Solution Cases: Food Additives Wastewater Solution 300 m³/d Capacity
Solution Case: Food Additives Wastewater
Start Up: March 2014
Capacity: 300 m³/d
Project Overview
Unilever's headquartered is in Holland, Rotterdam and London, UK, it is a multinational company engaged in the food and detergent business.
Unilever Tianjin Industrial Park secondary project is located in the Tianjin Airport Economic Zone, the products include chicken powder, and salad sauce, and the annual production capacity is over 100 thousand tons.
This plant's 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:
| Parameter | Unit | Inlet Values | Outlet Values |
| COD | mg/L | 3000 | 50 |
| BOD5 | mg/L | 1500 | 10 |
| NH4-N | mg/L | 92 | 1 |
| N(total) | mg/L | 173 | 10 |
Solution
Two-stage A/O MBBR biofilm process for treating the high ammonia wastewater, first aerobic stage, the nitrifying bacteria transforms the ammonia nitrogen to nitrate nitrogen. Then the liquid of the O1 tank be pumped back to the A1 process, denitrification using the carbon source from the inffluent. 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 biofilm process was successfully started up in mid-May 2014. Performance testing was a success, Biolfilm where attache in the BioCell media grew very well. And the system meets the effluent design criteria.
