Technique for using solids separated by preliminary solid-liquid separation for culturing fish and shellfish and reducing pollution load to subsequent biological treatment

Abstract

To provide a wastewater treatment apparatus that facilitates transportation and installation by downsizing a septic tank or the like.SOLUTION: An apparatus separates feces and kitchen waste from toilet wastewater, restaurant wastewater, and food factory wastewater to reduce the pollution load on downstream biological treatment tanks, or converts the separated solids into feed for fish and shellfish. This separation apparatus is a grid that is inclined approximately 30° with respect to the vertical falling direction of the wastewater (approximately 60° counterclockwise from horizontal), grid bars are cylindrical bars made of plastic or stainless steel and have a diameter of 1-3 cm. Both vertical and horizontal bars rotate, so that the captured solids quickly slide down the grid plate and fall into a solid collection box or a fish and shellfish breeding tank below. The liquid content that has passed through the grid is collected to a funnel-shaped water collection device and transferred to a downstream purification facility such as a biological treatment tank.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] Solid-liquid separation, water treatment, biological treatment, fish and shellfish farming

Background Art

[0002] Conventional technologies treat wastewater with solid-liquid mixed, resulting in a large biological treatment tank. In addition, the sludge obtained through biological treatment contains a lot of inorganic substances and can only be used as plant fertilizers or construction materials. Since it has a high water content, it cannot be directly used as fuel. By separating solid and liquid before complete mixing as in this patent, the biological treatment tank can be made smaller, and the separated solids are rich in organic matter, so they can be used for feeding animals such as fish and shellfish.

Prior Art Documents

Patent Documents

[0003] Patent 5597042 Patent 4215427 Patent 4586095 Japanese Patent Application Laid-Open No. 2012-008922

Summary of the Invention

Problems to be Solved by the Invention

[0004] (1) Make septic tanks, etc. smaller to facilitate transportation and installation. Especially in developing countries, if there is no specific merit (such as leading to cash income) for installers, they often do not install them. As a result, environmental pollution progresses, not only river pollution but also groundwater pollution advances, and the cost of tap water increases. (2) Especially in developing countries, increase the food self-sufficiency rate and reduce the food production cost to prevent hunger.

Means for Solving the Problems

[0005] The amount of pollution load discharged from households is 58 g / person / day in terms of BOD, of which excreta (mostly feces) is said to be 18 g / person / day (from the Comprehensive Sewage Guidelines for River Basins), and the ratio is about 30%.

[0006] (1) When it enters a septic tank or the treatment tank of a sewage system, it becomes difficult to separate solids from liquids. Therefore, by installing the solid-liquid separation device of the present invention before it falls from the drain pipe and enters these tanks, feces and other substances can be separated in advance, thereby solving the above problems. The solid matter can be used for the breeding of fish and shellfish, and if the bred fish are used for livestock breeding again, the aversion to feces and urine will be reduced. In addition, since the load is reduced by 30%, the capacity of the biological treatment tank of the septic tank can be reduced by 30%. (2) The pre-solid-liquid separation device is an inclined grid plate, but as it is, it is difficult for the separated solid matter such as feces to fall. In addition, the grid becomes clogged, reducing the separation efficiency. Therefore, the horizontal grid bars and the vertical grid bars are rotated to solve these problems. (3) Instead of using a power system that is weak against the rotating water of the grid bars, it is carried out by rotating the blades (fans) attached to the grid bars with wind power.

Brief Description of the Drawings

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Claims

1. An apparatus (hereinafter referred to as a pre-solid-liquid separation device) that separates feces and kitchen waste from toilet drainage, restaurant drainage, and food factory drainage to reduce the pollution load on the subsequent biological treatment tank or convert the separated solids into feed such as fish feed. This separation device is a grid with an inclination of about 30° (about 60° counterclockwise with respect to the horizontal) with respect to the vertical direction of the drainage fall. The grid bars are cylindrical bars made of plastic or stainless steel and have a diameter of 1 to 3 cm. By rotating both the vertical and horizontal bars, the captured solids quickly slide on the grid plate and fall into the lower solid collection box or the fish breeding tank. The liquid that has passed through the grid is collected by a funnel-shaped water collection device and transferred to a purification facility such as a subsequent biological treatment tank.

2. The grid bars have the horizontal bars on the surface side. The horizontal bars rotate uniformly from the surface towards the vertically downward direction, while the vertical bars are arranged such that the opposing bars rotate in opposite directions. Also, the rotational power is provided by wind power, and a fan is attached to one side of the grid bars. The horizontal bars concentrate the fans on one side and cover the entire fan to prevent wind power dispersion, allowing the wind power to act efficiently on the fans and rotate the grid bars. Since the opposing vertical bars rotate in opposite directions, the same rotation has a fan attached to the same side, and in the case of reverse rotation, a fan is attached to the opposite side. Similar to the horizontal bars, the entire fan is covered to prevent wind power dispersion.

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