Method for forming non-biological granular sludge in heavy metal waste water treatment process

A technology for treating granular sludge and wastewater, applied in the field of environmental engineering, can solve the problems of difficult solid-liquid separation of sludge, and achieve the effects of low reaction period, stable structure and good settling performance.

Active Publication Date: 2013-09-11
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that sludge is difficult to separate from solid and liquid in the current heavy metal wastewater treatment process, th

Method used

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  • Method for forming non-biological granular sludge in heavy metal waste water treatment process
  • Method for forming non-biological granular sludge in heavy metal waste water treatment process
  • Method for forming non-biological granular sludge in heavy metal waste water treatment process

Examples

Experimental program
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Embodiment 1

[0022] The 500mL reaction beaker is placed on a constant temperature magnetic stirring device, the temperature is controlled at 40±1°C, and the stirring rate is adjusted to 400rpm. Add 100 mL of seed material micron-sized SiO to the reaction beaker 2 suspension with a solid concentration of 1.0 g / L. Then drop sodium hydroxide solution (0.015mol / L) and zinc-containing waste water (zinc ion concentration 600mg / L) respectively in the beaker simultaneously, control the drop rate rate of zinc-containing waste water to be 3mL / min, by adjusting sodium hydroxide solution The pH value of the reaction is controlled by the dropping rate of 9.0±0.2, and the reaction is 1h. Add a polyacrylamide (PAM) flocculant with a concentration of 0.1% dropwise to the suspended solution system after the above reaction, so that the reaction concentration is 12 mg / L. Then stir rapidly (500rpm) for 30s, and then stir slowly (50rpm) for 10min. Stand still for 30 minutes to stabilize and completely settl...

Embodiment 2

[0025] Place a 500mL reaction beaker on a constant temperature magnetic stirring device, control the temperature at 60±1°C, and adjust the rotational speed of the magnetic stirring bar to 300rpm. Add 200 mL of a suspension containing nano-ZnO seed crystal material into the reaction beaker, and its solid concentration is 0.5 g / L. Then drop sodium hydroxide solution (0.01mol / L) and zinc-containing waste water (zinc ion concentration 1000mg / L) respectively in the beaker simultaneously, control the dropping rate of zinc-containing waste water to be 2.5mL / min, by adjusting sodium hydroxide The dropping rate of the solution controls the reaction pH value to be 9.5±0.2, and reacts for 1 hour. Add a polyacrylamide (PAM) flocculant with a concentration of 0.1% to the suspension solution system after the above reaction, so that the reaction concentration is 10mg / L. Then stir rapidly (500rpm) for 30s, and then stir slowly (50rpm) for 15min. Stand still for 30 minutes to stabilize and c...

Embodiment 3

[0028] Place a 1000mL reaction beaker on a constant temperature magnetic stirring device, control the temperature at 25±1°C, and adjust the rotational speed of the magnetic stirring bar to 500rpm. Add 100 mL of a suspension containing seed crystal nano-ZnO to the reaction beaker, and its solid concentration is 1.5 g / L. Then drop sodium hydroxide solution (0.01mol / L) and simulated heavy metal wastewater (CZn(II) =500mg / L,C Cu(II) =100mg / L, C Pb(II) =100mg / L, C Cd(II) =100mg / L), control the dropping rate of heavy metal wastewater to 2.5mL / min, adjust the dropping rate of precipitant sodium hydroxide solution, control the reaction pH to 9.0±0.2, and react for 1h. Add a polyacrylamide (PAM) flocculant with a concentration of 0.1% to the suspension solution system after the above reaction, so that the reaction concentration is 10mg / L. Then stir rapidly (500rpm) for 30s, and then stir slowly (100rpm) for 15min. Stand still for 30 minutes to stabilize and completely settle the sl...

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Abstract

The invention discloses a method for forming non-biological granular sludge in a heavy metal waste water treatment process, belonging to the environmental engineering field. Chemical sludge obtained in a heavy-metal-containing waste water treatment process is flocculent suspended state sludge mostly, stability, settleability and dehydration property are poorer, and effluent quality and technology operating efficiency are seriously influenced. Inspired by an induction kernel hypothesis and an extracellular polymeric substance hypothesis for forming the biological granular sludge, an improved parallel flow charging control crystallization process is applied in the invention, a heavy metal precipitation reaction mechanism is changed, and seed crystals and a flocculating agent are added, so that the non-biological heavy metal granular sludge is obtained. The method for forming the non-biological granular sludge has the advantages that an operation cycle is short, a flow path is simple, operation is easy, stability of the heavy metal chemical sludge can be effectively improved, moisture content of settled sludge is reduced by 7-8% compared with common flocculent sludge, and settling rate is increased by 4-5 times.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a method for forming non-biological granular sludge in the process of heavy metal wastewater treatment. Background technique [0002] In the process of heavy metal wastewater treatment, the solid-liquid separation performance of sludge is a very important indicator. If the generated sludge structure is unstable and the sedimentation separation effect is poor, it is easy to cause sludge inversion during subsequent sedimentation and transportation. The heavy metals in the sludge will return to the supernatant, which will increase the concentration of heavy metals and turbidity in the effluent, seriously affecting the treatment effect. [0003] At present, the sludge obtained during the operation of the heavy metal wastewater treatment process has two states, one is flocculent suspended sludge, and the other is biological granular sludge. Flocculent suspended sl...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/56C02F101/20
Inventor 李青竹柴立元颜旭王庆伟闵小波杨卫春
Owner CENT SOUTH UNIV
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