The modern trickling filter is quite advanced from the rock filters of old. These new filters are engineered systems that provide a very cost-effective process for treatment of both domestic and industrial wastewater. Trickling filters are routinely designed to treat wastewater to NPDES standards including ammonia removal and/or they can be designed to provide low-cost roughing of high-strength wastewater. Trickling filters are often teamed up with activated sludge systems to reduce the overall cost of wastewater treatment
PVC Trickling Filter Media
The introduction of thermoformed PVC sheetmedia is largely responsible for the success of the modern trickling filter. This advancement allows construction of modules of superior compressive strength and higher void-volumes necessary for stacking to heights not achievable with rock filters. In addition, greater specific surface area makes higher organic loadings possible and makes more efficient nitrification towers possible. Deeper bio-towers are easily ventilated because of the higher void volumes.