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Method for removing phosphorus by utilizing waste cement

A cement and wastewater technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problems of susceptibility to temperature, poor stability, etc. Good phosphorus removal effect

Inactive Publication Date: 2012-07-04
INST OF AQUATIC LIFE ACAD SINICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of the biological phosphorus removal process is relatively poor, and it is easily affected by various factors such as temperature and pH (Mino T. Microbiology and biochemistry of the enhanced biological phosphate removal process [J]. Water Research. 1998, 32 (11 ): 3193-3207.)

Method used

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  • Method for removing phosphorus by utilizing waste cement
  • Method for removing phosphorus by utilizing waste cement
  • Method for removing phosphorus by utilizing waste cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of method utilizing waste cement to remove phosphorus, its step is:

[0021] A: Weigh cement powder in different amounts (0.2g, 0.3g, 0.4g, 0.6g, 0.8g, 1.0g, 1.2g, 1.5g, 2.0g) into a 250mL conical flask;

[0022] B: Add 100mL of waste water with a phosphorus concentration of 25mg / L to each Erlenmeyer flask, seal the Erlenmeyer flask and place it in a constant temperature oscillator, and set the temperature at 25±1°C;

[0023] C: After shaking for 24±1h, centrifuge to measure the concentration of TP in the supernatant.

[0024] Depend on figure 1 It can be seen that with the increase of the amount of cement powder, the concentration of phosphorus (TP) in the solution decreases gradually, and the removal rate increases gradually. When the dosage increased from 2g / L to 3g / L, the phosphorus (TP) removal rate rose rapidly from 49.06% to 95.13%; when the dosage continued to increase, the phosphorus (TP) removal rate tended to be stable. The amount of cement powder i...

Embodiment 2

[0026] The difference from Example 1 is: 0.3g of cement powder was weighed into a 250mL conical flask, and 100mL of wastewater with a phosphorus concentration of 25mg / L was added. Set different temperatures (5°C or 10°C or 15°C or 20°C or 25°C or 30°C or 35°C), the effect of temperature on phosphorus removal in wastewater is as follows figure 2 shown.

[0027] Depend on figure 2 It can be seen that temperature has a certain influence on the removal of phosphorus in water by cement powder. When the temperature is 5℃, the removal rate is the lowest, which is 92.51%. When the temperature ranged from 5°C to 25°C, the removal rate of TP increased from 92.51% to 94.54%. When the temperature continued to increase, the removal rate began to decrease. Therefore, it is considered that the optimum adsorption temperature is 22-26°C.

Embodiment 3

[0029] The difference from Example 1 is: Weigh 0.3 g of cement powder into a 250 mL Erlenmeyer flask, and add 100 mL of a solution with a phosphorus concentration of about 25 mg / L. Set different shaking time (1h or 2h or 4h or 8h or 12h or 18h or 24h or 36h or 48h), centrifuge to measure the TP concentration in the supernatant. The effect of shaking time on phosphorus removal as image 3 shown.

[0030] Depend on image 3 It can be seen that with the extension of the oscillation time, the removal rate of TP gradually increases. When the time was extended from 1h to 8h, the removal rate increased significantly, from 69.98% to 94.02%; and from 8h to 48h, the removal rate did not change significantly, indicating that the adsorption of cement to phosphorus had basically reached saturation when the oscillation time was 8h state. Therefore, it is considered that the best oscillation time is 7-9h.

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Abstract

The invention discloses a method for removing phosphorus by utilizing waste cement. The method comprises the following steps: A) crushing and milling the waste cement, then screening, and weighing and placing the waste cement in the different use quantities into conical flasks; B) adding simulated wastewater in different phosphorus concentrations; and C) oscillating on a constant-temperature oscillator for a certain time and determining the concentration of TP (total phosphorus) in supernatant fluid by virtue of centrifugation, wherein as for the wastewater in the phosphorus concentration of 25mg / L, the use quantity of cement powder is 3g / L, the temperature is 25 DEG C and the oscillating time is 8h; and a linear relation y=0.0955x+0.351 is formed between the use quantity of the cement powder and the phosphorus concentration of the wastewater. The method has the advantages of cheap and easily available raw materials, simplicity in operation, high efficiency, no environmental pollution and wide application range, and can be applied to treatment of the phosphorus-containing wastewater and control of the phosphorus content in a eutrophic water body, and a new way is simultaneously provided for resource utilization of abandoned building wastes.

Description

technical field [0001] The invention belongs to the technical field of water environment treatment, and particularly relates to a method for removing phosphorus by using waste cement, which is suitable for the treatment of phosphorus-containing wastewater and the reduction of phosphorus load in eutrophic water bodies. Background technique [0002] Eutrophication of water body is a global problem, and high nutrient load is one of the main causes of water body eutrophication. It is the consensus of scholars at home and abroad to control and reduce the concentration of nutrients in water. Phosphorus is the most common limiting factor of lake eutrophication, and controlling the phosphorus load in water is one of the basic conditions for eutrophication control. A large amount of phosphorus-containing wastewater is continuously poured into lakes, rivers, reservoirs and other water bodies, which is the main reason for the high phosphorus load of sewage receiving water. Therefore,...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/58
Inventor 梁威贾陈蓉代嫣然吴振斌
Owner INST OF AQUATIC LIFE ACAD SINICA
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