Solution：Provided customized environmental steward services under the “one plant, one strategy” model, renovated biochemical units to ensure stable and compliant operations during winter conditions.
Processing Scale：13000m3/d
Treatment Effect：Achieved 100% compliance for COD, ammonia nitrogen, total phosphorus, and total nitrogen indicators, maintaining stable discharge standards throughout the service period.
Characteristics
(1) Large fluctuations in daily influent flow
(2) Low water temperature during winter and spring seasons
(3) Adequate dissolved oxygen
(4) Sludge floating and washout in the secondary sedimentation tank
(5) Reduced nitrification and denitrification capacity during low-temperature seasons
(6) Irregular shock loads from high-concentration slaughterhouse wastewater
Description
Based on long-term operational feedback and evaluations conducted by the technical engineers of the Environmental Steward Service, the following issues were identified:
1. Reduced nitrification and denitrification rates during the winter and early spring seasons.
2. Insufficient dissolved oxygen in the aerobic section of the biological treatment system, leading to frequent fluctuations in ammonia nitrogen levels.
3. Sludge washout in the secondary sedimentation tank due to the combined effects of high influent flow and low temperatures around the Chinese New Year period.
4. Suboptimal chemical usage and management practices were observed on-site.
5. Original process design failed to meet updated discharge standards since COD, NH₃-N, and TP must meet Surface Water Class V standards, while TN must comply with Class 1A standards.
6. Operators’ competencies were inadequate to ensure the stable operation of the wastewater treatment plant.
Result
Through the Environmental Steward Service and the implementation of tailored, multi-faceted measures based on the plant’s specific conditions, staff competencies were significantly improved. Real-time discharge feedback was shared with local environmental authorities, and high-concentration slaughterhouse wastewater discharges were transitioned from unplanned to scheduled, mitigating the impacts caused by shock loads.
As a result, for four consecutive years, the plant achieved 100% compliance with discharge standards for CODcr, ammonia nitrogen, total phosphorus, and total nitrogen. This has made a substantial contribution to maintaining Class II water quality at downstream national monitoring sections throughout the year. Additionally, under the guidance of our technical team, comprehensive documentation and operational protocols were established to ensure scientific, economical, and practical management practices.
Periodic Service
