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Textile Printing and Dyeing
Wastewater Treatment

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Industry Issues

Characteristics of Textile Printing and Dyeing Wastewater

High content of organic matter:

Textile printing and dyeing wastewater contains a large amount of organic matter, such as dyes, auxiliaries, residual fiber debris and cotton wadding. These organic matter form complex chemical systems in water, making wastewater treatment relatively complicated.

High chroma and turbidity:

The presence of dyes and colorants makes textile printing and dyeing wastewater have high chroma and turbidity, which increases the difficulty of treatment. Effective removal of these colors and turbidities requires appropriate treatment methods.

Large fluctuations in pH value:

In the textile printing and dyeing process, the use of acidic or alkaline treatment agents may cause large fluctuations in the pH value of wastewater. This requires pH adjustments during treatment to meet emission standards.

Salt and metal ions:

Textile printing and dyeing wastewater may contain salt and metal ions. These substances come from printing and dyeing agents, mordants, dedying agents, etc., which have a negative impact on the environmental safety of the water body.

High-temperature wastewater:

The textile printing and dyeing process may involve high-temperature treatment, resulting in higher wastewater temperatures. This requires consideration of adaptability to wastewater temperature in the treatment.

Mixing of various chemical substances:

There is a mixture of various chemical substances in textile printing and dyeing wastewater, including dyes, auxiliaries, acids and bases, etc. Therefore, a multi-stage treatment process is required to effectively remove these components.

Large fluctuations in water volume and flow:

During the textile printing and dyeing production process, water volume and wastewater flow may fluctuate greatly, which requires the treatment system to have certain adaptability.

Based on the characteristics of textile printing and dyeing wastewater

MBBR Must Have the Following Properties

1

High biological adhesion efficiency

There is a large amount of organic matter in textile printing and dyeing wastewater. The key to MBBR is to provide sufficient surface area to encourage microorganisms to attach and form biofilms. High bioadhesion efficiency helps improve biodegradability.

2

Load impact resistance

The water quality and load of textile printing and dyeing wastewater may fluctuate greatly, and the MBBR system must have strong load impact resistance to adapt to these changes.

3

Ammonia nitrogen removal efficiency

High concentrations of ammonia nitrogen are often present in circulating aquaculture wastewater. MBBR needs to have good ammonia nitrogen removal efficiency to ensure that the ammonia nitrogen concentration in the wastewater is maintained at a safe level.

4

Strong adaptability

The water quality of textile printing and dyeing wastewater may change at any time, and the MBBR system needs to have strong adaptability and be able to cope with constant changes in water quality and load.

5

Flexibility and adjustability

The MBBR system should have a certain degree of flexibility so that it can be adjusted according to different water quality and load conditions. This may involve adding or subtracting fillers, adjusting mixing speed, etc.

6

Low maintenance requirements

Due to the large scale of textile printing and dyeing wastewater treatment, the MBBR system must be designed with low maintenance requirements to reduce operating costs and system downtime.

7

Efficient gas supply system

Textile printing and dyeing wastewater treatment requires sufficient oxygen supply, and the MBBR system must be equipped with an efficient gas supply system to ensure sufficient oxygen transfer on the filler.

8

Comply with emission standards

The MBBR system must comply with relevant emission standards during design and operation to ensure that the treated water quality meets environmental protection requirements.

Features

MBBR and Disc Diffuser Must have Performance

In the textile printing and dyeing process, MBBR and aeration disks are usually key components of the biological treatment system. Through processes such as biodegradation and oxygen transfer, they help to ensure efficient and reliable removal of organic matter and other pollutants.

MBBR (Moving Bed Biofilm Reactor)

High biofilm attachment efficiency: The key to MBBR is to provide sufficient surface area to encourage microorganisms to attach and form biofilms. High biofilm attachment efficiency helps improve biodegradability.
Good gas-liquid mass transfer performance: Sufficient oxygen is required to be transferred to the biofilm in MBBR, so the system must be designed with good gas-liquid mass transfer performance to support the respiration and degradation activities of microorganisms.
Impact resistance: The MBBR system has strong impact resistance in response to fluctuations in water quality and load to ensure stable operation of the system.
Corrosion resistance of filler materials:MBBR fillers must be corrosion-resistant to deal with corrosive substances that may exist in sewage and ensure long-term stable operation of the system.

Disc diffusers

High gas transfer efficiency: The disc diffuser needs to provide sufficient gas transfer to the water to meet the oxygen needs of microorganisms. High gas transfer efficiency helps improve biodegradation.
Uniform gas distribution: The disc diffuser should be able to ensure that the gas is evenly distributed throughout the entire treatment unit to avoid dead zones and ensure that all parts are adequately supplied with oxygen.
Anti-pollution ability: The disc diffuser needs to have a certain anti-pollution ability to prevent the gas transfer efficiency from being reduced due to clogging or covering.
Corrosion resistance: The material of the disc diffuser must be corrosion-resistant to adapt to different water quality conditions and extend its service life.

Textile Printing and Dyeing wastewater treatment

Precautions, Water Process and Parameter Table

Precautions for Textile Printing and Dyeing wastewater treatment

Analysis of wastewater properties: Before formulating a wastewater treatment plan, a comprehensive analysis of the wastewater properties, including the concentration and type of organic matter, dyes, additives, salts, etc., must be conducted to ensure that appropriate treatment processes are used.
Multi-process combination: Due to the complexity of textile printing and dyeing wastewater, a combination of multiple processes is usually required, such as primary treatment, biological treatment, advanced treatment, etc., to ensure the effective removal of various pollutants.
Pretreatment measures:Consider introducing pretreatment measures, such as screening, pH adjustment, sedimentation, etc., to reduce the burden of wastewater on subsequent treatment units.
Prevent odor and sludge disposal: Textile printing and dyeing wastewater may produce unpleasant odor and large amounts of waste sludge. Measures need to be taken to prevent the spread of odors and consider the proper disposal of waste sludge.
Regular monitoring and adjustment: The properties of wastewater may change with changes in the production process. It is necessary to regularly monitor the water quality and adjust the treatment process to ensure the stable operation of the wastewater treatment system.

Special points of Textile Printing and Dyeing wastewater process The process for treating textile printing and dyeing wastewater requires some adjustments to its special water quality and composition. The following are some special points of the textile printing and dyeing wastewater treatment process:

Multi-stage treatment: Textile printing and dyeing wastewater usually contains a variety of organic matter, pigments, dyes, etc., so a multi-stage treatment process is required. Common ones include primary treatment, biological treatment, advanced treatment, etc. to ensure that various pollutants are effectively removed.
Pretreatment: Since wastewater may contain a large amount of suspended matter, particulate matter, fiber debris, etc., pretreatment processes such as screening, sedimentation, etc. can help reduce the turbidity and color of water quality and reduce the burden of subsequent treatment processes.
Specific biological treatment: Use advanced oxidation process, such as ultraviolet oxidation, ozone oxidation, etc., to further degrade refractory dyes and organic matter to improve the treatment effect.
Advanced oxidation process: Circulating aquaculture wastewater treatment processes usually use multi-stage treatment, including physical treatment, biological treatment and chemical treatment at different stages to ensure that the wastewater can be treated comprehensively and effectively.
Depth filtration and membrane separation: 5.The use of depth filtration and membrane separation technology can effectively remove tiny particles, residual dyes, etc., and improve the quality of effluent.
Salt treatment: For possible salt, it is necessary to consider using appropriate treatment processes, such as ion exchange, reverse osmosis, etc.
Resource recovery: Consider resource recovery of waste residue and sludge generated during the treatment process, such as the recovery of organic matter, heat energy, etc.
Regular maintenance: Since the textile printing and dyeing wastewater treatment process involves multiple links, regular equipment inspection and maintenance are particularly important for the stable operation of the system.
Environmental monitoring: Establish systematic online monitoring and environmental monitoring to detect problems in a timely manner and take adjustment measures to ensure that the quality of discharged water meets regulatory requirements.
Regulatory Compliance: Local and national environmental protection regulations should be strictly observed to ensure that wastewater discharge meets corresponding standards.

Textile Printing and Dyeing wastewater treatment process

Screening: Removes large particles of fiber debris and other impurities.
Sedimentation: Reduce the concentration of suspended solids and reduce the burden of subsequent processing.
MBBR bioreactor: Provides efficient biodegradation capability and increases biofilm attachment area.
Aeration system: Ensure adequate oxygen supply and maintain an aerobic environment.
Activated carbon adsorption: Removes residual dyes and organic matter.
Membrane separation: Further remove tiny particles, bacteria, etc., and improve the quality of effluent.
Disinfection: UV disinfection or other suitable disinfection methods to ensure that the effluent meets discharge standards.

Textile Printing and Dyeing wastewater treatment

Typical Parameter

The following is a parameter table of a typical Textile Printing and Dyeing wastewater treatment process. The specific values can be adjusted according to the actual situation:

Satge	Processing unit	Typical parameters	Unit
Solid-liquid separation	Sedimentation tank	TSS	50 - 500 mg/L
Biological treatment	MBBR	COD	30 - 200 mg/L
		NH3-N	2 - 10 mg/L
		NO2-N	< 1 mg/L
		NO3-N	< 10 mg/L
		TN	5 - 30 mg/L
Aeration system	Aeration tank	DO	3 - 8 mg/L
Physical treatment	Filter	TSS	10 - 50 mg/L
Ammonia nitrogen removal	Ammonia nitrogen removal unit	NH3-N	< 1 mg/L
Sterilize	Sterilization equipment	Sterilant concentration	0.5 - 5 mg/L
Water quality monitoring	Monitoring equipment	PH	6.5 - 8.5
		Conductivity	500 - 2000 μS/cm
		Temperature	20 - 30 ℃

For Textile Printing and Dyeing wastewater treatment

A Unique MBBR Model is Recommended

Based on the characteristics of sewage treatment and the experience of previous cooperative customers, the recommendation is our MBBR64 or MBBR7

MBBR37

Size: Φ25*12mm

Hole Numbers: 37

Material: 100% White Virgin HDPE

Densilty: 0.96-0.98g/cm3

Surface Area: >800m2/m3

Dosing Ratio: 15-65%

Membrane-Forming Time: 3-15days

Nitrification Efficiency: 400-1200gNH N/M3d

BOD, Efficiency: 2000-10000g BOD,/M3d

COD5 Efficiency: 2000-15000 gCOD/Md

Applicable Temperature: 5-60C

Life-Span: >20year

MBBR64

Size: Φ25*4mm

Hole Numbers: 64

Material: 100% White Virgin HDPE

Densilty: 0.96-0.98g/cm3

Surface Area: >1200m2/m3

Dosing Ratio: 85%

Membrane-Forming Time: 15-65%

Nitrification Efficiency: 3-15days

BOD, Efficiency: 400-1200gNH4 N/M3.d

COD5 Efficiency: 2000-10000g BOD/M3d

Applicable Temperature: 2000-15000 gCOD5/M3d

Life-Span: 5-60C

Textile Printing and Dyeing wastewater treatment

AquaSust Customer Case

Japanese textile wastewater treatment case

The wastewater treatment station of a textile factory in Osai City, Japan consists of 4 independently operating systems. The total volume of the aeration tank of each system is 5500m3, which is divided into 4 cells and operates in series. The factory used the LINPOR-C/N MBBR process to transform one of the processes from 1990 to 1991. The organic load in the incoming water of this plant is not high, so the amount of carrier filler added in the aeration tank is only 10%. After the transformation, all indicators of the treated effluent have been significantly improved.

Processing case of Hyde Paper Mill in Sweden (Hylte)

It produces 830,000 tons of newsprint per year using DIP and TMP as raw materials. The original treatment system: anaerobic + aerobic, was closed in 2002. Existing treatment system: BAS (biofilm-activated sludge combined process).
Treatment process flow and parameters: one sedimentation tank and one MBBR → aeration tank and one two sedimentation tanks
Flow rate: 20000m/d. COD:82000kg/d. BOD:36000kg/d.
MBBR:2x2,500m(HRT2x6h).
Fill rate: 40%.
Activated sludge tank volume: 2x7500m3 (HRT2x18h).
Each MBBR tank is built in the middle of the activated sludge tank.
process result:
MBBR: removes 50%~70% BOD. BAS: removes 99% BOD and 90% SCOD. The quality of activated sludge is good, with SVI less than 60. Mud production: 0.11kgTSS/kgSCOD. Effluent water quality: BOD less than 10mg/L; SS less than 10mg/L.

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