Abstract: With prior-art biofilm treatment methods involving the use of microorganism carriers, the microorganism carrier filter beds get blocked as the biofilms grow, highly concentrated organic wastewaters, oily/fatty wastewaters, etc. cannot be stably treated, the appreciable costs incurred in dehydrating, drying, and incinerating the reduced-volume sludge of the generated excess sludge, treating the incineration ash, etc., are further increased, compounding the financial considerations relating to various spheres of operation. A wastewater treatment carrier comprises a core portion and a microorganism holding portion, wherein the microorganism holding portion is formed with multi-threads characterizing in that the fibers of the multi-threads are formed in a relaxed state so that the fibers can be spaced apart from each other in the wastewater with forming in multiple stages and a loop. The invention can also be adapted to high-concentration organic wastewater and/or inflowing raw water having high load variability.

Abstract: In a microbubble liquid producing apparatus, an air bubble liquid producing device for mixing liquid with air by an aspirating pressure generated by a pressure pump arranged on a liquid feeding pipeline while aspirating the liquid from a liquid supply source and forcibly feeding the liquid by pressure is disposed on the liquid feeding pipeline on the upstream side of the pressure pump relative to the liquid feeding direction. A first air-bubble atomizer is disposed on the liquid feeding pipeline on the downstream side of the air bubble liquid producing device for atomizing the air bubbles contained in the air-mixed liquid produced by the air bubble liquid producing device. A second air-bubble atomizer is disposed on the liquid feeding pipeline on the downstream side of the first air-bubble atomizer for further atomizing the air bubbles atomized by the first air-bubble atomizer.

Abstract: There are provided a microbubble liquid producing apparatus capable of effectively producing microbubble liquid containing fully microscopic air bubbles, and a device for atomizing air bubbles using the microbubble liquid producing apparatus. An air bubble liquid producing means A for mixing liquid with air by an aspirating pressure generated by a pressure pump D arranged on a liquid feeding pipeline P while aspirating the liquid from a liquid supply source and forcibly feeding the liquid by pressure is disposed on the liquid feeding pipeline P on the upstream side of the air bubble liquid producing means relative to the liquid feeding direction. A first air-bubble atomizer B is disposed on the liquid feeding pipeline P on the downstream side of the air bubble liquid producing means relative to the liquid feeding direction for atomizing the air bubbles contained in the air-mixed liquid produced by the air bubble liquid producing means A.