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I,. <br /> Removing Total Organic Carbon from Wastewater <br /> rt, r ' Conclusion <br /> x - <br /> `'' In recent years, the potential threat posed b <br /> EDCs, PPCPs, and other contaminants of <br /> emerging concern has become an important <br /> �a regulatory driver at both the state and federal <br /> levels. Despite being predominantly organic <br /> compounds, contaminants of emerging <br /> r !s;- concern belong to a wide variety of <br /> 7 compound classes with significant variability in <br /> r chemical composition and properties, and can <br /> be active in extremely low concentrations. <br /> 3 Further, modern science is only beginning to <br /> �;:.. •< r _� z understand the implications of long-term, <br /> -', . s chronic exposure to low doses of these <br /> compounds in complex mixtures such as those <br /> found in drinking water supplies. <br /> These properties make CECs particularly <br /> Figure 5. Town of Chatham Zone 11 Area difficult to regulate. Still, state and federal <br /> and WWTF Site. authorities continue to identify appropriate <br /> Cost Comparison for the Town of Chatham to Address New Table 2 <br /> ENR' Treatment Alternatives to Address New TOC Requirements <br /> (alone) at WWTF <br /> ENR and TOC Treatment at the Replacement of the <br /> Treatment at the Water Supply Well Well <br /> WWTF2 <br /> Capital Costs $46M $69M $48M $50M <br /> O&M Costs $1.2M $3.2M $1.2M $1.2M <br /> PW Costs $62M $110M $65M $66M <br /> Orbal reactor configured as a Modified Ludzack Ettinger(MLE) process followed by denitrification filters. <br /> 2 Membrane Bioreactor followed by GAC adsorption. Costs for other types of TOC treatment were not estimated <br /> for the Chatham project. <br /> supply well.The DEP was hesitant to approve regulation for the introduction of CECs into <br /> this alternative, but they did allow the town to the environment. Regulations aimed at <br /> proceed with ENR treatment(alone) at the minimizing introduction of CFCs have <br /> WWTF with the stipulation that there would increasingly focused on regulation of TOC as a <br /> need to be additional discussions on treatment surrogate for individual CECs, It is reasonable <br /> levels if the town puts the water well back in to expect that more and more regulations <br /> production. aimed at minimizing TOC in both surface <br /> water and groundwater discharges will <br /> The town has since completed its CWMP and continue to emerge in coming years. <br /> is proceeding with the ENR upgrade and <br /> expansion tomeet-the-new-stringent-nitrogen In responding to existing and emerging <br /> limits. It is also expanding its collection system regulations, utilities should be aware that TOC <br /> to collect flows from properties with septic is effectively being used as a surrogate species. <br /> systems. As additional occurrence and toxicity <br /> information is developed for specific CECs, it <br /> The NEWER Journal Winter 2010 33 <br />