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.
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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
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