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Method for treating low-temperature and low-turbidity sewage by PAC

A low turbidity and sewage technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of easy floating, reduction of floc formation speed and sedimentation speed, and reduced probability of particle collision

Inactive Publication Date: 2019-06-07
SICHUAN QINGHE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The flocs produced by polyaluminum chloride coagulation are easy to float after being placed for a period of time; as the water temperature decreases, the viscosity of the water increases, and the floc formation speed and sedimentation speed both decrease; in addition, when treating low-turbidity sewage, the flocculation process The probability of particle collision is reduced, which affects the coagulation effect

Method used

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  • Method for treating low-temperature and low-turbidity sewage by PAC
  • Method for treating low-temperature and low-turbidity sewage by PAC
  • Method for treating low-temperature and low-turbidity sewage by PAC

Examples

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Effect test

Embodiment 1

[0035] A method for PAC to treat low-temperature, low-turbidity sewage. The volume of sewage to be treated is 10L, ammonia nitrogen content is 6mg / L, total phosphorus content is 2mg / L, COD content is 100mg / L, temperature is 1℃, and turbidity Is 100 degrees.

[0036] Firstly, adjust the pH to maintain the pH value of the sewage to be treated between 6.0-9.0. Peracid can be added with a mass ratio of 30% sodium hydroxide solution, and overalkali can be added with a volume ratio of 30% dilute sulfuric acid.

[0037] Add zeolite powder of 200 meshes according to the dosage of 0.8g / L, and stir at 150r / min for 1h.

[0038] Add kaolin with a mesh size of 300 mesh according to the dosage of 0.4g / L, and stir at 60r / min for 1min.

[0039] Add polyaluminum chloride powder while stirring at a rotation speed of 60r / min. The dosage is 0.8g / L, and let it stand until the flocs settle completely.

Embodiment 2

[0041] A method for PAC to treat low-temperature, low-turbidity sewage. The volume of sewage to be treated is 10L, ammonia nitrogen content is 4mg / L, total phosphorus content is 1mg / L, COD content is 85mg / L, temperature is 15℃, turbidity Is 50 degrees.

[0042] Firstly, adjust the pH to maintain the pH value of the sewage to be treated between 6.0-9.0. Peracid can be added with a mass ratio of 30% sodium hydroxide solution, and overalkali can be added with a volume ratio of 30% dilute sulfuric acid.

[0043] Add zeolite powder of 180 mesh at a dosage of 0.6g / L, and stir for 1h at a speed of 100r / min.

[0044] Add kaolin with 300 meshes according to the dosage of 0.3g / L, and stir at 60r / min for 1min.

[0045] Add polyaluminum chloride powder while stirring at a rotation speed of 60r / min, the dosage is 0.6g / L, and let it stand until the flocs settle completely.

Embodiment 3

[0047] A method for PAC treatment of low-temperature, low-turbidity sewage. The volume of sewage to be treated is 10L, ammonia nitrogen content is 5mg / L, total phosphorus content is 1mg / L, COD content is 60mg / L, temperature is 10℃, turbidity Is 90 degrees.

[0048] Firstly, adjust the pH to maintain the pH value of the sewage to be treated between 6.0-9.0. Peracid can be added with a mass ratio of 30% sodium hydroxide solution, and overalkali can be added with a volume ratio of 30% dilute sulfuric acid.

[0049] Add zeolite powder of 190 mesh according to the dosage of 0.7g / L, and stir at 120r / min for 1h.

[0050] Add 250 mesh kaolin according to the dosage of 0.25g / L, and stir at 60r / min for 1min.

[0051] Add polyaluminum chloride powder while stirring at a rotation speed of 60r / min, the dosage is 0.5g / L, and let it stand until the flocs settle completely.

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Abstract

The invention discloses a method for treating low-temperature and low-turbidity sewage by PAC, which comprises the following steps: adjusting the pH value of to-be-treated sewage to maintain the pH value of the to-be-treated sewage between 6.0 and 9.0; adding zeolite powder into the to-be-treated sewage, and stirring the sewage for 1 hour underwater at the rotating speed of 100-150 r / min; adding kaolin into the to-be-treated sewage, and stirring the sewage for 1 minute underwater at the rotating speed of 60 r / min; adding polyaluminum chloride while stirring the sewage at the rotating speed of60 r / min, and standing the sewage until the floc is completely settled. Zeolite powder is added into the sewage with rapid stirring, so that ammonia nitrogen in water can be removed, dissolved oxygenis increased, meanwhile, the total alkalinity of a water body is improved, and the water quality is stabilized. Kaolin is used as a coagulant aid and is added into water firstly, so that the effectivecollision probability among particles is increased, suspended solids in water are coagulated quickly after polyaluminum chloride is added, compact floc is formed, and alum floc is large in mass and high in settling speed.

Description

Technical field [0001] The invention belongs to the technical field of chemical flocculation sewage treatment, and specifically relates to a method for PAC treating sewage with low temperature and low turbidity. Background technique [0002] With the acceleration of the process of urbanization and industrialization in my country, the problem of water pollution has become increasingly prominent, which has severely affected the production and life of the people. At present, the methods of sewage treatment include physical, chemical, and biological methods. Coagulation is one of the important methods in the chemical treatment of sewage. The principle is to add a coagulant to the wastewater to destabilize the colloids and fine suspended substances, and aggregate them into alum flowers of hundreds of microns or even millimeters. , And then can be removed by gravity sedimentation or other solid-liquid separation means. [0003] Poly aluminum Chloride (Poly aluminum Chloride) code name ...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 任洁简龙骥向文良庞凯宋菲菲
Owner SICHUAN QINGHE TECH
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