GB 37483-2019Minimum allowable values of energy efficiency and energy efficiency grades for rotary aerator in wastewater treatment (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard was proposed by and is under the jurisdiction of the Standardization Administration of China.

The main drafting organisations of this standard include the China National Institute of Standardization, MCC Huatian Nanjing Engineering and Technology Corporation, Everbright Water (Shenzhen), MCC Huatian Engineering and Technology Corporation, the Lanshen Group, the Jiangsu Tianyu Environmental Protection Group, Nanjing Bet Environmental Protection General Equipment Manufacturing, the Haitian Water Group, the National Quality Supervision and Inspection Centre for Environmental Protection Equipment (Zhejiang), Everbright Environmental Protection (China), Jiangsu General Environmental Engineering and China Jinjiang Environment Holding.

1 Scope

China's compulsory energy efficiency standard for the rotary aerators used in wastewater treatment. Aeration is where the electricity goes in a treatment works: blowing or beating oxygen into the mixed liquor typically accounts for more than half of the plant's power bill, and it runs day and night for the life of the plant. A rotary aerator does that job mechanically, by driving a rotor through the surface of the water so that air is entrained and oxygen dissolves, and its efficiency is measured as the mass of oxygen transferred per unit of electrical energy consumed. Because two machines of the same nominal duty can differ by a factor of two on that number, the state fixes a floor below which a machine may not be sold and a ladder of grades above it. This standard specifies the terms and definitions, the energy efficiency grades, the technical requirements and the test methods for rotary aerators, and applies to the vertical-shaft, horizontal-shaft and self-priming impeller machines driven by an electric motor that are used in industrial wastewater and municipal sewage treatment processes and in the re-oxygenation of water bodies. It is used by aerator manufacturers, by the designers of treatment works and by the bodies that certify energy labels.

This standard specifies the terms and definitions, the energy efficiency grades, the technical requirements and the test methods for rotary aerators used in wastewater treatment.

This standard applies to the motor-driven vertical-shaft rotary aerators, horizontal-shaft rotary aerators and self-priming impeller aerators used in the treatment processes for all kinds of industrial wastewater and municipal sewage and in the re-oxygenation of water bodies.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB 18613 Minimum allowable values of energy efficiency and energy efficiency grades for small and medium three-phase asynchronous motors.

JB/T 12579 Multi-function high efficiency aeration equipment.

3 Terms and definitions

The terms and definitions given in JB/T 12579 and the following apply to this document.

3.1 Energy efficiency ratio for rotary aerator: under the specified test conditions, the ratio of the mass of oxygen transferred by the rotary aerator per unit of time into clean water whose dissolved oxygen is zero, to the total electrical energy consumed by the complete machine. NOTE: the unit is kilograms per kilowatt hour, kg/(kW.h), calculated on the mass of dissolved oxygen.

3.2 Minimum allowable value of energy efficiency for rotary aerator: under the specified test conditions, the lowest energy efficiency ratio permitted for a rotary aerator.

4 Energy efficiency grades

4.1 The energy efficiency of rotary aerators is divided into 3 grades (see Table 1), of which grade 1 is the most efficient. The energy efficiency ratio of a rotary aerator of each grade shall not be lower than the value specified in Table 1. Table 1 sets a value for each grade and for each of the three machine types covered - vertical-shaft rotary aerator, horizontal-shaft rotary aerator and self-priming impeller aerator.

4.2 The energy efficiency ratio of a rotary aerator is calculated by formula (1): E = SOTR / P, where E is the energy efficiency ratio of the rotary aerator under standard conditions, in kilograms per kilowatt hour, calculated on the mass of dissolved oxygen; SOTR is the oxygenation capacity of the rotary aerator under standard conditions, in kilograms per hour, calculated on the mass of dissolved oxygen; and P is the input power of the motor, in kilowatts.

6 Test methods

The test methods are carried out as specified in JB/T 12579.