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Water treatment combination coagulant and combination coagulating method thereof

A coagulant and water treatment technology, applied in the field of water treatment, can solve problems such as poor coagulation effect

Inactive Publication Date: 2008-05-07
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a compound coagulant for water treatment and its compound coagulation method, which effectively solves the traditional problem of poor coagulation effect caused by low raw water turbidity and excessive algae reproduction.

Method used

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  • Water treatment combination coagulant and combination coagulating method thereof
  • Water treatment combination coagulant and combination coagulating method thereof
  • Water treatment combination coagulant and combination coagulating method thereof

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Embodiment Construction

[0039] The specific implementation and processing results of the present invention will be further described below in conjunction with the accompanying drawings.

[0040] When the source water temperature is between 10°C and 20°C, the turbidity is below 9.0NTU, and the oxygen consumption is below 3.5mg / L, the raw water has the characteristics of low turbidity water. The optimization method of compound enhanced coagulation is: under the rapid stirring of 150-300r / min, first add the inorganic polymer coagulant PAFC, and then add the inorganic coagulant FeCl after 5s-20s 3 , continue to stir rapidly for 120s~150s, then switch to slow stirring at 30~50r / min, stop stirring after continuing for 10~20min, and let the formed flocs settle. The mass ratio of the two coagulants PAFC:FeCl 3 In the range of 3:1~1:6, there is no need to add HCA coagulant aid.

[0041] Summer enters the high algae period, the water temperature is above 20°C, the algae blooms in large numbers, the algae cou...

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Abstract

The invention relates to water treatment compound coagulant and a compound flocculation method thereof. The compositions and the content of the water treatment compound coagulant are: 1 to 3 shares of PAFC, 1 to 6 shares of FeCl3, and 0 to 0.3 milligrams of HCA per liter of water. The compound flocculation method of the water treatment compound coagulant follows the following steps: under quickly stirring in 150 to 300 revolutions per minute, 1) firstly the inorganic macromolecule coagulant PAFC is added; 2) after 5 seconds to 20 seconds, and then the organic coagulant FeCl3 is added; 3) after continuously quick stirring for 30 seconds to 60 seconds, and then cation macromolecule coagulant aid HCA is added; and 4) after still quick stirring for 60 seconds to 90 seconds, and then slowly stirring in 30 to 50 revolutions per minute, and stopping after 10 to 20 minutes to settle the flocculation. The compound enhanced flocculation proposal of the invention not only solves the problem of the former traditional technology that water has large chrominance and high residue turbidity after adding iron salt, but also improves the defects of light alum and slow settling after singly adding PAFC.

Description

technical field [0001] The invention belongs to water treatment technology, and in particular relates to a compound coagulant for water treatment and a compound coagulation method thereof. Background technique [0002] Low turbidity source water contains less particles and colloidal substances, and a small amount of coagulant can reach the isoelectric point of electrical neutralization. Therefore, the formed flocs are small and loose, and it is difficult to effectively settle. The massive reproduction of algae will also block the filter tank, penetrate the filter bed, deteriorate the water quality, cause the water to produce peculiar smell, increase the formation of disinfection by-products in the disinfection process, and release algae toxins to threaten human health. Increasing the dosage of coagulant is currently the most commonly used measure to effectively improve the coagulation effect in water plants, but the treatment effect is not obvious. When FeCl 3 When the do...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 孙井梅李峰赵新华刘志强黎荣
Owner TIANJIN UNIV
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