How does THIOGUARD® Reduce Biosolids Odors, Volume and Weight?

Sludge Holding Tanks:

a) Odor Control
b) pH - Chemical and Biological
c) Adsorption
d) pH
e) Divalent Cations


a) pH
b) Divalent Cation bridging - Provides increased divalent charge density that improves floc formation
c) Increased CST
d) Increased charge Density

Heat Drying:

Higher solids content produces Biosolids that will have less water content. 16% solids vs. 22% solids yields 6% less water. Heat drying is designed on pounds or tons of water evaporated. The product entering a kiln needs to be approximately 60% solids for proper pelletization. To accomplish this, 95% dry material is mixed with the sludge cake in a pug mill prior to entry into the kiln. The kiln then dries the material to ~ 95% solids therefore higher cake solids less water to evaporate from the mixture. Each plant has it's own operating parameters but they will all measure therms of gas used to dry the product and come out with a gas and electric cost per ton of dry product. Labor is a fixed cost.

What should be measured to show cost reduction:
1) Therms of gas per ton of dry product.
2) Electricity per ton of dry product.
3) Less dry sludge recycle.
4) May also be able to show a reduction in runtime on the drying train.
This can translate to increased capacity without expansion.


There may also be savings in composting for those plants using THIOGUARD®:
1) May show a decrease in bulking material (wood chips, etc)
2) Higher cake solids may reduce the land requirement for those using static pile or windrow composting and vessel size for those using in-vessel processes.
3) Less cake to compost also reduces labor requirements for this labor intensive process.




















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