Large fluctuations in influent flow
Solution：By applying MicroMotion®-N and MicroMotion®-Den,the biological treatment system was rapidly restored after heavy metal shock, ensuring compliant effluent discharge.
Processing Scale：100000m³/d
Treatment Effect：System stabilized within 1 week, with effluent meeting discharge standards.
Characteristics
Large fluctuations in influent flow
Plant Profile
Description
Due to excessive concentrations of heavy metals such as nickel and cobalt in the wastewater, the on-site biological treatment system completely collapsed and lost all degradation capability.
Option
The biological treatment system was restored following on-site bench-scale testing. The key steps included:
1. Tank cleaning and sludge removal
2. Gradual influent reintroduction
3. Seeding with activated sludge
4. Dosing with MicroMotion®-N and MicroMotion®-Den.
Note: During nitrification startup, alkalinity is rapidly consumed, while the denitrification process has not yet resumed. Therefore, sodium carbonate (soda ash) was added to supplement the deficient alkalinity.
Result
After dosing with MicroMotion®-N, the effluent ammonia nitrogen dropped to ≤1 mg/L within 3 days.
Following the addition of MicroMotion®-Den, the total nitrogen removal rate reached up to 90% within 3 days.
Periodic Service
