A method for improving sludge settling performance during copper-containing wastewater treatment

A sludge settling and wastewater treatment technology, applied in water/sewage treatment, water treatment parameter control, neutralization water/sewage treatment, etc. The effect of low operating cost and simple equipment

Active Publication Date: 2018-08-24
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that sludge is difficult to separate from solid and liquid during the treatment of copper-containing wastewater, the present invention provides a method for improving sludge settling performance during the treatment of copper-containing wastewater (copper ion concentration ≥ 1000mg / L)

Method used

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  • A method for improving sludge settling performance during copper-containing wastewater treatment
  • A method for improving sludge settling performance during copper-containing wastewater treatment
  • A method for improving sludge settling performance during copper-containing wastewater treatment

Examples

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Embodiment 1

[0027] A reaction beaker was placed on a constant temperature magnetic stirrer, and 100 mL of a suspension containing CuO seed crystals (solid concentration: 2.5 g / L) was added thereto. The reaction temperature was controlled at 25° C., and the rotational speed of the magnetic stirring bar was adjusted to 300 rpm. Then dropwise respectively sodium hydroxide solution (0.03mol / L) and copper-containing waste water (copper ion concentration 1100mg / L) in the beaker simultaneously, control the sampling rate of copper-containing waste water and sodium hydroxide solution to be 0.5mL / min, Control the reaction pH to 11.0±0.2 by adding sodium hydroxide solution dropwise, and react for 1 hour. Then add polyacrylamide flocculant with a mass concentration of 1g / L to the suspension after the precipitation reaction is completed, so that the concentration in the system is 15mg / L; then stir at 600rpm for 15s, then stir at 100rpm for 15min, and let stand After 30 minutes, the granular sludge wa...

Embodiment 2

[0029] A reaction beaker was placed on a constant temperature magnetic stirrer, and 100 mL of a suspension containing CuO seed crystals (solid concentration: 2.5 g / L) was added thereto. The reaction temperature was controlled at 25° C., and the rotational speed of the magnetic stirring bar was adjusted to 300 rpm. Then dropwise respectively sodium hydroxide solution (0.03mol / L) and copper-containing waste water (copper ion concentration 1100mg / L) in the beaker simultaneously, control the sampling rate of copper-containing waste water and sodium hydroxide solution to be 4mL / min, by Add sodium hydroxide solution dropwise to control the reaction pH to 11±0.2, and react for 1 hour. Then add polyacrylamide flocculant with a mass concentration of 1g / L to the suspension after the precipitation reaction is completed, so that the concentration in the system is 10mg / L; then stir at 600rpm for 15s, then stir at 100rpm for 15min, and let stand After 30 minutes, the granular sludge was st...

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Abstract

The invention discloses a method for improving the sludge settling property in the copper-containing wastewater treatment process and belongs to the field of environmental engineering. In the chemical precipitation treatment process of copper-containing wastewater, generated sludge is generally flocculent sludge and has poorer stability, settleability and dehydration properties, and the effluent quality and the process operation efficiency are severely affected. A seed crystal is introduced with a reactive crystallization method, the supersaturation degree of a solution is adjusted by controlling the sample feeding speed of a reactant with a parallel flow feeding and continuous operation mode, and the seed crystal solid concentration, the stirring speed, the precipitant concentration, the dropwise adding speed of a precipitant, the reaction pH value and other conditions are regulated simultaneously, so that granular sludge is promoted to be formed, and the settling speed of the sludge is increased by 7-8 times while compared with that of the flocculent sludge; besides, the water content of the sludge is reduced to 71% from 99% of the flocculent sludge, and the volume is reduced by 96.5%. A novel method is provided to solve the problem about solid-liquid separation in the copper-containing wastewater treatment process.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for improving sludge settling performance in the copper-containing wastewater treatment process. Background technique [0002] The chemical precipitation method is widely used in the treatment of copper-containing wastewater due to its advantages of simple method, convenient operation, and mature technology. However, due to the fast precipitation reaction, the generated particles are relatively fine or amorphous, and a large number of fine particles are suspended in the solution, which is difficult to separate quickly and efficiently, making it difficult for the treated wastewater to meet the standard stably. In order to solve this problem, the reaction crystallization method is used in the process of chemical precipitation treatment of copper-containing wastewater to form chemical precipitation granular sludge, which can greatly improve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F1/66
CPCC02F1/5209C02F1/56C02F1/66C02F2001/5218C02F2209/001
Inventor 李青竹柴立元叶丽君颜旭王庆伟闵小波王海鹰
Owner CENT SOUTH UNIV
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