As an underground reservoir for rainwater storage, PP modular units feature a modular design made of high-strength polypropylene. They can be flexibly combined into storage tanks of various capacities, combining advantages such as high compressive strength, corrosion resistance, and easy installation—all without occupying above-ground space. These units are suitable for diverse settings, including residential areas, parks, and commercial complexes.
They efficiently store treated rainwater for non-potable uses such as landscape irrigation, road cleaning, and miscellaneous domestic purposes. This not only reduces reliance on municipal water supplies but also enhances urban flood control and drainage capacity, truly turning "stormwater into a resource" for Sponge Cities.
As cities grapple with the challenge of combined sewer systems, the initial stormwater—carrying pollutants like sediment and oil—has become a major obstacle in waterway management. From residential rainwater-sewage diversion upgrades to river outfall remediation, this durable, low-operational-cost intercepting trash basket catch basin is becoming an integral component of Sponge City development, effectively clearing the path for subsequent rainwater resource utilization.
The "contaminated initial stormwater" during early rainfall phases poses the greatest challenge to water resource recovery—its pollutant concentration can be 3–5 times higher than in mid-to-late stages. Direct collection would cause equipment clogging and failure to meet water quality standards.
The diversion chamber increases the pollutant removal rate of subsequently collected rainwater by 40%–60%, not only reducing the load on sewage pipelines but also building a solid safety barrier for rainwater reuse.
With accelerating urbanization, drainage pressure from large buildings and elevated roads has become increasingly prominent. Traditional drainage systems often struggle with water accumulation and inefficient flow. Under the Sponge City initiative’s emphasis on “orderly discharge,” siphonic roof drains have emerged as a standout solution thanks to their unique hydraulic design.
By harnessing siphonic action to create powerful negative pressure, these drains enable rapid removal of stormwater from roofs, plazas, and other surfaces—significantly outperforming conventional rainwater outlets. Together with PP modular rainwater units, diversion chambers, and other components, they form a coordinated system that not only ensures structural safety but also creates crucial time windows for rainwater harvesting and reuse. In this way, siphonic roof drains act as “bridging equipment” that connects efficient building drainage with ecological water conservation.
Collecting rainwater is only the first step—how can we transform it into clean water resources that meet reuse standards? The integrated rainwater purification unit is the core solution to this challenge. By combining multiple processes including filtration, adsorption, and disinfection, it targets and removes contaminants such as suspended solids, heavy metals, and microorganisms present in rainwater. After preliminary interception and diversion, this system further purifies rainwater to meet different standards for greening, toilet flushing, and industrial water use—enabling water-saving equipment to truly support the green transformation of the economy and society, and contributing to the practical implementation of water resource conservation and intensive utilization goals.