How should wastewater from an all-in-one water purifier be disposed of?

Release Date:

2026/04/23

How to Treat Effluent from Integrated Water Purifiers Effluent from integrated water purifiers can be managed through recycling, compliant discharge, or centralized treatment. The specific approach should be determined based on a comprehensive assessment of water quality, flow rate, and local environmental regulations.

I. Sources and Characteristics of Effluent

Effluent generated during the operation of integrated water purifiers primarily includes:

Backwash Drainage: Water from periodic backwashing of filter beds and sedimentation tanks, containing suspended solids (SS) and residual flocculants;
Sludge Discharge: Sludge removed from sedimentation units, containing organic matter and colloidal particles;
Concentrated Effluent (e.g., RO concentrate): If the system includes reverse osmosis (RO) technology, it will produce concentrated water with high salt content and high TDS.

This type of wastewater typically does not contain toxic or hazardous substances, but SS and COD levels may exceed standards; direct discharge can easily cause pipeline blockages or environmental pollution.

II. Common Treatment Methods

Recycling

Collect backwash water in an equalization tank; after natural sedimentation, return it to the front end of the water purifier for reprocessing;
Concentrated water can be used for site ground washing, landscaping irrigation, or dust suppression, achieving resource recovery.

Compliant Discharge

Wastewater must first be treated in a sedimentation tank or small-scale sludge dewatering unit to ensure SS ≤ 20 mg/L and a pH of 6–9. Only after meeting Class B standards of the “Emission Standards for Pollutants from Urban Sewage Treatment Plants” may it be discharged into municipal sewer systems or natural water bodies.

Centralized Treatment

For larger-scale systems, it is recommended to install integrated wastewater treatment equipment using a “equalization + sedimentation + biological treatment” process to ensure the effluent meets the “Comprehensive Wastewater Discharge Standard” (GB 8978—1996).

Evaporation Concentration (Suitable for High-Salinity Wastewater)

For concentrate generated by reverse osmosis, small-scale evaporation units can be used for volume reduction, thereby decreasing the discharge volume and facilitating subsequent disposal.

Note: It is strictly prohibited to discharge untreated wastewater directly into storm drains or farmland to prevent pollution.

III. Practical Application Recommendations
Small-scale residential systems: It is recommended to install a wastewater collection tank for non-potable uses such as toilet flushing and floor mopping to improve water resource utilization;
Industrial or centralized water supply scenarios: Sludge drying tanks or filter presses should be installed to achieve solid-liquid separation, reduce sludge volume, and facilitate removal and disposal.

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The Function of an All-in-One Water Purifier