I would like to know how I should treat my waste water after biological treatment to make it good enough to be used again in bleaching and dyeing. What sort of investment is the best one and most importantly what will be the treatment cost per ton?



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I would like to know how I should treat my waste water after biological treatment to make it good enough to be used again in bleaching and dyeing. What sort of investment is the best one and most importantly what will be the treatment cost per ton? , , Frequently Asked Questions, In order to achieve desired norms I appreciate your views and efforts. My suggestions are as follows: 1) Check the COD ( 1 Gm/Ltr solution) of each chemical which is entering in factory gate. 2) Replace those which are contributing more in COD level 3) The chemicals used in pre-treatment might be contributing more. Try not to discharge ETP hence but set a system to recycle it ( you can easily recycle those drain baths without treatment or with minimum treatment). 4) Try to separate salt from dyeing drains & modern filtration devices will make it colorless. You can easily reuse in soaping or any other washing treatments. 5) Need to take a sample in lab for generating confidence as we have fore sighted fear of spoiling the batches I am sure we can recycle more then 95% of effluent & which can be proven by reduction of water input of factory.


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FAQ > FREQUENTLY ASKED QUESTIONS
I would like to know how I should treat my waste water after biological treatment to make it good enough to be used again in bleaching and dyeing. What sort of investment is the best one and most importantly what will be the treatment cost per ton?
 
Q:
Our textile production output is 4.5 million meters per month and we dye cotton and blends of cotton with polyester, linen, modal, Tencel and nylon for bottoms. We use reactives, vats, pigments and disperse for dyeing in our plant. 
Earlier, I had mentioned that if a company wants zero discharge it is strongly possible but it is necessary, besides biological treatment to control pH and BOD/COD to acceptable level, RO treatment as final step if water is to be reused in processing again. 
We have a waste water treatment plant with the capacity of 250 T/hr. We have one stream of water entering the waste water treatment plant. The water from bleaching, dyeing and finishing (negligible discharge from finishing generally because it is basically padding of softeners, resins and other finishing agents) is mixed and based on my little experience, this is advantageous because average COD from different points vary. Some points show steep levels of COD may be around 3000 and 4000, and some points lower than 1000. However, average COD of waste water stands at 1500-1700 mg/l because we have in house a lab which monitor COD twice a day in coming and out going. 
Since I was in Lahore, Pakistan and our National STD for COD was 150mg/l. I would like to know how I should treat my waste water after biological treatment to make it good enough to be used again in bleaching and dyeing. What sort of investment is the best one and most importantly what will be the treatment cost per ton? 
In addition I would like to know something more about salt recovery system, since reactive dyes require large amount of salt in continuous application.



A:
In order to achieve desired norms I appreciate your views and efforts. My suggestions are as follows: 
1) Check the COD ( 1 Gm/Ltr solution) of each chemical which is entering in factory gate. 
2) Replace those which are contributing more in COD level 
3) The chemicals used in pre-treatment might be contributing more. Try not to discharge ETP hence but set a system to recycle it ( you can easily recycle those drain baths without treatment or with minimum treatment). 
4) Try to separate salt from dyeing drains & modern filtration devices will make it colorless. You can easily reuse in soaping or any other washing treatments. 
5) Need to take a sample in lab for generating confidence as we have fore sighted fear of spoiling the batches 

I am sure we can recycle more then 95% of effluent & which can be proven by reduction of water input of factory.




next: We have three drains, in this case we need to recycle different streams in various processes & need an audit which will lead to reach the maximum recycle of water. Please give details on this issue.


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