SGY-B Grease Separation and Sewage Discharge System

I. Product Overview

The SGY-B model grease separation and sewage discharge unit is specialized equipment designed for separating and removing grease from food service wastewater. It primarily treats wastewater containing animal and vegetable fats/oils, floating matter lighter than water, and solid debris such as rice, vegetable leaves, bones, fish bones, and other food scraps. It is widely used in hotels, restaurants, guesthouses, schools, and canteens.

The SGY-B unit does not include a lifting/pumping discharge system; it is suitable for installation on the ground floor or higher levels, where treated wastewater can flow by gravity into the sewage piping network.

II. Working Principle

The SGY-B unit consists of a screen-based debris removal zone, an oil-water separation zone, an oil collection and discharge zone, a sludge collection and discharge zone, a sewage lifting zone, as well as mechanisms for discharging debris, oil, and sludge, and a control system.

The unit's inlet connects to the food service wastewater collection pipe. Wastewater first enters the screen-based debris removal zone, where large solids and most debris are filtered out and periodically discharged into a debris collection bin. The remaining oil-water mixture flows into the oil-water separation zone; due to the difference in specific gravity—with oil being lighter than water—the oil naturally floats to the surface in the oil collection zone, from where it can be periodically drained into an oil collection container. Turbid sludge settles in the sludge collection zone and is subsequently discharged into a sludge collection container. The treated wastewater flows into the sewage lifting zone, which is equipped with a liquid level controller to automate the start and stop of the discharge pump. The pump lifts the wastewater and discharges it into the municipal sewage network. The animal and vegetable oil content in the treated wastewater complies with the CJ343 standard ("Quality Standards for Wastewater Discharged into Urban Sewers"), remaining at or below 50 mg/L. III. Operating Conditions:

The quality and temperature of the catering wastewater treated by the grease separation and discharge equipment must meet the following conditions:

1. Density of animal and vegetable oils/fats in the wastewater: 0.90 g/cm³ – 0.95 g/cm³.

2. Oil/fat content: ≤ 300 ml/L.

3. Suspended solids (SS) concentration: ≤ 285 mg/L.

4. Wastewater temperature: Above 5°C.

IV. Control System

The control system for the SGY-B model grease separation and discharge equipment operates on AC 380V, 50Hz power. The control cabinet supports both manual and automatic start/stop functions for the water pumps. Automatic operation is governed by signals from a water level sensor located in the wastewater lifting chamber, which triggers the pumps based on water level fluctuations; manual control is also available.

When the water level in the lifting chamber exceeds the normal operating range and reaches the alarm level, the alarm sensor sends a signal; the control cabinet then issues an audible and visual alarm and forces both pumps to start for drainage. Once the water level drops to the low-level cut-off point, the control cabinet automatically stops the pumps.

The dual pumps serve as backups for each other and operate in an automatic alternating cycle; if the duty pump fails, the standby pump automatically takes over.

The electrical control cabinet manages the heating unit via manual or automatic modes. In automatic mode, the heating unit operates according to preset time intervals; in manual mode, the unit can be easily turned on or off as needed.

Control of the SGY-B equipment can also be customized via PLC programming to meet specific site requirements. Features include an RS-485 interface, digital touchscreen operation, and remote control capabilities via computer. This enables intelligent automation, allowing for scheduled or condition-based automatic discharge of slag, grease, and sludge, thereby eliminating the need for dedicated personnel to operate or monitor the system and reducing labor costs.