Method for removing phosphor-containing wastewater by using fly ash aerated concrete slag

A technology for aerated concrete and fly ash, which is applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of long processing time, uneconomical, low efficiency, etc., and achieves a simple process device. , the effect of low operating cost and easy implementation

Inactive Publication Date: 2009-07-08
深圳龙澄高科技环保股份有限公司
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  • Abstract
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Problems solved by technology

But this method has the following three disadvantages: first, the alkalinity of the water discharged from the second stage is relatively high, which does not meet the discharge standards; second, the precipitation of calcium phosphate is not complete, and the purpose of phosphorus removal is not achieved; third, The added lime is not fully utilized and uneconomical
This patented technology can realize phosphorus recovery, but this technology can only treat wastewater with low phosphorus content (phosphorus content is less than 1mg / l), and the phosphorus adsorption time and phosphorus elution time need more than 10 hours, while the phosphorus removal rate Only between 60% and 80%, there are problems such as long processing time and low efficiency

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  • Method for removing phosphor-containing wastewater by using fly ash aerated concrete slag
  • Method for removing phosphor-containing wastewater by using fly ash aerated concrete slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Determination of the isotherm curve of fly ash air-entrained concrete slag adsorbing phosphate in phosphorus-containing sewage.

[0024] 1. Crush and sieve the collected waste fly ash aerated concrete blocks to obtain slag with a particle size of 0.01-1.0mm;

[0025] 2. Use potassium dihydrogen phosphate and distilled water to prepare 100ml of artificial phosphorus-containing sewage with a phosphorus content of 10mg / l, 20mg / l, 50mg / l, 80mg / l, 100mg / l, 500mg / l, and 1000mg / l, respectively, and respectively placed in 250ml Erlenmeyer flasks;

[0026] 3. Add 10g of fly ash aerated concrete slag baked at 100 degrees Celsius to constant weight to the above-mentioned various artificial phosphorus-containing sewage. Shake and soak for 45 minutes on a rotary shaker with a rotation speed of 100rpm and a temperature set at room temperature, so that the fly ash aerated concrete slag reaches the adsorption phosphorus equilibrium;

[0027] 4. Use the ammonium molybdate method to de...

Embodiment 2

[0037] 1. Crush and sieve the collected fly ash aerated concrete blocks to obtain slag with a particle size of 0.01-1.0 mm, and dry it;

[0038] 2. Take 10g of baked fly ash aerated concrete slag, add 100ml of distilled water, and then add 6.59g of solid potassium dihydrogen phosphate every 60min. And use the ammonium molybdate method to measure the change of the phosphorus content in the solution, until the phosphorus content in the aqueous solution no longer drops, stop adding potassium dihydrogen phosphate. At this time, the fly ash aerated concrete slag reaches the adsorption saturation state;

[0039] 3. According to the supernatant volume and phosphorus content when the fly ash aerated concrete slag reaches the adsorption saturation state, the maximum phosphorus adsorption capacity of the fly ash aerated concrete slag per unit weight can be calculated. Its value is 0.535g / g, that is, every gram of fly ash aerated concrete slag can absorb 0.535g of phosphorus.

Embodiment 3

[0041] 1. Crush and sieve the collected fly ash aerated concrete blocks to obtain slag with a particle size of 0.01-1.0 mm, and bake to constant weight;

[0042] 2. Add 20g of baked fly ash aerated concrete slag to 100ml of standard dipotassium hydrogen phosphate solution with a concentration of 50mg / l, 80mg / l, 100mg / l, 120mg / l, and 150mg / l, soak 30min;

[0043] 3. Take the soaking solution to detect the phosphorus content therein. The measured phosphorus removal rates were 100%, 100%, 99.5%, 97.8%, and 86.4%, respectively. Except that the phosphorus removal rate of the sewage with a concentration of 150mg / l is less than 90%, the phosphorus removal rates of the other four kinds of phosphorus-containing sewage are all above 97.5%. It shows that the fly ash aerated concrete slag can be used to treat medium and low phosphorus sewage.

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Abstract

The invention discloses a method for removing phosphorus in phosphorous wastewater through broken slag of building waste such as waste fly ash aerated concrete blocks. After treatment, the removing rate of the phosphorus can reach over 99 percent. The fly ash aerated concrete blocks are crushed to form the broken slag having the particle diameter of between 0.01 and 1.0 mm; and the broken slag is filled in equipment with a similar sand filter structure to form a phosphorus filter. As fly ash aerated concrete has the property of high-efficiency adsorption to the phosphorous, the phosphorous in the wastewater is continuously adsorbed and removed when the phosphorous wastewater passes through the phosphorus filter; the content of the phosphorus in the adsorbed saturated broken slag reaches as high as 34.85 percent (be equivalent to 79 percent of P2O5); and the broken slag can be used as a slow-release phosphate fertilizer for application or a high-quality raw material for preparing phosphoric acid and phosphate. The method has a simple process and easy implementation, can remove pollution of the phosphorus of the wastewater to environment, can perform resource utilization of the phosphorus in the waste fly ash aerated concrete blocks and the wastewater, uses waste to treat waste, and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and resource utilization, and relates to a method for removing phosphorus in sewage, in particular to a method for absorbing and recovering phosphorus in sewage by using construction waste—fly ash aerated concrete slag. Background technique [0002] Phosphorus is an indispensable nutrient element for all living organisms on earth, and it is also a non-renewable and irreplaceable resource. Based on the current consumption of phosphorus, the world's proven reserves of phosphate rock can only last for about 100 years. Although China's phosphorus reserves rank third in the world, it is estimated that phosphate rock with low impurity content and high grade will be mined in the next 20 years. Therefore, the Ministry of Land and Resources has listed phosphate rock resources as one of the 20 types of minerals that cannot meet the requirements of national economic development after 2010. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/28
Inventor 张涉马辉文汪春霞卿惠广
Owner 深圳龙澄高科技环保股份有限公司
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