Specifications include, but are not limited to: The requested Polymer (Cationic or Anionic) will facilitate the Belt Pressing effort for the Wastewater Biosolids that are generated several times per week. The belt filter pressing process is used to remove water from liquid wastewater residuals and produce a non-liquid material referred to as “cake.” Dewatering wastewater solids reduces the volume of residuals, improves operation, and reduces costs for subsequent storage, processing, transfer, end use, or disposal among other benefits. The Biosolids will be pressed/dewatered into a sludge cake that is intended to have a percent solids content of twelve (12) to eighteen (18) percent or potentially higher at times. 9.1. Polymer Type: Since both anionic and cationic emulsion polymers can be used for dewatering wastewater biosolids, the City is open to look at both charges. These polymers should be high-molecular-weight substances that work by bridging and binding the particles in the sludge together allowing water to be released and separated from the solid matter thus forming a sludge cake as the end product. 9.1.1. Desired Charges: Very high molecular weight cationic or anionic. We are looking for the one that has the best dewatering results. 9.2. Jar-Testing: Bidders will be expected to perform bench scale jar testing to show the effectiveness or the ability of their product to meet certain performance criteria. Performance criteria must be met before any product can be considered for purchase. The City desires to see, at a minimum, a sludge cake solids content of fourteen percent (14%). A sludge cake percentage content of fourteen (14) to eighteen (18) percent or higher would be very good. For the top end, the higher the better...
