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Regenerative coagulant, and preparation method and using method thereof

A coagulant and concrete technology, which is applied in the fields of temperature control sludge treatment, flocculation/sedimentation water/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. Due to the limited landfill site and other problems, it has achieved the effect of reducing the cost of wastewater treatment, improving the utilization rate of coagulant, and making significant technological progress.

Inactive Publication Date: 2012-07-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used coagulants generally have disadvantages such as high price and poor treatment effect on hydrophilic dyes. The generated sludge cannot be reused. It needs to be solidified and stabilized before landfill. The cost is high and the landfill site is limited.
In addition, the traditional coagulant treatment of printing and dyeing wastewater has a slow settling speed of alum flowers, sludge concentration, and difficulty in filtration.
If the sludge is not handled properly, it is easy to cause secondary pollution

Method used

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  • Regenerative coagulant, and preparation method and using method thereof
  • Regenerative coagulant, and preparation method and using method thereof
  • Regenerative coagulant, and preparation method and using method thereof

Examples

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Effect test

Embodiment 1

[0029] Such as figure 1 Shown is a schematic diagram of the process for the preparation and recycling of the new renewable coagulant proposed by the present invention. Collect waste concrete, remove sand and gravel, crush it to a particle size of less than 25 mm, and then use an autogenous mill to grind it to a particle size of less than 2 mm, pass through a 150-mesh sieve, and calcinate at 550°C for 2 hours, and then cool , using a high-pressure roller mill to grind to obtain a particle size of less than 0.03 mm and a specific surface area of ​​3000-4000 cm 2 / g of powder is the coagulant.

[0030] The simulated dye wastewater with hydrophobic disperse scarlet dye at a concentration of 0.15 g / L had an initial pH of about 8.0 and an absorbance of 1.41. It was treated with the above coagulant, first stirred at a high speed (200 r / min) for 30 min, then stirred at a slow speed (100 r / min) for 5 h, and finally settled for 30 min, and the supernatant was taken to measure the abso...

Embodiment 2

[0034]Collect the discarded concrete, remove the sand and gravel, first crush it to a particle size of less than 25 mm, then use an autogenous mill to grind it to a particle size of less than 2 mm, pass through a 150-mesh sieve, and calcinate at 600 °C for 2 h, after cooling , using a high-pressure roller mill to grind to obtain a particle size of less than 0.03 mm and a specific surface area of ​​3000-4000 cm 2 / g of powder is the coagulant.

[0035] The simulated dye wastewater with hydrophilic reactive brilliant blue dye at a concentration of 0.14 g / L had an initial pH of about 10.4 and an absorbance of 0.76. Treat it with the above coagulant, first stir it at a high speed (200 r / min) for 30 min, then adjust it at a slow speed (100 r / min) for 5 h, and finally settle it for 30 min, and take the supernatant to measure its absorbance and pH. Gradually increasing the dosage of coagulant, the coagulation dye removal rate increased accordingly, when the dosage of coagulant reach...

Embodiment 3

[0039] Collect the discarded concrete, remove the sand and gravel, first crush it to a particle size of less than 25 mm, then use an autogenous mill to grind it to a particle size of less than 2 mm, pass through a 150-mesh sieve, and calcinate at 650 ° C for 2 h, after cooling , using a high-pressure roller mill to grind to obtain a particle size of less than 0.03mm and a specific surface area of ​​3000-4000 cm 2 / g of powder is the coagulant.

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Abstract

The invention relates to a regenerative coagulant, and a preparation method and a using method thereof. The regenerative coagulant is characterized in that: the regenerative coagulant is prepared from waste concrete serving as a raw material. The preparation method comprises the following specific steps of: collecting the waste concrete, rejecting sands, crushing and grinding the waste concrete, sieving the ground concrete by using a 150-mesh sieve, calcinating the sieved concrete for 2h, cooling the calcinated concrete and levigating the cooled concrete to obtain the regenerative coagulant in form of powder with the particle sizes of less than 0.03mm and the specific surface area of 3,000 to 4,000 cm<2> / g. The regenerative coagulant and the preparation method ensure a good coagulation effect by fully utilizing the hydration of artificial minerals such as monocalcium aluminate, dicalcium phosphate, tricalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite and the like, the electrical neutralization, absorption and enmeshment effects of hydrolyzate and the synergism of coagulation and precipitation; and in the using method, coagulant regeneration is realized by utilizing the high precipitation performance of coagulation sludge and adopting filtration, drying and calculation flows to recycle the coagulant for many times.

Description

technical field [0001] The invention relates to a renewable coagulant and its preparation and use method, which are used for the treatment of refractory printing and dyeing wastewater and other wastewater, and belong to the technical field of environmental protection. Background technique [0002] The printing and dyeing industry is a large industrial pollutant discharge. At present, the total discharge of printing and dyeing wastewater in my country has reached 5.5×10 8 t / a, accounting for about 13% of the entire industrial wastewater. The difficulties in the treatment of textile printing and dyeing wastewater are: (1) high COD, poor biodegradability; (2) high chroma, complex components, and difficult decolorization. [0003] The treatment methods of printing and dyeing wastewater can be roughly divided into: (1) Biological treatment method, that is, the use of microbial enzymes to catalyze the degradation of organic molecules, through a series of life activities such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F11/12C02F11/18
Inventor 兰清陈泉源黄璐谢学报
Owner DONGHUA UNIV
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