NOVELTY - Entrapping immobilization pellets in which microorganisms are entrapped and immobilized in an immobilizing agent, comprise an attachment prevention inorganic filler for preventing attachment of the entrapping immobilization pellets, where the attachment prevention filler is included in the immobilizing agent. The attachment prevention filler has an average particle size of 5-100 microns, and has a concentration of 3-20 mass % based on the entrapping immobilization pellets. The attachment prevention filler is located on a part of the surface of the entrapping immobilization pellets.    USE - As entrapping immobilization pellets useful in wastewater treatment equipment (claimed) for wastewater treatment.    ADVANTAGE - The pellets can be stored or transported inexpensively and easily without impairing their inherent pellet performance. Since the immobilizing agent is water-soluble and has a relatively low viscosity, the attachment prevention filler is easily uniformly dispersed in the immobilizing agent. Thus, the attachment prevention filler is uniformly dispersed on the surface of the pellets. Accordingly, pellets adhere to each other only with difficulty, and can be stored or transported easily and inexpensively without impairing their inherent pellet performance. Pellets can be stored or transported without introducing water into a bag or case, unlike a conventional storage or transportation method in which water is introduced into a bag or case. The pellets obtained by polymerization after addition of specific attachment prevention filler adhere to each other only with difficulty, and the pellets can be directly introduced alone into a bag or case for storage or transportation, even if water is not introduced into it. Accordingly, pellets can be stored or transported inexpensively and easily. A large amount of the attachment prevention filler is located on a part of the surface of the entrapping immobilization pellets. Therefore, the pellets adhere to each other only with difficulty even if only a small amount of the attachment prevention filler is added. Since the entrapping immobilization pellets of the present invention are introduced into a biological treatment tank, the biological treatment tank can be packed with microorganisms at a high concentration without impairing pellet performance, and wastewater can be efficiently treated. Since attachment prevention filler is located on a part of the pellet surface where the pellets are to adhere to each other, only a small amount of the attachment prevention filler added can prevent adhesion of the pellets to each other. Therefore, pellets can be stored or transported inexpensively and easily without impairing their inherent pellet performance.    DETAILED DESCRIPTION - Entrapping immobilization pellets in which microorganisms are entrapped and immobilized in an immobilizing agent, comprise an attachment prevention inorganic filler for preventing attachment of the entrapping immobilization pellets, where the attachment prevention filler is included in the immobilizing agent. The attachment prevention filler has an average particle size of 5-100 microns, and has a concentration of 3-20 mass % based on the entrapping immobilization pellets. The attachment prevention filler is located on a part of the surface of the entrapping immobilization pellets. The immobilizing agent comprises an acrylate derivative or diacrylate derivative of a polymer made of ethylene oxide and propylene oxide, and the acrylate derivative or diacrylate derivative has a molecular weight of 1000-10000.    INDEPENDENT CLAIMS are included for the following:    (1) producing the entrapping immobilization pellets involving spreading in advance an attachment prevention filler over the internal surface of a forming container or over a forming sheet; casting a liquid mixture of at least microorganisms and an immobilizing agent on the attachment prevention filler; polymerizing the liquid mixture to prepare a formed product; and cutting the formed product into pellets; and    (2) method for storing or transporting the entrapping immobilization pellets in a storage container, involving storing or transporting the entrapping immobilization pellets without introducing water into the storage container.