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Runoff from spray application of secondary wastewater effluent on a forested hillside in West Dover, Vermont, was monitored for a six-week summer period (11 July-19 August 1977). Both quantity and quality of applied effluent and site drainage were monitored. On-site groundwater and two adjacent streams were sampled for water quality. Drainage flows were relatively constant during the study period in spite of highly variable inputs to the site. There is evidence that substantial quantities of water may be leaving the spray site by moving through the subsurface fragipan layer. On a mass basis, 95% of the total nitrogen, 96% of the ammonia nitrogen, 92% of the nitrate-nitrogen, 98% of the organic nitrogen, 99% of the total phosphorus, and 79% of the BOD5 were removed by spray application. Heavy precipitation was observed to flush most nutrient forms, especially nitrate-nitrogen, from the spray site. Groundwater on the spray field contained lower concentrations of nutrients than did the applied effluent, but higher concentrations than those found in site drainage. No hazardous nitrate levels were detected in groundwater. No elevations of nutrient concentrations in the Deerfield River or Ellis Brook were detected during the study period. However, there was some evidence of increased chloride concentrations in Ellis Brook. (Author).
A general description of a wastewater land treatment system located in a 'cold temperate' climatic region is given. The winter season average daily design flow is almost double that of the summer-fall season (0.55 MGD vs 0.30 MGD). Wastewater is sprayed on a forested knoll after it receives secondary biological treatment. The system is operated during the winter when the ambient air temperature is as low as 10 F ( -12.2 C). Spray nozzles have been developed that ensure rapid drainage of the spray laterals after each spray cycle and, therefore, prevent their freezing. (Author).
During the winters of 1975-76, 1976-77 and 1977-78 biologically treated wastewater was applied to land in West Dover, Vermont. The wastewater was applied using the spray irrigation method at ambient temperatures as low as 0 deg F. During the first winter, freezing was a major problem. Modified spray nozzles that were less susceptible to freezing were installed at both the low points and high points of the aboveground spray laterals. During the second and third winters, ice buildup along the spray laterals, particularly in the vicinity of the spray nozzles, caused serious damage to the pipes. Many man-hours were required to continuously cut the ice from the laterals. As an experiment to alleviate the problem several 30- to 36-in. risers were installed at an angle of approximately 30 deg. from the vertical on two of the spray laterals during the winter of 1977-78. They functioned well enough to warrant future installation on the entire system of spray laterals. (Author).
Introductory technical guidance for civil engineers, environmental engineers and other professional engineers and construction managers interested in wastewater treatment. Here is what is discussed: 1. INTRODUCTION, 2. PROCESS PERFORMANCE, 3. CROP SELECTION, 4. PREAPPLICATION TREATMENT, 5. LOADING RATES AND LAND AREA REQUIREMENTS, 6. STORAGE REQUIREMENTS, 7. DISTRIBUTION SYSTEM, 8. DRAINAGE AND RUNOFF CONTROL, 9. SYSTEM MANAGEMENT, 10. SYSTEM MONITORING, 11. FACILITIES DESIGN GUIDANCE, 12. REFERENCES.
The study of water resources crosses disciplinary boundaries, from geography and natural resources, to Earth sciences, environmental studies, and engineering. Since not all students come to the water-resources course with the same mathematical background, Clausen’s effective, practical presentation integrates topics related to water quantity and water quality. He emphasizes fundamental concepts throughout: the qualitative foundations of hydrology needed to understand the hydrologic cycle and water availability, as well as the physical, chemical, and biological principles underlying water quality. Important social-science issues, including water law and regulations, the economic principles of water supply and demand, and sustainable water management, contextualize the material. Abundant illustrations and purposeful examples reinforce chapter content. End-of-chapter problems provide opportunities for readers to practice the calculations needed for real-world applications.