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Printing and dyeing waste water disposal process

A technology for printing and dyeing wastewater and treatment process, which is used in flotation water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. problems, to achieve the effect of convenient operation, energy saving and good adaptability

Inactive Publication Date: 2007-07-11
上海望春花(集团)股份有限公司
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Problems solved by technology

Due to the above reasons, the sewage treatment effect is poor, the treated sewage COD100-150mg / l, chroma 50-120 times (the standard is COD<100mg / l, chroma<50 times), can not meet the standard discharge
[0004] Therefore, on the basis of the original facilities, the process must be adjusted to solve the problem of substandard discharge after sewage treatment

Method used

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  • Printing and dyeing waste water disposal process

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Embodiment Construction

[0023] The following examples will help to understand the present invention, but do not limit the content of the present invention.

[0024] On the basis of the old technology, the following improvements are made:

[0025] 1. Stop the aeration of the contact oxidation tank (C), ie DO=0 mg / l.

[0026] 2. Stop adding activated carbon to the PACT (E) pool, and add some activated sludge.

[0027] 3. Stop the sludge from the secondary settling tank (F) from being discharged into the drying sludge facility.

[0028] 4. In the off-season, the amount of wastewater is small, and the process is converted. After two months, light green floating objects appear on the surface of the anaerobic pool (hydrolysis pool), which is the phenomenon of anaerobic bacteria production and growth. Synchronous monitoring and monitoring After four months of biological microscope inspection, all indicators improved, and after six months, COD and chroma were all up to the standard discharge (COD<100mg / l, ...

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Abstract

The present invention relates to printing and dyeing waste water treating process and features that the printing and dyeing waste water treating process includes the following successive steps: regulating pH value, coagulating air floatation, anaerobic hydrolysis, anoxic treatment, aeration, secondary sludge setting and drying sludge. During the process, the exhaust water after secondary sludge setting is drained to sewer, the sludge after coagulating air floatation is dried and externally transported, the sludge after secondary sludge setting is returned to the aeration step continuously, the excessive sludge is exhausted from the aeration tank to the anaerobic hydrolysis unit for self consumption, and the anaerobic hydrolysis at pH 6.5-8 generates anaerobic bacteria for hydrolysis at temperature from room temperature to 37 deg.c. The present invention has the features of fast propagation of hydrolysis bacteria, high adaptability, etc. and is suitable for treatment of various kinds of printing and dyeing waste water.

Description

Technical field: [0001] The invention relates to the field of environmental protection, in particular to a printing and dyeing wastewater treatment process. Background technique: [0002] The printing and dyeing wastewater produced by assorted colors and printed velveteen is characterized by large water volume, high chroma, and high chemical oxygen demand (COD). Traditional aerobic biochemical processes are usually used to treat printing and dyeing wastewater. The process is as described in Figure 1: After the printing and dyeing wastewater is adjusted to the pH value, the processes of coagulation air flotation, contact oxidation, anoxic, PACT process, and sludge secondary sedimentation are sequentially adopted. , the effluent after sludge precipitation is discharged into the sewer, and at the same time, the sludge is discharged into the sludge drying, and the sludge is transported outside. Among them, after the coagulation and air flotation process achieves the effect, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/66C02F1/52C02F1/24C02F3/30C02F11/12
Inventor 潘孟俊
Owner 上海望春花(集团)股份有限公司
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