Hello Manjunath  It seems ...

Hello Manjunath 

It seems still you are looking at answers. It is good to reduce the principle pollutant at source with resource recovery but tell you there is a limit of 2-6 ppm Cyanide at Blast Furnace and Coke Oven recovery plant and reducing it beyond this range would be a tough task . 

As I indicated earlier that if your sole aim is to nitrify stably in the down stream biological wastewater treatment by minimizing impact of cyanide then you need to look at the whole problem holistically. the source reduction certainly help but 6-8 ppm Cyanide is manageable in biological plant if it is present at site. 

As I understand , at lower pH cyanide will volatilize but then at 400 m3/hr reducing pH to 6-6.5 would be costly and collecting cyanide in air and dispose it of would be another challenge. 

If liquid stream is facing treatment problems due to Cyanide then certainly We can help. You can send us details on levapor.india@gmail.com and We can have a look at the problem. 

Regards

Amit