Zeolite synthesized from fly ash and a method for treating high-concentration ammonia-nitrogen wastewater by zeolite

A fly ash and zeolite technology, applied in water/sewage treatment, chemical instruments and methods, animal husbandry wastewater treatment, etc., can solve problems such as poor denitrification effect, poor buffering capacity of high ammonia nitrogen wastewater, and inhibition of microbial activity. Achieve the effects of improving wastewater treatment efficiency, realizing resource utilization, and reducing preparation costs

Active Publication Date: 2018-11-02
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When high-concentration ammonia nitrogen industrial wastewater is treated by biochemical methods, on the one hand, due to the poor buffering capacity of high ammonia nitrogen wastewater, a large amount of alkalinity needs to be added to maintain the pH value of the system; on the other hand, high concentration of free ammonia will inhibit the activity of microorganisms, resulting in biological Low treatment efficiency is a major difficulty in industrial wastewater treatment
In addition, the lack of carbon sources further limits the denitrification process, which leads to the poor denitrification effect of the traditional biological deammonization process for treating high-ammonia nitro

Method used

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  • Zeolite synthesized from fly ash and a method for treating high-concentration ammonia-nitrogen wastewater by zeolite
  • Zeolite synthesized from fly ash and a method for treating high-concentration ammonia-nitrogen wastewater by zeolite
  • Zeolite synthesized from fly ash and a method for treating high-concentration ammonia-nitrogen wastewater by zeolite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: a kind of method utilizing fly ash zeolite to pretreat high-concentration ammonia nitrogen wastewater, the synthesis of its zeolite comprises the steps:

[0032] (1) Fly ash pretreatment

[0033] Mix the fly ash and deionized water in a beaker at an appropriate volume ratio evenly, then place it in a magnetic stirrer in a constant temperature water area, stir for 48 hours at 25°C and 1800r / min for water washing pretreatment. After washing with water, centrifuge for solid-liquid separation, and discard the supernatant. And use absolute ethanol to clean the centrifuged water-washed fly ash, and repeat the operation 3 times. Take the dried fly ash and sieve it in a 200-mesh standard sieve. The material that passed the sieving was the washed fly ash prepared in this experiment, which was stored in a desiccator for later use.

[0034] (2) Preparation of zeolite

[0035] The pretreated fly ash and 2M NaOH solution were mixed uniformly in the autoclave at a r...

Embodiment 2

[0037] Embodiment 2: a kind of method utilizing fly ash zeolite to pretreat high-concentration ammonia nitrogen wastewater, the synthesis of its zeolite comprises the steps:

[0038] (1) Fly ash pretreatment

[0039] Mix fly ash and 2mol / L HCL solution in a beaker at a volume ratio of 11:1 (V / W), then place it in a magnetic stirrer in a constant temperature water area, stir for 1 hour at 80°C and 1800r / min for pickling preprocessing. After pickling, centrifuge for solid-liquid separation and discard the supernatant. Use deionized water to clean the residual Cl- in the acid-washed fly ash, and use 0.1mol / L AgNO after centrifugation 3 Solution detection of Cl in the supernatant - content. Repeat the above operation until no Cl can be detected in the supernatant - The presence.

[0040] Thereafter, 95% absolute ethanol and acid-washed fly ash were mixed evenly and centrifuged for solid-liquid separation, and the operation was repeated 3 times. The obtained fly ash was drie...

Embodiment 3

[0042] Embodiment 3: a kind of method utilizing fly ash zeolite to pretreat high-concentration ammonia nitrogen wastewater, the synthesis of its zeolite comprises the following steps:

[0043] Mix the fly ash and deionized water in a beaker at an appropriate volume ratio, and then place it in a magnetic stirrer in a constant temperature water area, stir for 48 hours at 25°C and 180r / min for water washing pretreatment. After washing with water, centrifuge at 5000r / min for 30min for solid-liquid separation, and discard the supernatant. And use absolute ethanol to clean the centrifuged water-washed fly ash, and repeat the operation 3 times. Take the dried fly ash and sieve it in a 200-mesh standard sieve. The material that passed the sieving was the washed fly ash prepared in this experiment, which was stored in a desiccator for later use.

[0044] Mix the above-mentioned water-washed fly ash and 2mol / L HCL solution in a beaker at a volume ratio of 9:1 (V / W), then place it in a...

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Abstract

The invention relates to the field of sewage treatment, in particular to zeolite synthesized from fly ash and a method for treating high-concentration ammonia-nitrogen wastewater by zeolite. The preparation method of zeolite comprises the step of pretreatment, that is, fly ash is washed and pickled sequentially, and washed-pickled fly ash is obtained; particularly, during washing, the fly ash is evenly mixed with pure water and stirred at 15-30 DEG C for 48 h, and washed fly ash is obtained by solid-liquid separation; during pickling, the washed fly ash and a 2 mol/L HCl solution are mixed ina volume ratio of 1:9, the mixture is stirred at 80 DEG C for 1 h, then solid-liquid separation, washing with water, washing with alcohol and drying are performed, and the washed-pickled fly ash is obtained. Zeolite is pretreated by pickling and water washing pretreatment, so that the ammonia-nitrogen removal rate of zeolite is higher than that of zeolite pretreated by pickling only, and is much higher than that of zeolite pretreated by water washing only; compared with direct pickling, the consumption of hydrochloric acid is reduced by 18.18% and the preparation cost is reduced.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a zeolite synthesized by using fly ash and a method for treating high-concentration ammonia-nitrogen wastewater. Background technique [0002] Ammonia nitrogen is one of the important reasons leading to eutrophication of water body. Therefore, the control of nitrogen load in wastewater, especially high concentration ammonia nitrogen wastewater treatment is particularly critical. High-concentration ammonia nitrogen wastewater mainly comes from industrial wastewater and aquaculture wastewater. According to the Announcement of the First National Survey of Pollution Sources (2010), the discharge of various source water pollutants was 1.7291 million tons of ammonia nitrogen and 4.7289 million tons of total nitrogen. Among them, the annual ammonia nitrogen production of industrial wastewater is 2.0167 million tons, and the ammonia nitrogen actually discharged into the environmental wat...

Claims

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Application Information

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IPC IPC(8): B01J20/18C01B39/02C02F1/28C02F101/16C02F103/20
CPCB01J20/18C01B39/02C01P2002/72C02F1/281C02F2101/16C02F2103/20
Inventor 许晓毅王斌周航金朝霞陆振飞姚学文陈琮吕晨培
Owner CHONGQING UNIV
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