Modular composite advanced treatment system and operation method for low-concentration heavy metal wastewater

Abstract

The invention relates to a modularized composite deep processing system for low-concentration heavy metal wastewater and an operation method thereof. The system comprises a water distribution system,a water collecting system and modularized adsorption units, a water collecting device comprises water collecting tanks and a water collecting buffer pool, the water collecting tanks are provided withat least two layers, the water collecting buffer pool and the water collecting tanks with the layers are stacked from bottom to top, a water distribution device includes an inlet pipe and a return pipe, the inlet pipe is connected to the inlet ends of the other water collecting tanks beside the bottom layer, the return pipe is disposed between the water outlet end of the upper water collecting tank and the water inlet end of the lower water collecting tank, and each of the water collecting tank is provided with the modularized adsorption unit. The low-concentration wastewater containing heavymetals is distributed to the water collecting device through the water distribution device, the heavy metal in the water is absorbed and removed by modified zeolite adsorption, then the heavy metal onan adsorbent is enriched and transferred by the plants, and deep treatment of heavy metal wastewater is achieved by regularly changing the plants. The system realizes deep treatment of low-concentration heavy metal wastewater, and has flexible application and remarkable treatment effect.

Description

technical field

[0001] The invention relates to a system for advanced treatment of low-concentration heavy metal wastewater and an operating method of the system, belonging to the technical field of heavy metal-polluted wastewater treatment. Background technique

[0002] At present, for the supervision of enterprise sewage discharge, the management method of sewage discharge standard is generally implemented at home and abroad, that is, the concentration of treated sewage pollutants is reduced to the specified low concentration limit, and then the discharge is allowed, and the tail water discharged up to the standard still contains low concentrations of pollutants. Unlike organic pollutants, heavy metals do not degrade or volatilize in nature, and continue to accumulate once they enter the environment. For enterprises involved in heavy metals, after their low-concentration heavy metal wastewater is discharged into the environment, it will still bring significant harm to hum...

Examples

Embodiment

[0094] The effluent quality of the sewage discharge outlet of an electroplating factory meets the standard discharge, and the concentration of heavy metal Cd is 0.5mg / L at this time.

[0095] Adopt the system of the present invention to carry out compound processing, processing scale 50m 3 / d. Seven adsorption units are arranged in each layer of water collection tank, the size of the adsorption filling layer in each water collection tank is 65cm×65cm×5cm, and the filling capacity of each adsorption unit is about m=36kg. The plant cultivation tray 28 in the three-layer water collection tank is matched with planting aquatic plants Erythrina chinensis and cattail, and in the water collection buffer tank 15, the aquatic plant reed is planted.

[0096] Wastewater containing low-concentration heavy metal Cd has reached a concentration of 0.002 mg / L through this modular composite advanced treatment method. After 6 months of continuous operation, the quality of the effluent is stable...

technical field

[0001] The invention relates to a system for advanced treatment of low-concentration heavy metal wastewater and an operating method of the system, belonging to the technical field of heavy metal-polluted wastewater treatment. Background technique

[0002] At present, for the supervision of enterprise sewage discharge, the management method of sewage discharge standard is generally implemented at home and abroad, that is, the concentration of treated sewage pollutants is reduced to the specified low concentration limit, and then the discharge is allowed, and the tail water discharged up to the standard still contains low concentrations of pollutants. Unlike organic pollutants, heavy metals do not degrade or volatilize in nature, and continue to accumulate once they enter the environment. For enterprises involved in heavy metals, after their low-concentration heavy metal wastewater is discharged into the environment, it will still bring significant harm to hum...

Examples

Embodiment

[0094] The effluent quality of the sewage discharge outlet of an electroplating factory meets the standard discharge, and the concentration of heavy metal Cd is 0.5mg / L at this time.

[0095] Adopt the system of the present invention to carry out compound processing, processing scale 50m 3 / d. Seven adsorption units are arranged in each layer of water collection tank, the size of the adsorption filling layer in each water collection tank is 65cm×65cm×5cm, and the filling capacity of each adsorption unit is about m=36kg. The plant cultivation tray 28 in the three-layer water collection tank is matched with planting aquatic plants Erythrina chinensis and cattail, and in the water collection buffer tank 15, the aquatic plant reed is planted.

[0096] Wastewater containing low-concentration heavy metal Cd has reached a concentration of 0.002 mg / L through this modular composite advanced treatment method. After 6 months of continuous operation, the quality of the effluent is stable...

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