Coagulation method for raw water with low turbidity and low organic matter content

A technology with low organic matter and turbidity, applied in chemical instruments and methods, water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problem of high turbidity of pre-filtered water, easy penetration of filter tanks, and incomplete flocs and other problems, to achieve the effect of reducing the floating amount of flocs, reducing the amount of flocs, and the flocs are light and small

Active Publication Date: 2020-02-04
天津水务集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention focuses on solving the problems of unreliable flocs, more floats, high turbidity of pre-filtered water, and easy penetration of filter tanks caused by poor coagulation effect when the existing process of the waterworks is used to treat source water with low turbidity and low organic matter. The problem is to provide a coagulation method suitable for raw water with low turbidity and low organic matter, clarify the water purifying agent dosing method and coagulation process parameters suitable for source water with low turbidity and low organic matter, and provide guidance for water plant process upgrading. Technical Support

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  • Coagulation method for raw water with low turbidity and low organic matter content
  • Coagulation method for raw water with low turbidity and low organic matter content
  • Coagulation method for raw water with low turbidity and low organic matter content

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Embodiment 1

[0032] The coagulation process of the present invention is suitable for source water with low turbidity and low organic matter. The turbidity of source water with low turbidity and low organic matter of the present invention is lower than 10NTU, and the total organic carbon is lower than 5mg / L.

[0033] (1) FeCl in ferric chloride water purifying agent 3 The mass fraction of ferric chloride is 40%. Add 10 grams of ferric chloride water purifying agent per ton of source water at the ferric chloride dosing point to make FeCl in the source water 3 The content reaches 4mg / L (as FeCl 3 Quickly mix for 0.5 minutes under hydraulic conditions equivalent to 200 r / min. After the ferric chloride in the source water is mixed evenly, the pH is controlled at 7-8.

[0034] (2) Al in polyaluminum chloride 2 o 3 The mass fraction of the polyaluminum chloride is 10%. Add 20 grams of polyaluminum chloride water purifying agent to every ton of water source water at the polyaluminium chloride d...

Embodiment 2

[0039] Adopt the coagulation method of embodiment 1 to process low turbidity and low organic matter source water, its difference is only that the dosage of ferric trichloride is 6mg / L in the step (1), and the dosage of polyaluminium chloride in the step (2) The dosage is 3mg / L.

Embodiment 3

[0041] Adopt the coagulation method of embodiment 1 to process low turbidity low organic matter source water, its difference is only that the dosage of ferric trichloride is 8mg / L in the step (1), and the dosage of polyaluminum chloride in the step (2) The dosage is 4mg / L.

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Abstract

The invention belongs to the technical field of water purification processes, and discloses a coagulation method for raw water with low turbidity and low organic matter content. The method comprises:adding ferric chloride into water source water according to a certain metering ratio, quickly mixing for a certain time, controlling the pH value of the water body after the mixing is completed, adding polyaluminium chloride according to a certain metering ratio, quickly mixing for a certain time, making the mixed water body enter a first-stage flocculation tank, completing first-stage flocculation at a certain rotating speed within a certain time, entering a second-stage flocculation tank, and completing second-stage flocculation tank at a certain rotating speed within a certain time; and making the water body subjected to second-stage flocculation enter a precipitation tank, and entering a clear water tank after being precipitated in the precipitation tank for a certain time. According to the invention, the feeding mode of the water purifying agent for water source water with low turbidity and low organic matter content and the coagulation process parameters are defined, the problemsthat the floc is not compact, the more floc float, the water before filtration is high in turbidity and the water source water easily penetrates through the filtration tank due to the poor coagulation effect when the water source water with low turbidity and low organic matter content is treated by the existing process of the tap water supply plant are solved, and the technical support is provided for upgrading and reconstruction of the process of the water supply plant.

Description

technical field [0001] The invention belongs to the technical field of water purification technology, and in particular relates to a coagulation method suitable for raw water with low turbidity and low organic matter. Background technique [0002] At present, the water purification process of the waterworks is mainly to make the fine suspended particles and colloidal particles gather into coarser particles and settle down to separate from the water by adding water purifiers to purify the water. Among them, the water purifiers mainly include iron salts and aluminum salts. Ferric chloride of iron salts and polyaluminum chloride of aluminum salts are relatively common water purifiers, which are used frequently and often used in water plants. It is designed according to these two water purifiers. [0003] These two water purifiers can play a very good role in treating raw water with general turbidity. However, when dealing with raw water with low turbidity and low organic matte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52
CPCC02F9/00C02F1/5236C02F1/66C02F2001/007
Inventor 张旭东张世红于红玲刘志滨孙丽晶谭浩强
Owner 天津水务集团有限公司
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