(JP3507542-X)      A treating system has a horizontal zigzag flow type tank or a vertical zigzag flow type tank. The interior of a chamber is partitioned by partitions in the horizontal or vertical direction to provide compartments continuous in a horizontal zigzag fashion or vertical zigzag fashion. In each of the compartments, filter materials stand close together or lie down in parallel to one another. Alternatively, a treating system has a combined up and down flow type treating tank, where independent compartments which are connected to one another such that the matter to be treated is alternatively and repeatedly treated and discharged from a final compartment by an up-flow or a down-flow, and in each of the compartments, filter materials stand close together. In the both treating systems, the filter material consists of a core material and a multiplicity of thin tape members made of synthetic resin radially extending around this core material. In addition, an automatic gas-like agitator for agitating the matter to be treated in the tank with the use of methane gas produced in the tank may be connected to the system for improved treating efficiency.    (EP560981-B1)      A treating system has a horizontal zigzag flow type tank or a vertical zigzag flow type tank. The interior of a chamber is partitioned by partitions in the horizontal or vertical direction to provide compartments continuous in a horizontal zigzag fashion or vertical zigzag fashion. In each of the compartments, a plurality of filter materials stand close together or lie down in parallel to one another. Alternatively, a treating system has a combined up and down flow type treating tank, where independent compartments which are connected to one another such that the matter to be treated is alternately and repeatedly treated and discharged from a final compartment by an up-flow or a down-flow, and in each of the compartments, filter materials stand close together. In the both treating systems, the filter material consists of a core material and a multiplicity of thin tape members and a multiplicity of thin tape members made of synthetic resin radially extending around this core material. In addition, an automatic gas-life agitator for agitating the matter to be treated in the tank with the use of methane gas produced in the tank may be connected to the system for improved treating efficiency.    (JP2897791-B2)      A treating system has a horizontal zigzag flow type tank or a vertical zigzag flow type tank. The interior of a chamber is partitioned by partitions in the horizontal or vertical direction to provide compartments continuous in a horizontal zigzag fashion or vertical zigzag fashion. In each of the compartments, a plurality of filter materials stand close together or lie down in parallel to one another. Alternatively, a treating system has a combined up and down flow type treating tank, where independent compartments which are connected to one another such that the matter to be treated is alternately and repeatedly treated and discharged from a final compartment by an up-flow or a down-flow, and in each of the compartments, filter materials stand close together. In the both treating systems, the filter material consists of a core material and a multiplicity of thin tape members and a multiplicity of thin tape members made of synthetic resin radially extending around this core material. In addition, an automatic gas-life agitator for agitating the matter to be treated in the tank with the use of methane gas produced in the tank may be connected to the system for improved treating efficiency.