面对不断上涨的污泥运输和处置成本，佐治亚州格温内特县保留了清洁发展机制 评估残留物处理方案，并最终试验、设计和监督一个 新的残余物处理设施，用于对过滤器反冲洗水残余物进行脱水 每天1.5亿加仑（mgd）地表水处理厂、拉尼尔过滤厂及其 未来150 mgd浅滩溪过滤厂。试点测试包括两个阶段，一个台架规模 筛选各种脱水技术，然后进行中试确认和 优选脱水工艺。评估脱水技术包括 带式压滤机、板框式压滤机和离心机。 一旦收集到试点数据，它就被用来制定全尺寸试验的设计标准 设施设计特点包括斜板沉降器和使用聚合物的桩篱笆浓缩机 混凝剂，一种污泥转移和化学调节系统，采用液体石灰和铁 氯化物化学处理，以及两台板框式压滤机，用于排出 将脱水后的固体放入下方的滚落容器中。压滤机是混合包装 配置有固定容积的凹腔板，与隔膜式交替 可以加压以进一步压缩污泥的板。这座新设施是在一个特殊的环境中设计的 符合美国环境保护署（EPA）反冲洗回收规则的方式， 这要求将任何循环流输送至处理厂的前端。另一个 要求是，新设施还减少了现有过滤器上的固体负荷 反洗沉淀池和污泥收集系统，由于 增加工厂生产需求。 新设施的建设从2000年底持续到2002年年中。 该设施现已上线， 使该县开始实现污泥运输和处置成本的大幅节约。包括表格、数字。

Faced with rising sludge hauling and disposal costs, Gwinnett County, Georgia, retained CDM to evaluate options for residuals disposal and ultimately pilot, design, and oversee construction of a new residuals handling facility to dewater the filter backwash water residuals generated at their 150-million-gallons-a-day (mgd) surface water treatment plant, the Lanier filter plant, and their future 150-mgd Shoal Creek filter plant. Pilot testing comprised two stages, a bench-scale screening of various dewatering technologies followed by pilot-scale confirmation and optimization of the chosen dewatering technology. Evaluated dewatering technologies included belt filter presses, plate-and-frame filter presses, and centrifuges. Once the pilot data was gathered, it was used to develop the design criteria for the full-scale facility. Design features include inclined plate settlers and picket fence thickeners using polymer coagulant, a sludge transfer and chemical conditioning system featuring liquid lime and ferric chloride chemical conditioning, and two plate-and-frame filter presses that discharge the dewatered solids into roll-off containers located below. The filter presses are a mixed pack configuration that have fixed-volume recessed chamber plates alternating with diaphragm style plates that can be pressurized to compress the sludge further. The new facility was designed in a manner that met the U.S. Environmental Protection Agency's (EPA) backwash recycle rule, which requires that any recycle stream be routed to the head of the treatment plant. Another requirement was that the new facility also reduced the solids loading on the existing filter backwash sedimentation basin and sludge collection system, which were overtaxed due to the increasing plant production needs. Construction of the new facility ran from late 2000 to mid 2002. The facility is now on-line, allowing the county to begin to realize substantial savings in sludge hauling and disposal costs. Includes tables, figures.