Effluent treatment plant is used for treated waste water which is come from different manufacturing industries where different types of chemicals and dyes are used for treated the materials. After treatment, waste water are discharge to the environment directly. This waste water is harm full for the environment. To protect the environment from the harmful effect of the waste water effluent treatment plant is used where waste water is treated and makes is not harmful to the environment.
In textile industry different types of dyes and chemicals are used in weaving, dyeing and garments washing plant. This waste water is treated in effluent treatment plant. Here I will give an idea about the biological waste water treatment plant. In dyeing process waste water is discharge from scouring, bleaching, washing and dyeing. This dyes and chemicals are supplied to the biological water treatment plant for purification.
In Bangladesh; a lots of dyeing and textile industries established for processing textile products. To protect the environment from the harmful effect of the waste water the Department of Environment, Government of Bangladesh fixed the following parameters for the waste water which will discharge in the environment after treatment.
- PH = 6-9
- BOD = 50 mg/L
- COD= 200 mg/L
- Suspended solid = 150 mg/L
- Color = Light brownish.
The waste water which is produced in dyeing industry its characteristics may be as follow:
- PH = 9-11.
- BOD = 300 mg/l
- COD = 200 mg/l
- SS = 200 mg/l
- Color = Dark
After treatment the characteristics of the waste water changed as follow:
- PH = 7-8
- BOD = 30 mg/ L
- COD = 160 mg / L
- Suspended solid = 30mg/L
- Color = Light brownish
Process flow chart of biological waste water treatment plant:
Effluent comes in collection tank
Equalization tank (Cooling & Mixing)
Primary clarifier tank (Neutralization)
Secondary clarifier (Tank 1 & 2)
Sludge return to aeration tank
So, that’s all about the effluent treatment plant. If you have better idea lets me know about it.
72 thoughts on “Flow Chart of Biological Treatment Process In ETP For Textile Industry”
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Dr Md Shohidullah Miah (PhD)
Chairman, Japanese ETP consulting Firm
Director and Coordinator
College of Agricultural Sciences
IUBAT—International University of Business Agriulture and Technology
4 Embankment Drive Road, Sector 10, Uttara Model Town, Dhaka 1230, Bangladesh
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Your vision in the field of ETP is well appriciated. Kindly share your experience in the field of fully bio logical ETP for textile dyeing units. As per my knowledge operating fully bio ETP is very difficult due to change in parameters.
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Equalisation before and after secondary clarifier
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I am a student of textile engineering in DUET.. what is the main process in waste water processing that’s use in industry..Could you inform me ??? i have a new idea to waste water processing…if you kindly inform me those of this process, then i share my knowledge to this….
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Dear Textile Technologist/ Writer of this main article,
I am so sorry to say that you do not have any basic idea regarding waste water chemistry. In 3rd Paragraph of your articles, mentioned the waste water characteristics as like BOD- 300 mg/l and COD-200 mg/l. Do you exactly know what is BOD and what is COD?
The hydrocarbon(e.g. starch) which can be oxidized by micro-organism through their metabolic process can be indirectly measured by BOD. The relationship is if 23 gm oxygen is required to oxidized 12 gm carbon, so if you know the oxygen lost from the water, you can calculate the amount of carbon present in the waste water. Usually BOD is measured for 5 days period or in some cases for 3 days period or some time the ultimate BOD is also calculate.
For your information, the hydro carbon which can be metabolized by bacteria can also be oxidized by Chemical Oxidizer (such as K2Cr2O7, KMn04, H202, 03, etc.). It is also for your information, a good oxidizing agent like dichromate can oxidize 100% of organic carbon but bacteria can not metabolized all hydrocarbon (especially which is known as persistant organic matter, or long chain complex organic matter).
So, the information what I want to give you that COD value can not be less than the BOD value it can be maximum equal for very easily biodegradable compound like cooked rice. But for textile, COD will be at least 1.5 times higher than BOD. Also note, BOD is a term which the ETP designer use rather they use COD and break down it in to two parts. The term which we use at BOD is mentioned as bCOD by them. The formula is
COD= bCOD+ nbCOD where bCOD= biodegradable organic matter and nb COD non biodegradable organic matter.
So, bCOD= COD-nbCOD
I will humbly request you, not to publish any materials in public domain about which you do not have very clear understanding. You are welcome for any quarries.
Please take my sincere apology for this, my intention was not any how to personally attack you.
With Kind Regards,
Kazy Mohammad Iqbal Hossain
Senior Environmental Chemist-Asian Subcontinent
C&A Sourcing International Ltd.
Thanks for the Information and one more thing i want to know that can you tell me about the average costing of the whole E.T.P process to make the water Reusable?
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hello Mr. Mehdi
We mainly deal with bacterial enzyme, which you can use in Biological tank to maintain required BOD, COD & TSS. We are a USA based waste water treatment company selling biological product in Bangladesh through our local agent.
Please let us know, what kind of help you looking for, may be we can help your plant if required.
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