High efficiency bio-augmentation treatment method for printing and dyeing wastewater

Abstract

The invention discloses a method for high-efficiency biological strengthening treatment of dye printing wastewater and belongs to the field of dye printing wastewater treatment. The method comprises the following steps: the pretreated dye printing wastewater enters an anoxic zone of a high-efficiency A / O pool through a self-flowing mode or a water pump lifting mode; the wastewater enters an aerobic zone through the self-flowing mode; the wastewater treated in the aerobic zone enters a settling zone through the self-flowing mode; and the water treated in the settling zone enters a subsequent treatment unit through the self-flowing or water pump lifting mode or is discharged. The method has good treatment effect to substantially improve the outlet water quality. Moreover, the method has theadvantages of small occupied area, little sludge amount, stable treatment effect, low operating expense and the like. The method realizes effective treatment of the dye printing wastewater and solvesthe prior problems of dye printing wastewater.

Description

technical field

[0001] The invention relates to a treatment method for printing and dyeing wastewater, in particular to a method for treating printing and dyeing wastewater by using high-efficiency biological enhancement technology. Background technique

[0002] Printing and dyeing wastewater is composed of various processing procedures of printing and dyeing factories, materials lost in the production process, and sewage that washes the ground. Its characteristics are: the amount of wastewater is large, generally up to 70% to 90% of the water consumption of printing and dyeing wastewater manufacturers; the wastewater has high chroma and complex composition, and its organic components are mostly aromatic hydrocarbons and heterocyclic compounds, which contain various obvious Chromophores and polar groups, and may also be mixed with various halogenated compounds, anilines, phenols and various additives; the chemical oxygen demand (COD) is relatively high, while the biochemical...

Examples

Embodiment 1

[0021] After pretreatment, the wastewater from a printing and dyeing enterprise enters the high-efficiency A / O pool through the water inlet pipe (self-flowing or pumping) after being hydrolyzed and acidified in a self-flowing way. The COD is 464.4mg / L, and the NH 3 -N is 35.34mg / L, TN is 42.33mg / L, TP is 6.1mg / L, and the chromaticity is 260 times. Add methanol to it, the dosage of methanol is 20~30mg / L in the front section, and 20~30mg / L in the back section. The dosage in the oxygen zone 2 / 3 is mg / L. The high-efficiency A / O pool adopts 100% external return (through the external return pipe) and 300% internal return (through the internal return pipe). Stirrer power is 12W / m 3 , the wastewater treated in the anoxic zone enters the aerobic zone, and the dosage of powdered activated carbon is 50mg / L. The residence time is 20h. Aeration (provided through the aeration tube) is provided according to the air-water ratio of 20:1. The wastewater treated in the aerobic zone enters t...

Embodiment 2

[0023] Other operations are as in Example 1. But do not add powdered activated carbon. The effluent quality COD is 178.3mg / L, NH 3 -N is 3.34mg / L, TN is 12.6mg / L, TP is 1.2mg / L, and the chromaticity is 120 times.

Embodiment 3

[0025] Other operations are as in Example 1. But methanol is added in the front section once. The effluent quality COD is 154.4mg / L, NH 3 -N is 3.34mg / L, TN is 32.4mg / L, TP is 0.9mg / L, and the chromaticity is 80 times.

[0026] Example 3

[0027] Other operations are as in Example 1. But the internal reflux ratio is 200%. The effluent quality COD is 144.4mg / L, NH 3 -N is 2.34mg / L, TN is 28.4mg / L, TP is 1.2mg / L, and the chromaticity is 90 times.

technical field

[0001] The invention relates to a treatment method for printing and dyeing wastewater, in particular to a method for treating printing and dyeing wastewater by using high-efficiency biological enhancement technology. Background technique

[0002] Printing and dyeing wastewater is composed of various processing procedures of printing and dyeing factories, materials lost in the production process, and sewage that washes the ground. Its characteristics are: the amount of wastewater is large, generally up to 70% to 90% of the water consumption of printing and dyeing wastewater manufacturers; the wastewater has high chroma and complex composition, and its organic components are mostly aromatic hydrocarbons and heterocyclic compounds, which contain various obvious Chromophores and polar groups, and may also be mixed with various halogenated compounds, anilines, phenols and various additives; the chemical oxygen demand (COD) is relatively high, while the biochemical...

Examples

Embodiment 1

[0021] After pretreatment, the wastewater from a printing and dyeing enterprise enters the high-efficiency A / O pool through the water inlet pipe (self-flowing or pumping) after being hydrolyzed and acidified in a self-flowing way. The COD is 464.4mg / L, and the NH 3 -N is 35.34mg / L, TN is 42.33mg / L, TP is 6.1mg / L, and the chromaticity is 260 times. Add methanol to it, the dosage of methanol is 20~30mg / L in the front section, and 20~30mg / L in the back section. The dosage in the oxygen zone 2 / 3 is mg / L. The high-efficiency A / O pool adopts 100% external return (through the external return pipe) and 300% internal return (through the internal return pipe). Stirrer power is 12W / m 3 , the wastewater treated in the anoxic zone enters the aerobic zone, and the dosage of powdered activated carbon is 50mg / L. The residence time is 20h. Aeration (provided through the aeration tube) is provided according to the air-water ratio of 20:1. The wastewater treated in the aerobic zone enters t...

Embodiment 2

[0023] Other operations are as in Example 1. But do not add powdered activated carbon. The effluent quality COD is 178.3mg / L, NH 3 -N is 3.34mg / L, TN is 12.6mg / L, TP is 1.2mg / L, and the chromaticity is 120 times.

Embodiment 3

[0025] Other operations are as in Example 1. But methanol is added in the front section once. The effluent quality COD is 154.4mg / L, NH 3 -N is 3.34mg / L, TN is 32.4mg / L, TP is 0.9mg / L, and the chromaticity is 80 times.

[0026] Example 3

[0027] Other operations are as in Example 1. But the internal reflux ratio is 200%. The effluent quality COD is 144.4mg / L, NH 3 -N is 2.34mg / L, TN is 28.4mg / L, TP is 1.2mg / L, and the chromaticity is 90 times.

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