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A study was conducted to validate test protocols commonly used to assess the stability of various biosolids products and to specify a standard for each test method. A comprehensive and coordinated effort involving a literature review, a selected survey of practicing facilities, and a sampling and analysis program were performed. Information concerning stability testing protocols and data for each of the biosolids stabilization technologies evaluated (aerobic digestion and anaerobic digestion, alkaline stabilization, and composting) and testing methods (specific oxygen uptake rate, volatile solids reduction and additional volatile solids reduction; pH and changes in pH, and carbon dioxide evolution) were collected and evaluated.

Specific protocols for each of the five testing methods are recommended. For each of the specific protocols, intrinsic precision data (that is related to the test) are presented. In addition, data are presented from facilities using each protocol to evaluate the collective degree of variability associated with each stabilization process. Using split - sample testing, interlaboratory data (variability among different laboratories) are presented. Issues associated with variability, sources of error, shortcomings and numerical criteria values are discussed for each method.
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Document Type: Research Article

Publication date: 2002-01-01

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