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Composting

Composting is a process that involves mixing the sludge with a bulking agent (sources of carbon such as sawdust, leaves, paper, straw or wood chips) to make sure that the mixture can be aerated for an accelerated aerobic degradation process. In the presence of oxygen, bacteria digest both the wastewater solids and the added carbon source and, in doing so, produce a large amount of heat.

As a first step the sludge is dewatered to allow the sludge to be self-supporting in a pile or stack and so facilitate composting. It is then mixed with the bulking agent to dry out the blended mix.

The problems are that much energy is required to aerate the composting material, and the end product, the compost, must be disposed of to suitable land and is not always attractive to farmers due to a lower fertilizer value.



Neutralac® solution

The following Neutralac® reagents will reduce bad odors and increase the agronomic value of the sludge, especially concerning Ca and/or Mg elements :



Liquid product - Neutralac® SL

Half burnt dolomi - Neutralac® CM


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