Electric flocculation silicon removal process and system for silicon-containing wastewater

Abstract

The invention relates to the technical field of silicon-containing wastewater treatment, in particular to an electric flocculation silicon removal process for silicon-containing wastewater. The process comprises the following steps: 1) collecting silicon-containing raw water into a raw water collecting tank, and pumping the silicon-containing raw water in the raw water collecting tank into an electric flocculation device through a gas-liquid mixing pump for electrolytic treatment, then feeding the electrolyzed water body into a sedimentation tank, and conducting standing for layering; (2) discharging lower-layer sediment settled and layered by the sedimentation tank in the step (1), and feeding supernatant liquid settled and layered by the sedimentation tank into a middle water pond for secondary settling; and (3) feeding the supernatant subjected to secondary sedimentation in the middle water pond in the step (2) into a multi-medium filter for filtering, and finally desalting the filtered filtrate for recycling. The electric flocculation silicon removal process for the silicon-containing wastewater is simple to operate, does not need to add chemical agents in the treatment process, avoids secondary pollution to the environment, can be suitable for large-scale treatment, and is high in practicability, and the silicon removal treatment rate is up to 99% or above.

Description

technical field

[0001] The invention relates to the technical field of silicon-containing wastewater treatment, in particular to an electrocoagulation silicon removal process and system for silicon-containing wastewater. Background technique

[0002] With the increasingly stringent national environmental protection policies, zero discharge of factory sewage has become an inevitable trend, and the zero discharge process will inevitably be equipped with a reclaimed water reuse system. Reclaimed water reuse is actually the use of membrane separation technology to remove harmful substances in wastewater. Separation from water, membrane separation is divided into physical membrane and ionic membrane, but no matter what kind of membrane, there are some hard index ranges for the influent water quality such as conductivity, COD, etc. If it exceeds the range, it will easily cause membrane blockage. In severe cases, the reclaimed water reuse system will be completely paralyzed. This a...

Examples

Embodiment 1

[0032] 1) Collect the silicon-containing raw water into the raw water collection tank 1, and then pump the silicon-containing raw water in the raw water collection tank 1 into the softening device 7 to first remove the hardness, so as to ensure that the hardness of the silicon-containing raw water is not higher than 100mg / L;

[0033] 2) Send the water body that has been removed from the hardness in step 1) into the electroflocculation device 2 for electrolytic treatment, and then send the water body after the electrolytic treatment into the sedimentation tank 3 for static stratification; the voltage during the electrolytic treatment is 22v, and the current Density at 55A / m 2 , the electrolytic treatment time is 20min;

[0034] 3) Discharging the lower layer sediment after sedimentation and stratification in the sedimentation tank 3 in step 2), and then sending the supernatant liquid after sedimentation and stratification in the sedimentation tank 3 into the intermediate pool 4...

Embodiment 2

[0043] A process for removing silicon by electrocoagulation of silicon-containing wastewater, comprising the steps of:

[0044] 1) Collect the silicon-containing raw water into the raw water collection tank 1, and then pump the silicon-containing raw water in the raw water collection tank 1 into the softening device 7 to first remove the hardness, so as to ensure that the hardness of the silicon-containing raw water is not higher than 100mg / L;

[0045] 2) Send the water body that has undergone hardness removal in step 1) into the electroflocculation device 2 for electrolytic treatment, and then send the water body after the electrolytic treatment into the sedimentation tank 3 for static stratification; the voltage during the electrolytic treatment is 23v, and the current Density at 58A / m 2 , the electrolytic treatment time is 25min;

[0046] 3) Discharging the lower layer sediment after sedimentation and stratification in the sedimentation tank 3 in step 2), and then sending ...

Embodiment 3

[0056] A process for removing silicon by electrocoagulation of silicon-containing wastewater, comprising the steps of:

[0057] 1) Collect the silicon-containing raw water into the raw water collection tank 1, and then pump the silicon-containing raw water in the raw water collection tank 1 into the softening device 7 to first remove the hardness, so as to ensure that the hardness of the silicon-containing raw water is not higher than 100mg / L;

[0058] 2) Send the water body that has been removed from the hardness in step 1) into the electroflocculation device 2 for electrolytic treatment, and then send the water body after the electrolytic treatment into the sedimentation tank 3 for static stratification; the voltage during the electrolytic treatment is 24v, and the current Density at 605A / m 2 , the electrolytic treatment time is 30min;

[0059] 3) Discharging the lower layer sediment after sedimentation and stratification in the sedimentation tank 3 in step 2), and then sen...

technical field

[0001] The invention relates to the technical field of silicon-containing wastewater treatment, in particular to an electrocoagulation silicon removal process and system for silicon-containing wastewater. Background technique

[0002] With the increasingly stringent national environmental protection policies, zero discharge of factory sewage has become an inevitable trend, and the zero discharge process will inevitably be equipped with a reclaimed water reuse system. Reclaimed water reuse is actually the use of membrane separation technology to remove harmful substances in wastewater. Separation from water, membrane separation is divided into physical membrane and ionic membrane, but no matter what kind of membrane, there are some hard index ranges for the influent water quality such as conductivity, COD, etc. If it exceeds the range, it will easily cause membrane blockage. In severe cases, the reclaimed water reuse system will be completely paralyzed. This a...

Examples

Embodiment 1

[0032] 1) Collect the silicon-containing raw water into the raw water collection tank 1, and then pump the silicon-containing raw water in the raw water collection tank 1 into the softening device 7 to first remove the hardness, so as to ensure that the hardness of the silicon-containing raw water is not higher than 100mg / L;

[0033] 2) Send the water body that has been removed from the hardness in step 1) into the electroflocculation device 2 for electrolytic treatment, and then send the water body after the electrolytic treatment into the sedimentation tank 3 for static stratification; the voltage during the electrolytic treatment is 22v, and the current Density at 55A / m 2 , the electrolytic treatment time is 20min;

[0034] 3) Discharging the lower layer sediment after sedimentation and stratification in the sedimentation tank 3 in step 2), and then sending the supernatant liquid after sedimentation and stratification in the sedimentation tank 3 into the intermediate pool 4...

Embodiment 2

[0043] A process for removing silicon by electrocoagulation of silicon-containing wastewater, comprising the steps of:

[0044] 1) Collect the silicon-containing raw water into the raw water collection tank 1, and then pump the silicon-containing raw water in the raw water collection tank 1 into the softening device 7 to first remove the hardness, so as to ensure that the hardness of the silicon-containing raw water is not higher than 100mg / L;

[0045] 2) Send the water body that has undergone hardness removal in step 1) into the electroflocculation device 2 for electrolytic treatment, and then send the water body after the electrolytic treatment into the sedimentation tank 3 for static stratification; the voltage during the electrolytic treatment is 23v, and the current Density at 58A / m 2 , the electrolytic treatment time is 25min;

[0046] 3) Discharging the lower layer sediment after sedimentation and stratification in the sedimentation tank 3 in step 2), and then sending ...

Embodiment 3

[0056] A process for removing silicon by electrocoagulation of silicon-containing wastewater, comprising the steps of:

[0057] 1) Collect the silicon-containing raw water into the raw water collection tank 1, and then pump the silicon-containing raw water in the raw water collection tank 1 into the softening device 7 to first remove the hardness, so as to ensure that the hardness of the silicon-containing raw water is not higher than 100mg / L;

[0058] 2) Send the water body that has been removed from the hardness in step 1) into the electroflocculation device 2 for electrolytic treatment, and then send the water body after the electrolytic treatment into the sedimentation tank 3 for static stratification; the voltage during the electrolytic treatment is 24v, and the current Density at 605A / m 2 , the electrolytic treatment time is 30min;

[0059] 3) Discharging the lower layer sediment after sedimentation and stratification in the sedimentation tank 3 in step 2), and then sen...

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