http://www.environmental-expert.com/resultEachArticle.aspx?cid=5306&codi=22608&idproducttype=6&level=0
Napier City (New Zealand in planning to upgrade its wastewater plant to advanced primary treatment (APT) which will cut down on the amount of waste that is discharged into the ocean. To be honest, I think it sounds strange that any waste is being pumped into the ocean at all, but of course less is better.
The process included biosolids compost made of undigested sludge and also primary sludge produced by the addition of alum is paired with wood chips from a large timber processing serves as a carbon source and a bulking agent.
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