|DEFINITION OF A HAZARDOUS WASTE
Under RCRA, (Resource Conservation and Recovery Act)
Definition and discussion of regulations limits – prevention of deviating wastes being introduced into effluent waste recycling systems RCRA - establish the criteria for identifying hazardous waste and managing it from its point of generation to ultimate disposal.
Representative of actual site conditions and effluent input
The location and frequency of sampling
Unbiased/random, Stratified Random, Biased/authoritative Composite, Grab, Auto sampling,Systematic, Ranked, Sequential Sampling
COMPLIANT CHEMICAL ANALYSIS
Trace, minor and major elements and element species ICP-AES and ICP-MS, conventional parameters, on-line for continuous monitoring of the sample media.
Leaching Test Objectives - Classification of wastes as hazardous or non-hazardous for regulatory application, Evaluation of leaching potential of pollutants resulting from a waste under specified environmental conditions - site-specific leaching conditions,
Types of Leaching Tests
Batch leaching tests
Extraction Procedure Toxicity (EP-Tox; US EPA Method 1310, 2001)
Toxicity Characteristic Leaching Procedure (TCLP; US EPA Method 1311, 2001).
Waste Extraction Test (WET; California Code of Regulations, 1985),California Waste Extraction Test (WET)
Whole effluent toxicity (WETOX) test methods for use in the NPDES (National Pollutant Discharge Elimination System) monitoring American Society for Testing and Materials extraction test (ASTM D3987-85, 2001
Multiple Extraction Procedure (MEP; US EPA Method 1320).
Deionized water leaching procedure (DWLP) test.
Regulatory Batch Tests in European Countries
Shortcomings of batch leaching procedures
Classification of wastes according to leachable concentrations TTLC value, STLC value
Factors Affecting Leaching
Physical, Chemical-Biological Factors, Particle size, Contact time, homogeneity. Liquid-to-Solid (L/S) Ratio, Temperature, pH, Redox, e.g. biologically induced, acid drainage, Complexation - - speciation. Precipitation, organic carbon content,
LEACHING TESTS FOR RISK-BASED DECISION MAKING OF SOLID WASTE MANAGEMENT - Risk assessment