Different Uniform Media Direct Filtration Performance Pilot Study

Deep bed filtration is a very important treatment unit for water and wastewater treatment. Thekind and quality of filter media are keys to filtration process. Stricter rules of water qualitypromote higher treatment goal. Therefore, study on the characteristic of filter media is necessaryto optimization filtration process.The main purpose of this thesis is to study direct filtration performance with uniform media, thekinds of media include coarser and finer quartz sand, earthenware media, anthracite media. Basedon the streaming potential theory, a simple apparatus is provide to measure the zeta potential ofgranular media. Other physics-chemical parameters of media are discussed also.Contrast experiment of two pilot filter to removal kaolin by Al₂(SO₄)₃ is studied in the conditionof equivalent bed surface. Based on analysis and calculation, research results include:1. The order of specific deposit in filter bed is about 10^-2l0^-3, distribution of specificdeposit could be used to access the property of filter.2. Specific surface model for spherical media is suitable in this research.3. Specific surface per area media is a suitable index to evaluate property of filter.4. Filter performance of coarser media is superior to finer media in view of head loss.5. Filter performance of anthracite media is superior to finer quartz sand.6. Head loss of earthenware media is less than coarser sand, contrast relation betweentheir effluent turbidity is varies with operational condition.In addition, a more rational conservation equation is deduced for deep bed filtration.