The formulation of the septic tank method and the popularization of septic tanks

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In May 1983, Japan enacted the "Purification Tank Law." The Purification Tank Law is a comprehensive piece of legislation that standardizes and regulates every aspect of purification tank production, installation, maintenance, and management. The law clearly defines the obligations and responsibilities of individuals and enterprises involved in the purification tank industry and establishes a qualification certification system for purification tank technicians. As a result, Japan introduced national qualifications for purification tanks—the Purification Tank Management Specialist and the Purification Tank Installation Specialist. The Purification Tank Law was officially put into effect in October 1985. In 1987, to further promote the adoption of integrated purification tanks, Japan's Ministry of Health and Welfare established the Purification Tank Measures Office (now the Purification Tank Promotion Office under the Ministry of the Environment). With strong government support, a subsidy program for small household purification tanks installed by individual households was launched that same year. In 1994, the central government also introduced a subsidy program aimed at local governments for the installation of small household purification tanks.
In 2000, the Septic Tank Law was revised once again, and standalone septic tanks were removed from the definition of the Septic Tank Law. Since then, when installing septic tanks in newly built homes, only combined-type septic tanks have been permitted, and the production of standalone septic tanks has been prohibited. In 2006, standalone septic tanks were also removed from the structural standards for septic tanks. Today, septic tanks play a significant role not only in the treatment of domestic wastewater but also in protecting aquatic environments and promoting water resource recycling.

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The mechanism of action of the core equipment in the emergency kit includes:

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The basic processing steps of rotational molding

The basic processing procedure of rotational molding is quite simple: powdered or liquid polymer is placed into a mold, which is then heated while simultaneously rotating around two perpendicular axes (both spinning on its own axis and orbiting around the other axis).

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The process principle of rotational molding.

The basic processing procedure of rotational molding is quite simple: powdered or liquid polymer is placed into a mold, which is then heated while simultaneously rotating around a vertical axis—both spinning on its own axis and orbiting. Finally, the mold is cooled to complete the shaping process.

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Plastic storage tanks are corrosion-resistant containers used in the industrial sector.

Plastic storage tanks are storage devices made from high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE) through an integrated molding process using rotational molding. They are classified as corrosion-resistant containers used in industrial applications, primarily for storing corrosive liquid media in industries such as chemical processing, environmental protection, and food processing.

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Product features of plastic storage tanks

Plastic storage tanks are integrally molded in one piece, offering excellent structural integrity, no weld seams, and zero leakage. They feature strong impact resistance, high tensile strength, and excellent resistance to oxidation and aging, making them compliant with hygienic food standards.

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Characteristics of septic tanks

A small domestic septic tank is a wastewater treatment device installed within the foundation of a residential home, capable of treating household sewage and discharging it on-site. From the perspective of water environmental protection and considering its cost-effectiveness, compared to municipal sewer systems, small domestic septic tanks have the following advantages:

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