A treatment facility for pollutants in stormwater runoff

Abstract

The invention discloses a facility for treating pollutants in rainwater runoff. The facility comprises a water inlet pipe, a covering layer, a vegetation layer, an adsorption layer, an iron-improved sand layer, a submersion layer, a gravel layer, a water outlet pipe and a breathable facility, wherein the rainwater runoff enters the facility from the water inlet pipe and flows out from the water outlet pipe after being treated by units; the breathable facility is arranged in the middle of the iron-improved sand layer and above the adsorption layer, and the iron-improved sand layer and the adsorption layer are communicated through upright pipes which extend to the position above the covering layer; the treating units sequentially comprise the covering layer, the vegetation layer, the adsorption layer, the iron-improved sand layer and the submersion layer from top to bottom; hardwood bark, gravel in light color and sand are arranged on the cover layer; the vegetation layer comprises preferable plants and degrading bacterium immobilized particles; the adsorption layer comprises modified peat containing a proper amount of sludge and modified zeolite; the iron-improved sand layer can keep Fe3<+> and maintain an aerobic condition; the submersion layer has wood flour, newspaper and other organic matters and keeps an anaerobic condition. Various pollutants in the rainwater runoff are effectively removed due to special interlayer arrangement of the facility and combination of biological enhanced biological treatment and adsorption treatment.

Description

technical field [0001] The invention relates to pollutant treatment technology and belongs to the technical field of environmental protection, in particular to a pollutant treatment facility in rainwater runoff. [0002] In the process of urbanization, impermeable surfaces (such as roads, parking lots and roofs, etc.) are also increasing, resulting in a corresponding increase in stormwater runoff. People's living and production activities have caused urban rainwater runoff to contain a large amount of pollutants, including suspended solids, nutrients, organic matter, pathogens, heavy metals, etc. If these untreated pollutants are directly discharged into water bodies, they will cause various Environmental concerns (including toxicity, pathogenicity and hygiene) of receiving water bodies. Among them, heavy metal substances are not easy to be biodegraded, and can be converted into more toxic metal compounds under the action of microorganisms in water bodies, and enter the human...

AI Technical Summary

Problems solved by technology

The existing biochemical treatment technology in my country has a good effect on the removal of nitrogen and phosphorus, but it has high requirements for operation and control, and is easily affected by factors such as temperature, pH, and dissolved oxygen. The removal of nitrogen and phosphorus pollutants in rainwater runoff The application value is low; chemical methods are used to remove nitrogen and phosphorus pollutants, the cost of chemicals is high, and secondary pollution is easy to occur; the air flotation method has a better effect on removing nitrogen and phosphorus attached to suspended solids, and it has a better effect on removing nitrogen and phosphorus dissolved in rainwater. , Phosphorus removal rate is low; plant floating islands and ecological wetlands usually need to occupy a large area, and it is difficult to implement in places such as road sides, residential areas and villas, and pollutant-degrading bacteria in facilities are easily interfered by the competition of indigenous bacteria. It takes a long time to cultivate degrading bacteria in new areas, and only rely on ecological treatment, the treatment effect is limited

Biological denitrification requires high reaction conditions. Nitrification requires aerobic conditions, and denitrification requires anoxic conditions. The current facilities have hardly created effective reaction conditions.

Images