ENHANCED DENTAL AMALGAM TRAP

描述：城市污水处理厂在全国各地进行的调查 该国得出的结论是，10%到70%以上的 到达植物体内的汞来自牙科诊所。这些发现， 再加上对汞排放的日益严格的监管， 向牙科专业人员施加压力，要求他们减少排出的牙齿 含汞汞齐。在欧洲，类似的担忧导致了 牙科银汞合金捕获设备的开发和营销。 这一多阶段SBIR项目的总体目标是加强 沉降型牙用银汞合金分离器的性能研究 分离器内的水化学作用。牙科废水中含有汞 三种一般形式：大颗粒汞齐、细汞齐颗粒和 溶解的汞金属或离子。简单的沉积圈闭可以在以下方面有效 捕捉大颗粒和许多细颗粒。这种情况经常发生 占总汞负荷的95%以上。然而， 溶解分数仍可能超过所需的排放极限。目前， 需要昂贵且需要大量维护的吸附剂才能实现排放 浓度在低ppb范围内。在第一阶段，计划是演示 将水化学控制在简单范围内的可行性 沉淀器，以最大限度地减少溶解汞的量。阶段1 如果成功，将在第二阶段进行优化和实地演示。 建议的商业应用：不可用

DESCRIPTION: Surveys conducted by municipal wastewater treatment plants across the country have concluded that anywhere from 10 percent to over 70 percent of the mercury reaching the plants comes from Dental offices. These findings, combined with increasingly stringent regulations on mercury discharges, have placed pressure on the Dental profession to reduce their discharges of mercury-bearing amalgam. In Europe, similar concerns have led to the development and marketing of devices to capture Dental amalgam. The overall objective of this multiphase SBIR project is to enhance the performance of sedimentation-type Dental amalgam separators by controlling the water chemistry within the separator. Dental wastewater contains mercury in three general forms: large particles of amalgam, fine particles of amalgam, and dissolved mercury metal or ions. Simple sedimentation traps can be effective at capturing the large particles and many of the fine particles. This often accounts for over 95 percent of the total mercury burden. However, the dissolved fraction can still exceed desirable discharge limits. At present, expensive and maintenance-intensive adsorbents are needed to achieve discharge concentrations in the low-ppb range. During Phase 1, the plan is to demonstrate the feasibility of controlling the water chemistry within a simple sedimentation device to minimize the amount of dissolved mercury. Phase 1 success would lead to optimization and field demonstrations in Phase 2. PROPOSED COMMERCIAL APPLICATION: NOT AVAILABLE