Author: Charles R. LeePublisher:
ISBN:
Category : Water reuse
Languages : en
Pages : 32
Book Description
Highlights of Research on Overland Flow for Advanced Treatment of Wastewater
Author: Charles R. LeePublisher:
ISBN:
Category : Water reuse
Languages : en
Pages : 32
Book Description
Highlights of Research on Overland Flow for Advanced Treatment of Wastewater
Author: Charles R. LeePublisher:
ISBN:
Category :
Languages : en
Pages : 26
Book Description
Overland flow treatment of municipal wastewater was studied in greenhouse grass-soil models. The response of overland flow treatment of nitrogen, phosphorus, and heavy metals to various operating conditions was determined. Nitrogen removal from applied wastewater was exceptionally efficient, with best removal being obtained whenever the applied wastewater was allowed sufficient time to interact with the components of the overland flow system. Sufficient time for adequate treatment of wastewater could be obtained by increasing the application period from 6 to 18 hr, by decreasing the amount of applied wastewater from 1 to 1/2 in./acre, by decreasing the slope of application surface from 8 to 2 percent, or by combinations thereof. Greater than 90 percent nitrogen and heavy metal removal could be obtained during overland flow treatment. Generally, 80 percent of the applied phosphorus was removed with overland flow treatment. Up to 98 percent phosphorus removal could be obtained by addition of stoichiometric amounts of aluminum sulfate to the wastewater prior to land treatment. Nitrogen, phosphorus, and heavy metals were found to accumulate on the soil surface in the organic mat with little movement into lower soil depths. Heavy metals accumulated on the soil surface nearest the point of wastewater application. Elevated levels of heavy metals were correspondingly found in the grass harvested nearest the point of wastewater application. The results of this modeling study indicate that overland flow is a feasible method for treating municipal wastewater to achieve a tertiary level of water quality. (Author).
Feasibility of Overland Flow for Treatment of Raw Domestic Wastewater
Author: R. E. ThomasOverland Flow Treatment of Raw Wastewater with Enhanced Phosphorus Removal
Author: R. E. ThomasPublisher:
ISBN:
Category : Land use
Languages : en
Pages : 48
Book Description
Overland Flow as Advanced Treatment for Wastewater
Author: Armen AsaturiansPublisher:
ISBN:
Category : Sewage
Languages : en
Pages : 128
Book Description
Selected Water Resources Abstracts
Author: Overland Flow Treatment of Wastewater
Author: Charles A. CarlsonPublisher:
ISBN:
Category :
Languages : en
Pages : 119
Book Description
Land application has been suggested as an effective, low-cost method for advanced treatment of wastewater from military reservation treatment plants. This study is being conducted to determine the mechanisms involved in wastewater treatment by overland flow so that operational feasibility, design, and performance criteria can be more accurately evaluated. A model 5 ft wide and 20 ft long was prepared with grass sod and a low-permeable Susquehanna clay to a 6-in. depth at a 2% slope. Secondary effluent from a model treatment plant was supplemented with 13.4 mg/l of nitrogen as ammonium nitrate and 0.2 mg/l of cadmium, copper, lead, manganese, nickel, and zinc to simulate average wastewater. The study was conducted for 12 weeks with effluent applied by flooding from the upper end of the slope at 0.5 in./day (6-hr periods) for 4 days per week. The wastewater was generally distributed into 20, 30, and 50% for subflow, evapotranspiration, and runoff, respectively. Analyses showed that 100, 95, 91, and 75% of the ammonium, nitrate, and organic nitrogen and phosphorus, respectively, were retained in the model. The loss of 25% of the applied phosphorus in runoff indicated a need for more surface contact, probably obtainable by increasing the model length. The subflow analyses showed excellent removal of nitrogen, phosphorus, and most heavy metals indicating effective removal mechanisms by the soil during the study period.
State of Knowledge in Land Treatment of Wastewater
Author: EPA 625/1
Author: Feasibility of Overland Flow for Treatment of Raw Domestic Wastewater
Author: National Environmental Research Center (Corvallis, Oregon).Publisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description