result is 52.6mg / L, so according to y=0.1665x +0.5455 (R2=0.9779), the dosage of modified zeolite I is 9.3g / L.

[0075] (2) Nessler's reagent was used to detect the concentration of ammonia nitrogen in the sludge removal water by spectrophotometry, and the detection result was 325.6mg / L. According to K=3.9193C 氨氮 -0.529 (R 2 =0.9964), draw this moment K=0.184;

[0076] (3) The dosage of modified zeolite II is z, z=y 0 / K=10 / 0.184=54.4g / L;

[0077] (4) Mix 9.3g / L modified zeolite I and 54.4g / L modified zeolite II evenly and add them to the sample of sludge removal water ...

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Abstract

The invention relates to an adsorbent and a method for synchronously removing ammonia nitrogen and phosphorus in sludge removal water. The adsorbent is formed by mixing modified zeolite I and modifiedzeolite II, the modified zeolite I is zeolite modified by lanthanum chloride and roasted under alkaline conditions, and the modified zeolite II is zeolite modified by sodium chloride. The adding massratio of the modified zeolite I to the modified zeolite II is K, and K is in a certain relational expression with ammonia nitrogen concentration C in sludge removal water and total phosphorus concentration x in the sludge removal water; the addition amount y of the modified zeolite I and the total phosphorus concentration x in the sludge removal water form a certain relational expression, so thatthe addition amount of the modified zeolite II is obtained, then the sludge removal water is treated under a certain condition, and after treatment, the phosphorus residual concentration reaches thefirst-grade A standard (2mg / L), and the ammonia nitrogen removal rate can reach 90%.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an adsorbent and a method for synchronously removing ammonia nitrogen and phosphorus in sludge removal water. Background technique [0002] In the process of sludge concentration, digestion and dehydration in sewage treatment plants, high-concentration nitrogen and phosphorus wastewater with a treatment volume of 1% to 3% of influent water will be produced. The ammonia nitrogen content can generally reach 50 to 500 mg / L, and the phosphorus content is about 5 to 50 mg / L. 60mg / L. Generally speaking, this part of sludge removal water will be discharged into the front end of sewage treatment and treated together with the influent water, but it is easy to cause impact load, which will affect the normal operation of the sewage treatment plant in severe cases. If the single-stage biological nitrogen and phosphorus removal process is added, the cost will be high and the stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18C02F1/28C02F11/143B01J20/30C02F101/10C02F101/16
CPCB01J20/186C02F1/281C02F2101/105C02F2101/16C02F11/143
Inventor 桑稳姣李在国张春雨周冰凌李翠华
Owner WUHAN UNIV OF TECH
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