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Silicon removal agent and silicon removal and hardness removal sewage treatment system and method

A sewage treatment method and technology of sewage treatment system, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of low soluble silicon removal efficiency, high reaction temperature requirements, The gel is not easy to settle and other problems, so as to achieve the effect of enhancing the flocculation and separation effect, increasing the specific gravity of the floc and prolonging the storage time.

Pending Publication Date: 2020-11-06
SHANGHAI LANKE PETROCHEM ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the system uses magnesium agent to remove silicon and precipitation method to remove hardness, which will generate a large amount of sludge. In addition, the direct use of tubular membrane for filtration has high energy consumption and easily causes membrane clogging, which increases the cost of use.
[0007] Chinese patent document CN201410844954.0 discloses a method and device for treating silicon-containing wastewater. By adding lime and other agents as a coagulant, cationic polyacrylamide as a coagulant, and magnesium salt as a nucleating agent, the multistage mixing Combined with the method of condensing and removing silicon, it mainly solves the problem of SiO 2 The gel is not easy to settle and the residual turbidity is high, but this method has low removal efficiency for soluble silicon in wastewater, and the silicon content in the effluent is still around 50 mg / L
However, the reaction process is at 90-100°C, and the requirements for the reaction temperature are relatively high.

Method used

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  • Silicon removal agent and silicon removal and hardness removal sewage treatment system and method
  • Silicon removal agent and silicon removal and hardness removal sewage treatment system and method
  • Silicon removal agent and silicon removal and hardness removal sewage treatment system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] For a sewage treatment plant reverse osmosis concentrated water containing silicon 156mg / L (SiO 2 ), hardness 50mg / L, adopt technical solution of the present invention to process:

[0086] S1. Add 200 mg / L silicon remover through the pipeline mixer; in the silicon remover, the mass fraction of the active agent is 76%, the modifier is 20%, and the stabilizer is 4%, so that the silicon remover is mixed with the waste water; And wherein the active agent is sodium metaaluminate, the modifier is calcium oxide powder, and the stabilizer is sodium hydroxide;

[0087] S2. After mixing evenly, enter the silicon removal tank, adjust the pH to 9, stir and react at 40°C, and the residence time is 10min;

[0088] S3, the reacted water enters the coagulation tank, and 50mg / L of ferric chloride is added as a coagulant, and the residence time is 15min;

[0089] S4. The reacted water enters the flocculation tank through the bottom of the first partition, and 2mg / L PAM is added as a fl...

Embodiment 2

[0100] For a high-density pool effluent containing silicon 90mg / L (SiO 2 ), hardness 560mg / L, adopt technical solution of the present invention to process:

[0101] S1. Add 100 mg / L silicon remover through the pipeline mixer. In the silicon remover, the mass fraction of the active agent is 72%, the modifier is 25%, and the stabilizer is 3%, so that the silicon remover is mixed with the waste water; In addition, sodium metaaluminate is used as the active agent, and aluminum chloride accounting for 3 wt% of sodium metaaluminate is added to the sodium metaaluminate; calcium oxide powder is used as the modifier; sodium hydroxide is used as the stabilizer;

[0102] S2. After mixing evenly, enter the silicon removal tank, adjust the pH to 8.5, stir and react at 30°C, and the residence time is 10min;

[0103] S3. After the reaction, the water enters the coagulation tank, and 300mg / L lime and 300mg / L sodium carbonate are added as the hardening agent, and the pH is adjusted to 10.4, a...

Embodiment 3

[0115] For a certain high-density pool effluent containing silicon 70mg / L (SiO 2 ), hardness 560mg / L, adopt technical solution of the present invention to process:

[0116] S1. Add 100 mg / L silicon remover through the pipeline mixer, and mix the silicon remover with wastewater; in the silicon remover, the mass fraction of the active agent is 85%, the modifier is 10%, and the stabilizer is 5%; The desiliconization agent is mixed with waste water; wherein the active agent is sodium metaaluminate, and aluminum sulfate accounting for 5wt% of sodium metaaluminate is added to the sodium metaaluminate; the modifier is magnesium oxide powder; the stabilizer is sodium hydroxide ;

[0117] S2. After mixing evenly, enter the silicon removal tank, adjust the pH to 10.5, stir and react at 20°C, and the residence time is 30min;

[0118] S3. After the reaction, the water enters the coagulation tank, add 300mg / L lime and 300mg / L sodium carbonate as the hardening agent, adjust the pH to 11, ...

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Abstract

The invention discloses a silicon removal agent, which comprises the following components in percentage by mass: 70-85% of an active agent, 10-30% of a modifier, and 3-5% of a stabilizer, wherein theactive agent comprises sodium metaaluminate and further comprises aluminum chloride and / or aluminum sulfate, the modifier is magnesium oxide powder and / or calcium powder, and the stabilizer is sodiumhydroxide and / or sodium carbonate. The invention also provides a sewage treatment system for removing silicon and hardness, and provides a sewage treatment method for removing silicon and hardness. When the silicon removal agent is used for sewage treatment, the operation is simple and convenient, the sludge yield is low, the wastewater hardness is not increased, and the silicon removal efficiencyis improved; and in combination with the hardness removal step, wastewater with high hardness can be synchronously treated, and the hardness removal efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a silicon removing agent and a sewage treatment system and method for removing silicon and hardness. Background technique [0002] Silicon often exists in the form of silicate in molecular state, ion state, colloidal state or solid state in industrial wastewater. Silicate is a substance that is easy to scale. If the content of silicate in the wastewater is high without effective treatment, scaling will occur in subsequent equipment, resulting in equipment blockage, water failure to meet the standard and other risks, increasing labor intensity and operating costs. Therefore Silicon removal is very important in the wastewater treatment process. [0003] Silicon removal methods include coagulation precipitation method, ion exchange method, electrocoagulation method and so on. The coagulation sedimentation method is a physical and chemical method that uses the adsorption or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F9/04C02F101/10
CPCC02F1/5236C02F1/5281C02F1/56C02F1/66C02F5/02C02F5/06C02F2101/10C02F2301/08
Inventor 杨秀梅朱洪池剑亭王日彩马洪玺
Owner SHANGHAI LANKE PETROCHEM ENG & TECH
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