---
title: "Underground A2O Wastewater Treatment Equipment"
description: "Underground integrated wastewater treatment equipment using the A2O process for nitrogen and phosphorus removal, with PLC control. Request specs today."
url: https://www.waste-water-equipment-factory.com/products/sewage-treatment-plants/a2o-integrated-sewage-treatment-plant/
updated: 2026-11-10
---

# Underground A2O Integrated Sewage Plant (WSZ)

This underground integrated wastewater treatment equipment uses the A2O (anaerobic-anoxic-oxic) process to remove organic matter, nitrogen and phosphorus. PLC automatic control provides 24-hour running, and sand plus carbon filter pretreatment options are listed. It suits residential, commercial and municipal projects that need buried biological nutrient removal in a compact footprint.

Product line: [Sewage Treatment Plants](https://www.waste-water-equipment-factory.com/products/sewage-treatment-plants/) · Type: Integrated Sewage Treatment Plants

## Highlights

- A2O anaerobic-anoxic-oxic biological process
- Electric automatic control (PLC), 24-hour running
- 10 kW or 15 kW power; 220V or 380V
- Model WSZ underground design
- CE and ISO listed; 1-year warranty

## Specifications

| Parameter | Value |
| --- | --- |
| Processing Type | A2O process |
| Voltage | 220 V, 380 V |
| Power | 10 kW, 15 kW |
| Warranty | 1 Year |
| Weight (kg) | 4,500 |
| Application | Wastewater Treatment Plant |
| Function | Producing Fresh Water |
| Certification | CE ISO |
| Model | WSZ |
| Control | Electric Auto Control (PLC) |
| Advantage | 24 Hours Automatic Running |
| Pretreatment | Sand Filter+carbon Filter |
| Technology | RO Membrane Filtration |
| Minimum order | 1 set |
| Inspection | Machinery test report and video outgoing inspection |
| Origin | Shanghai, China |

## Applications

- Domestic sewage
- Residential communities
- Municipal wastewater
- Commercial buildings

## FAQ

### What does the A2O process achieve?

A2O combines anaerobic, anoxic and aerobic zones so a single system removes organic matter as well as nitrogen and phosphorus.

### Is it installed underground?

Yes, the equipment is buried, leaving the surface free for green space or parking.

### What capacity can be supplied?

Capacity is configured per project. Send us your daily flow and influent quality and we will size the unit and provide a quotation.

## Get a quotation

Send capacity, application and destination to inquiry@waste-water-equipment-factory.com, WhatsApp +86 176 2154 1688, or use the form at https://www.waste-water-equipment-factory.com/products/sewage-treatment-plants/a2o-integrated-sewage-treatment-plant/#inquiry.