Root Zone-Based Water Purification Technology - March 2004

Root Zone-Based Water Purification Technology - March 2004

The root zone-based purification technology is particularly adopted in rural areas of France, and is recognized as a low-cost wastewater treatment method suitable for municipalities with small populations. This technique uses nitrogen-fixing microorganisms such as Azotobacter and Rhizobium found in the plant's root zone, functioning as a filter to remove organic matter, nitrogen, and phosphorus. Specifically, it has been introduced in environmental conservation areas like the Provence region in southern France and the Ruhr River basin, showing significant results in preventing eutrophication of water bodies.

This technology has a daily wastewater treatment capacity of approximately 1,000 cubic meters and reduces energy consumption by about 30% compared to conventional chemical treatments. Additionally, CO2 emissions are suppressed, making it highly regarded as a sustainable solution.

An example of its implementation is in a purification facility operated by Veolia Environnement, where this technology is applied to treat wastewater, reducing maintenance costs by around 20% compared to conventional methods. The same technology has also been adopted in Bavaria, Germany, contributing to forest region water source protection.

This technology is expected to expand its use in areas where excess nitrogen and phosphorus pose significant environmental problems, making it an important part of environmental preservation efforts.

Seed Bank Technology for Forest Conservation - May 2003

Seed Bank Technology for Forest Conservation - May 2003

Nagaoka Environmental Development Co., Ltd., based in Nagaoka City, Niigata Prefecture, utilizes "Seed Bank Technology" for the greening of forest slopes. This technology involves chipping felled trees such as cedar and pine, mixing them with seeds and fertilizers (nitrogen, phosphorus, potassium) collected from the local soil, and spraying the mixture for vegetation growth. It is particularly effective for slope restoration and is expected to reduce costs by more than 50% compared to conventional tree planting methods.

Through this technology, Nagaoka Environmental Development not only prevents the invasion of foreign species but also effectively regenerates native plants. Furthermore, this technology has improved the re-vegetation rate per hectare from 25% to 35%, allowing the company to promote forest regeneration projects covering 10 hectares annually.

This initiative aims to maintain local ecosystems while promoting the sustainable use of forest resources. The technology is gaining traction among other forest conservation businesses in the prefecture. Additionally, the company has received subsidies through the government's "Environmental Restoration Program," further supporting regional forest regeneration efforts.