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FULL-SCALE EVALUATION OF THE EFFECT OF DISINTEGRATION OF BIOMASS ON SECONDARY TREATMENT

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Abstract:

The KADY Bio-Lysis System is one of several systems developed to disintegrate biomass in activated-sludge systems, with the goal of decreasing production of waste activated sludge. Several studies on various types of equipment used to disintegrate return activated sludge have shown decreased production of waste activated sludge. Modeling with the International Water Association's Activated Sludge Model Number 1 also predicts decreased sludge production.

Full-scale testing of the KADY Bio-Lysis System was conducted by KADY International at the Springfield (Massachusetts) Regional Wastewater Treatment Plant. Test equipment was installed on two of the plant's four parallel trains, with the other two serving as control trains. Flow measurements showed that flows were reasonably evenly split between the test and control sides, and analysis suggested that loads were adequately split between the sides. Observed yield for the test side averaged 12% less than for the control side. However, for the same SRT, yield for the test side was higher than for the control side. This increase contradicts findings in other studies. Also, sludge settleability decreased on the test side, although disintegration of return activated sludge improved settling in previous studies. Less air was required on the test side than on the control side, as shown in previous studies.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864703784755058

Publication date: 2003-01-01

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