Case study     FoodAdditivesWastewater
Start Up       March2014
Capacity       300m3/d
Location       TianjinChina

Overview
Unilever’s  headquartered  is  in  Holland,  Rotterdam  and
London, UK, it is a multinational company engaged in food and detergent business.
Unilever Tianjin industrial park secondary project is located in  the  Tianjin  Airport  Economic  Zone,  the  products including the chicken powder, salad sauce, and the annual
production capacity is over 100 thousand tons.

This plant design capacity is 300m3/d, It is used to treat the waste water which discharged from the production process, and the effluent could be promoted to local criteria.

Challenge
The Inlet and outlet values of the WWT plant as follows:

Solution

Two stage A/O MBBR bio-film process for treating the high ammonia wastewater, first aerobic stage, the nitrifying bacteria transforms the ammonia nitrogen to nitrate nitrogen. Then the liquid of O1 tank be pumped   back to the A1 process, denitrification using the carbon source from the influent. Next, adding carbon source in the A2 tank for denitrification. The residual carbon source could be further oxidation in the O2 tank.

Flow Chart of the Process：

Results

Two stage A/O MBBR bio-film process was successfully started up in mid May 2014. Performance testing was a success, Bio-film where attached in the BioCell media grow very well. And the system meets the effluent design criteria.