Flow Chart of Biological Treatment of Wastewater In Textile Industry

Biological Treatment Process

Effluent treatment plant are used to treat waste water that comes from different manufacturing industries where different types of chemicals and dyes are used to treat the materials. After treatment, waste water is directly discharged into the environment. This waste water is harmful to the environment. The purpose of biological treatment of wastewater is to protect the environment from the harmful effects of waste water, an effluent treatment plant is used where waste water is treated and is not harmful to the environment.

In the textile industry, different types of dyes and chemicals are used in weaving, dyeing and garment washing plants. This waste water is treated at an effluent treatment plant. Here I will give an idea of the biological waste water treatment plant. In the dyeing process, waste water is discharged from scouring, bleaching, washing, and dyeing. These dyes and chemicals are supplied to the biological water treatment plant for purification.

In Bangladesh, a lot of dyeing and textile industries have been established for processing textile products. To protect the environment from the harmful effects of the waste water, the Department of Environment, Government of Bangladesh, fixed the following parameters for the waste water that will be discharged into 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 that is produced in the dyeing industry may have the following characteristics:

  • PH: 9-11
  • BOD: 300 mg/l
  • COD: 200 mg/l
  • Suspended solid: 200 mg/l
  • Color: Dark

Flow Chart of Biological Treatment of Wastewater In Textile Industry

After treatment, the characteristics of the waste water changed as follows

  • PH: 7-8
  • BOD: 30 mg/ L
  • COD: 60 mg / L
  • Suspended solid: 30mg/L
  • Color: Light brownish
Biological Treatment of Wastewater

Process flow chart of biological wastewater treatment plant:

Effluent comes in collection tank

Equalization tank (Cooling & Mixing)

Primary clarifier tank (Neutralization)

Aeration tank

Secondary clarifier (Tank 1 & 2)

Sludge return to aeration tank

Thickness filter

Fish pond


So, that’s all about the biological treatment of industrial wastewater. If you have better idea lets me know about it.

72 thoughts on “Flow Chart of Biological Treatment of Wastewater In Textile Industry”

  1. An ETP is under construction in Litun Fabrics Ltd. All technical and fabrication data are required to do the job properly.

  2. Dear sir ; pls send me basic fundamental of biological and also work of lime . Ferrous . Poly . Oregano plus plus . And their properties and reaction with effluent. Thank you very much sir

  3. i am taim khan. i am works in e.t.p (biological)&w.t.p of purbani group. i know all test e.t.p & w.t.p. i bbuild up my carrear this job. so i nneed a perrfect job please anyyone help me.leave in gazipur, dhaka,bangladesh.
    phone no 8801718829442

  4. 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….

  5. 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.
    Bangladesh Hub

    • 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?

  6. Hi,I am Ruhul amin from Rajshahi I am completed Diploma in Environmental Technology.Now working at effluent treatment plant and water treatment plant.i can that water parameter ph.Tds.Do.Th.Bod.cod.etc but I went a environment related jobs so please help me anyone.please contact me 01725020389

  7. Am student in M.sc Microbiology from Periyar university,i choosing my M.sc final year project topic is PAPER EFFLUENT OF WATER TREATMENT (dye degrading method).but, now am confused for the methodology,so please anybody help the project methodology..please help me,send methodology from this mail id surendiranmsc@yahoo.com
    Thank you……….

  8. This is Mehdi hasan sumon. Working near about 5 years with biological ETP Plant. Want to admit an excellent working facilities.

  9. Dear All,
    we have been applied Boi-Chemical ETP. Capacity 50m3/hr since 2010 to till on operation condition, At present will prepared to Extend Capacity 120m3/hrs. but additional space is limit (app: 2100 Sft).
    Would like to proper advice regarding apply modern technology , low operational cost , maintain proper parameter etc.

    Thanks and Best regards

  10. This is Azad hossain from Gazipur, I am working as a maintenance manager, thank u very much for these very helpful feature , may I know something more about your product, such as how sizes spaces u need for 100 m3 /hr capacity ETP, & what type of chemical (if any) do need to run it & its consumption, Thanks

  11. I am Khairuzzaman, Working BEPZA Environmental Testing Lab, I have Passed M.Sc in Microbiology from Jagannath University. now I want to a high rich job in WTP or ETP . Cell 01710532989

  12. I am Arif Hossain
    I am completed my diploma engineering in mechanical technology now I am work wast water system in chamical etp plant,I want know about biological plant,please any help me about it.

  13. I am completed diploma in environmental technology. I also working at ETP & WTP.
    I know manually and digital parameters all water test ETP and WTP. I also know Environmental issue Bangladesh standard waste water from industrial surface water ECR 1997 and Environmental low 2003. I buildup my career this field… now I am working at DBL group biggest ETP it is 7500 m3 per day..I am working ETP technician post. any big offer for me..plz 01750951580

    • Hello
      I am Mohammad Shuvo. I work at Effluent Treatment Plant a reputed garments factory. My job designation Executive Environment and my jobs responsibility is Environmental Compliance, Environmental Clearance Certificate, Environmental All Project, Energy & GHG,Higg Project , Sipp Project, Waste management, Chemical Management, Effluent Treatment Plant(ETP)Operation ,ETP Cost Analysis, Environmental Health & Safety, Waste Water Test, Risk Assessment etc. I’m saying my job Experience ETP is Emergency issue in our country . Most of the buyers and Department of Forest Sought 100% proper functional ETP all factory. One of the best functional Plant is Biological Plant but some problem for Biological Plant i means operational problem this problem solve with qualified person. Who can take care ETP operation properly in your Plant. I am in this field for last 3 years till now. I want to Develop my self in this field. If any one need help about Biological and Chemical ETP please be inform me.

      Mail : mdshuvo9999@gmail.com
      Contact Num: 01672756947,01723802686

  14. Md. shafiqul Islam manik. job:MICRO FIBRE GROUP. I am ETP/WTP and BOILER inch:/asst: engr: at group.I am tell now 9 years. CONTACT Num : 01712004612

  15. I am Nasiruddin. I am complited Dploma in Environmentl Techonology.I am a sub assistant engineer in Padma Bleaching & Dyeing Ltd.I also working at ETP & WTP.I build up my carrear this job.so i need perfect job plz help me..01939133691 andm gmail nasir900uddin@gmail.com

  16. This lecture is so much needed for students also the owner who plans to established a garments factory.. and one thing to admin your lectures we can not copy.. but i need it.. if u can, plz send in my email.. thanking — shahadat

  17. Res sir
    I am working on innovative textiles Ltd for ETP RO MEE plant for the post of chemist and operation

    But now looking at the job 9049756874

  18. Hi, I am sultan mahmud chand mia. working in a physico-bio-chemical etp as a asst. in-charge from 2010. I am from general student. passed H.S.C in 2005. looking a college or university for academic certificate in etp. anyone here can help me?
    It’s me- 01755109667.

  19. hello I am Md Saiduzzaman. I am complited Diploma In Environmental Technology.I built up my carrear this job. presently I am searching good job ETP/WTP .Now I work Padma bleaching & dyeing limited. So plz help me. Phone 01969228965 Email msaiduzzaman99@gmail.com

  20. We have the solution for Textile ETP plant which is very advanced solution.
    please send me your Letter of intent to Director Intl sales dev@provivatech.com
    1MLD Plant will be cost $2M . The out put water can be reused safely .


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