bed filter meaning in English

滤床式过滤器

Fixed bed filters for water treatment - structure and components
水处理用固定式水底过滤器.结构和部件
Wastewater treatment plants - principles for the design of structures and technical equipment - part 8 : specific principles for the equipment for sewage treatment in granular media filter and granular fixed bed filter
污水处理厂.结构和技术设备设计原则.第8部分:粒状介