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Wastewater demineralization by ion exchange
1971
Kreusch, Ed | Schmidt, Kenneth D. (Kenneth Dale)
Sludge material recovery system for manufacturers of pigmented papers
1971
The river basin model: chairman and council
1971
Phosphorus removal by ferrous iron and lime
1971
Alvord, E. Thomas
Spent pickle liquor, as a source of ferric ion, was added to primary treatment facilities and found to be effective in removing more than 60% of the phosphorus contained in the sewage. When advanced means for more complete removal of the insolubilized phosphates are available, removals in excess of 90% are indicated. In addition, overall suspended solids removals averaged 61.5% and BOD and COD removals averaged 61.6 and 55.3 percent during a 23 month test period. Required iron dosage ranged from the theoretical minimum of 2.7 to a maximum of approximately 3.1 weights of ferrous iron per weight of phosphorus. The weight increase in sludge solids due to chemical precipitation of phosphorus was 100 lbs/million gallons/mg/liter of phosphorus in the influent. Total costs for treating a raw sewage containing 13 mg/l phosphorus are given.
Показать больше [+] Меньше [-]Responses of teleost fish to environmental stress
1971
Smith, Lynwood S.
Stochastic modeling for water quality management
1971
Krutchkoff, Richard G.
Estuarine modeling: an assessment
1971
Ward, George H. | Espey, William H.
An investigation of techniques for removal of cyanide from electroplating wastes
1971
Neutradesulfating treatment process for acid mine drainage
1971
Role of animal wastes in agricultural land runoff
1971
Robbins, Jackie W. D. | Howells, David H. | Kriz, George J.
Twelve typical agricultural areas representing three types of animal waste management techniques--lagooning, direct discharge into streams, and land spreading including pasture and drylot units--were studied to determine the amounts of and factors governing stream pollution from swine, dairy, beef, and poultry production operations. More than 1500 stream and lagoon effluent samples were collected with an automatic sampler developed for the study. The samples were analyzed for bacteria, nutrients, and degradable organics. Hydrological and waste management data were also collected. Study results point to the superiority of land spreading for the disposal of animal wastes.
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