Fate and Effect of Carbon Tetrochloride and O-Xylene on Anaerobic Systems with Sulfate Reducing Bacteria
The fate and effects of o-xylene and carbon tetrachloride on methanogens and sulfate reducing bacteria were investigated using serum bottles. Up to 750 mg/1 of o-xylene did not cause any...
Anaerobic Biological Reduction of Selenate
When soils with high concentrations of naturally-occuring selenium are irrigated and drained, selenium is leached from the soil and appears in the drainage water. Selenium has caused death...
Evaluation and Selection of RBC Models for Design of Domestic Wastewater Facilities
This study evaluated three existing models commonly used for the design of Rotating Biological Contactors (RBC). Operating data from six RBC Treatment Plants located in eastern Massachusetts...
Aerobic Thermophilic Digestion or Liquid Composting of Municipal Sludges
A study funded by Supply and Services Canada through the Wastewater Technology Center of Environment Canada, and the Province of British Columbia is being undertaken over a two year period...
NAPL and Contaminant Transport in the Soil Matrix
A one-dimensional multiphase mass transport model for the migration of a Non-Aqueous Phase Liquid (NAPL) containing sparingly water soluble organics in the unsaturated soil zone is described....
Effect of Concentration on the Biological Degradation of Petroleum Hydrocarbons Associated with In Situ Soil-Water Treatment
Sandy soil samples contaminated with weathered JP-5 jet fuel were mixed with uncontaminated sand to provide a concentration gradient from 187 to 1565 mg total petroleum hydrocarbons (TPH)/Kg...
Biological Treatment of PAHs in Soil Residues in Simulated Land Treatment Systems
The lower molecular weight compounds (2 and 3 ring PAHs) are readily degraded by microorganisms. The heavier molecular weight PAH (polycyclic aromatic hydrocarbon) compounds (4, 5 and...
Aerobic Biodegradation of Chlorinated Solvents in Unsaturated Soils
A potentially attractive application of methylotrophic bacteria is in the treatment of contaminated, unsaturated soil. Methane and air could be supplied by injection and withdraw wells,...
Trio of Microcomputer Models for Organic Chemical Transport in Rivers
Three microcomputer models have been jointly developed to provide tools to simulate the fate of organic chemicals in river systems. The three models offer a range of complexities and data...
Environmental Analysis of Sludge Disposal Options
In a Court-ordered agreement to eliminate disposal of sludge from its treatment plants into the ocean, the City of Los Angeles was required to evaluate alternatives for transporting and...
Digester Gas Resource Recovery at Phoenix, Arizona
Until July 1986, the digester gas produced at this 150 million gallon per day facility, in excess of what was utilized for heating anaerobic digesters was flared. In 1983, a feasibility...
Conversion of Mixed Waste to LSA Waste?A Case Study
This paper describes a treatment process that was successfully employed at the National Guard Armory in Chicago, Illinois, to convert sludge classified as hazardous chemical/radioactive...
Long-term Land Treatment: A Performance Evaluation
Overland flow (OLF) land treatment has been applied effectively in the United States for the treatment of industrial and municipal wastewaters. Although several overland flow systems in...
The Utilization of a Deflocculant to Decrease the Permeability of a Clay Liner
A hazardous waste landfill was completed in Oklahoma during 1988. The clay liner was constructed to fulfill the RCRA requirements for permeability of equal to or less than 1E-07 centimeters...
Treatment and Disposal Options
Viable treatment and disposal alternatives which can meet stringent environmental regulations and at affordable cost to the agricultural economy present formidable problems. Treatment...
Chemigation Equipment for Protecting Water Quality
Concerns for protecting groundwater quality have brought forth some strict EPA regulations on equipment required for injecting pesticides into irrigation systems. These chemigation equipment...
Stochastic Evaluation of Reservoir Operation Rules
The major water facilities in California encompass the State Water Project, operated by the State of California, and the Central Valley Project, owned and operated by the United States...
The Alabama Rainfall-Runoff Model, ARRM
ARRM consists of a conceptual state-space model which is cast in a stochastic framework. It uses the W.H. Green and C.A. Ampt method for infiltration, exponential decay for interflow and...
Alternative Methods of Generating Hydrologic Data for Reservoir Optimization
Given an historically based set of natural flows for the Colorado River at Lees Ferry, a series of 16 indexed sequential traces 78 years in length were derived using a 'wrap around' approach...
Hydropower Stochastic Forecasting and Optimization
A microcomputer package was implemented to support real-time decisions for weekly and month-end water management at an industrial complex in the mountains of British Columbia. The rolling...
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