Odour problem in ETP of an onion processing plant

We have onion processing pant and it;s effluent treatment plant. Our major problem is there is foul smell is comming from aeration tank after contineous running of the blowers. Also the water coming out from aeration clarifier is having turbidity.

Inlet cod is 800 to 1000

Bod 400 to 600

Currently we are using EM solution but not getting proper results 

 

Pl advice 

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