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A printing and dyeing wastewater pretreatment method and device

A pretreatment device, a technology for printing and dyeing wastewater, applied in the textile industry wastewater treatment, multi-stage water treatment, water/sewage treatment and other directions, can solve the problems of effluent treatment, large sludge output, etc. The device and method have the effect of convenient operation

Active Publication Date: 2020-06-09
SHAOXING HEQIAO JIANGBIN WATER TREATMENT
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Problems solved by technology

[0004] Currently popular pretreatment methods: biochemical + physical chemical methods, many of which use front-end dosing of FeSO 4 +NaOH, combined with biochemistry, it is generally difficult to treat the effluent to below 200mg / L, and there are also advanced oxidation at the back end, such as Fenton, but the sludge output is large, and the cost per ton of water treatment

Method used

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  • A printing and dyeing wastewater pretreatment method and device
  • A printing and dyeing wastewater pretreatment method and device
  • A printing and dyeing wastewater pretreatment method and device

Examples

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Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1, when actually put into use:

[0062] 1) The wastewater discharged by the enterprise first passes through the grid 1 to remove large particles;

[0063] 2) The grid 1 then enters the regulating tank 2 to make the water quality uniform and even;

[0064] 3) The effluent from the adjustment tank 2 passes through the coagulation tank 3, and 25% FeSO is added 4 and 30% liquid caustic soda, dosage is respectively 500ppm and 300ppm, carries out mud-water separation through primary settling tank 4 again;

[0065] 4) The effluent of the primary sedimentation tank 4 is biochemically treated through the oxidation ditch 5. The residence time of this process section is 45h, and the refractory organic matter is further degraded, and then separated from the mud and water by the secondary sedimentation tank 6;

[0066] 5) The effluent from the secondary settling tank 6 enters the magnetic coagulation tank 7, and polyferron, 1% PAM and magnetic powder, namely Fe, are add...

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Abstract

The invention belongs to the technical field of wastewater treatment, and especially relates to a printing and dyeing wastewater pretreatment method and an apparatus thereof. The printing and dyeing wastewater pretreatment method comprises the following steps: printing and dyeing wastewater enters a grating from a water inlet tube to remove large granule substances; and printing and dyeing wastewater treated by a magnetic coagulation tank flows into a clarification tank to complete wastewater treatment and then is discharged. The printing and dyeing wastewater pretreatment apparatus is suitable for the printing and dyeing wastewater pretreatment method; and the apparatus comprises the grating, an equalizing tank, a coagulation tank, a primary settling tank, an oxidation ditch, a secondary settling tank, the magnetic coagulation tank, the clarification tank and a magnetic separator which are connected through a pipeline. The technical problem to be solved in the invention is to provide the printing and dyeing wastewater pretreatment method and the apparatus thereof, with the advantages of simple structure and effective removal of CODs.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a method and device for pretreatment of printing and dyeing wastewater. [0002] technical background [0003] Printing and dyeing enterprises are large dischargers of industrial wastewater, which has the characteristics of large water volume, high content of organic pollutants, deep color, high alkalinity, and large changes in water quality. It is difficult to treat industrial wastewater. At present, the commonly used printing and dyeing wastewater treatment processes in China are mainly divided into two categories: one is physical and chemical methods, and the other is biochemical methods. In recent years, a large amount of refractory biodegradable organic substances such as PVA pulp, rayon hydrolyzate (mainly phthalic acid substances), new additives, etc. have entered the printing and dyeing wastewater, and the traditional biological treatment process has been seve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/30
CPCC02F1/001C02F1/488C02F1/5245C02F3/1257C02F9/00C02F2001/007C02F2103/30C02F2201/002C02F2301/08
Inventor 丁静王阳
Owner SHAOXING HEQIAO JIANGBIN WATER TREATMENT
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