Process for deeply treating printing and dyeing wastewater in presence of attapulgite catalyst

A technology of printing and dyeing wastewater and attapulgite, applied in the field of environmental engineering, can solve the problems that the treatment method is difficult to meet the requirements of production and environmental protection, the COD removal rate is less than 30%, and the biodegradability of printing and dyeing wastewater is poor, so as to achieve enhanced aerobic biochemical treatment ability and effect, improving the efficiency of biochemical reactions and the ability to degrade organic matter, and improving the effect of biochemical treatment

Inactive Publication Date: 2014-12-10
ANHUI JIANGHAI ENVIRONMENT ENG
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  • Description
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Problems solved by technology

Although the electrochemical method and membrane separation technology have better treatment effects, due to the high investment cost and high operating cost, ordinary enterprises cannot afford them, and they are only suitable for small-scale water applications.
In particular, the biochemical properties of printing and dyeing wastewater after primary biochemical treatment are even worse, and the COD removal rate is less than 30%.
As the country and society pay more and more attention to environmental protection requirements and the requirements for sustainable development, traditional processing methods have become increasingly difficult to meet the requirements of production and environmental protection

Method used

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  • Process for deeply treating printing and dyeing wastewater in presence of attapulgite catalyst

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Experimental program
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Effect test

Embodiment 1

[0024] Implementation steps of advanced treatment of printing and dyeing wastewater in a printing and dyeing factory;

[0025] (1) Use a lift pump to press 150m from the adjustment pool 3 The / h flow rate is pumped into the radial flow coagulation sedimentation tank, and 10% concentration of ferrous sulfate solution and lime milk are added according to 0.3% of the printing and dyeing wastewater. Hydraulic retention time 2h;

[0026] (2) The outlet water of the radial flow coagulation sedimentation tank shall be 150m 3 The / h flow rate is pumped into the anaerobic tank for acidification and hydrolysis, and the hydraulic retention time is 4h;

[0027] (3) The effluent from the anaerobic pool enters the anoxic-aerobic pool containing attapulgite catalyst for treatment, and the dosage of attapulgite catalyst in the anoxic-aerobic pool is 5m 3 . The hydraulic retention time is 24 hours, and the sludge reflux ratio of the biochemical system is 1.0;

[0028] (4) The effluent fro...

Embodiment 2

[0031] Implementation steps of advanced treatment of printing and dyeing wastewater in a printing and dyeing factory;

[0032] (1) Use a lift pump to press 250m from the adjustment pool 3 The / h flow rate is pumped into the radial flow coagulation sedimentation tank, and 10% concentration of PAC is added according to 0.03% of the printing and dyeing wastewater.

[0033] (2) The outlet water of the radial flow coagulation sedimentation tank shall be 250m 3 The / h flow rate is pumped into the anaerobic tank for acidification and hydrolysis, and the hydraulic retention time is 4h;

[0034] (3) The effluent from the anaerobic pool enters the anoxic-aerobic pool containing attapulgite catalyst for treatment, and the one-time dosage of attapulgite catalyst in the anoxic-aerobic pool is 10m 3 . The hydraulic retention time is 24 hours, and the sludge reflux ratio of the biochemical system is 1.0;

[0035] (4) The effluent from the anoxic-aerobic tank enters the secondary sediment...

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Abstract

The invention discloses a process for deeply treating printing and dyeing wastewater in the presence of an attapulgite catalyst. The process comprises the following steps: collecting the printing and dyeing wastewater subjected to biochemical treatment for the first time into an adjusting tank, adjusting the water quantity and the water quality, feeding into a coagulative precipitation tank for coagulative sedimentation treatment, feeding outlet water of the coagulative precipitation tank into an anaerobic tank for acidification and hydrolysis, performing biochemical treatment on outlet water of the anaerobic tank by adopting an anoxic-aerobic tank with the attapulgite catalyst, removing organic matters, chromaticity and ammonia nitrogen, and discharging by standard. According to the process, the attapulgite catalyst is added during the biochemical treatment of the anoxic-aerobic tank, so that the aerobic biochemical treatment capability and effect are improved, the biochemical treatment effect on difficultly treated printing and dyeing wastewater is enhanced, COD (chemical oxygen demand), chromaticity and ammonia nitrogen in the printing and dyeing wastewater are efficiently removed, and the printing and dyeing wastewater is discharged by standard; the treatment cost of the printing and dyeing wastewater is reduced, the process is convenient to perform, and the practical application of engineering and the technical improvement of existing printing and dyeing wastewater treatment engineering are facilitated.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to an attapulgite catalyst advanced treatment process for printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater is wastewater discharged from printing and dyeing factories that mainly process cotton, hemp, silk, wool, chemical fibers and their blended products. Printing and dyeing wastewater has a large amount of water, 100-200 tons of water is consumed per ton of textile printing and dyeing, of which 80-90% becomes wastewater. The printing and dyeing industry is a large discharge of industrial wastewater. According to incomplete statistics, the daily discharge of printing and dyeing wastewater in the country is 3×106 to 4×106 m3. One of the main obstacles to the development of the textile industry is the issue of environmental protection and energy saving (low carbon). The main problem of environmental protection is wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 刘明江杨光海刘明礼刘洋丰勇
Owner ANHUI JIANGHAI ENVIRONMENT ENG
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