Addition of lime to improve sludge settling helps defer capital spending
Annual Conference
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New Zealand drinking water tends to lack alkalinity. Bad sludge settleability is a common problem in New Zealand waste water treatment plants. Both have one in common: dependency on cations.
The application of basic water chemistry and the addition of lime can drastically improve sedimentation characteristic of biomass. The article explains how well founded theory proves to be successful in practice in a trial plant.
Sludge structure, zone settling velocity and dewaterability improved dramatically.
First results showed that addition of lime can 10 fold the sedimentation velocity of sludge.