PROBLEMS IN DAIRY WASTEWATER TREATMENT
Operational data from nine dairy wastewater plants in Wisconsin were collected and analyzed to determine reasons for frequent deterioration of biological phosphorus removal (BPR) efficiency and to optimize BPR for various wastewater treatment processes. Several major factors affecting BPR were identified from the data obtained from dairy wastewater treatment plants. First, many dairy wastewater treatment plants suffer low F/M ratios during off-days, leading to sludge bulking and unstable and poor BPR efficiency. Most dairies do not have an equalization tank or the size is inadequate to alleviate the fluctuation in flow and organic loading. Second, many dairy wastewaters are nutrient deficient. Currently, there are few plants adding ammonia or urea steadily and automatically. Third, many dairies have a severe pH swing within a matter of hours. Fourth, seasonal temperature variations are also found to have a significant effect on the microbial population, leading to the decrease in BPR efficiency. Fifth, frequent chemicals spills, notably brine solution, led to poor BPR as well as decreased COD removal efficiency. Last, the fluctuation in flow, organic loading, and pH magnified the impact to small anaerobic/anoxic tanks compared with large conventional continuously-stirred tank reactors. Laboratory-scale tests confirmed the effects of the COD/P ratio and pH on BPR efficiency. As the influent COD/P ratio increased, the phosphorous release during the anaerobic stage increased, resulting in improved BPR efficiency. When influent pH was greater than 8.5 under the condition tested, microorganisms lost their stability in a bench-scale batch test. Several suggestions for achieving stable and efficient BPR are provided.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: 01 January 2001
More about this publication?
- Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites