Find HS Code and trade information for 起泡器aerator

Aerator

An aerator is a device used to introduce air into liquids, typically water, to increase its oxygen content and improve its quality. The term "aerator" encompasses a broad range of devices with varying designs and applications.

Material

Aerators are constructed from a diverse range of materials, selected based on the intended application and the liquid being aerated. Common materials include:

• Plastics: Often used in aquarium aerators and low-cost applications due to their affordability and corrosion resistance.
• Stainless Steel: Preferred for industrial and potable water applications due to its durability, corrosion resistance, and hygienic properties. Grades like 304 and 316 stainless steel are frequently employed.
• Ceramic: Utilized in some specialized applications due to its resistance to wear and chemical attack.
• Rubber/Silicone: Used for flexible components like diffusers and tubing.
• Bronze: Found in older or specialized applications, offering corrosion resistance.

Purpose

The primary purpose of an aerator is to enhance the oxygen levels within a liquid. This serves several key functions:

• Improved Water Quality: Increasing dissolved oxygen is crucial for maintaining healthy aquatic ecosystems (aquariums, ponds, etc.).
• Gas Removal: Aeration can remove dissolved gases like carbon dioxide, methane, and hydrogen sulfide, improving taste and odor.
• Volatile Organic Compound (VOC) Removal: Some aeration systems are designed to strip VOCs from water.
• Mixing and Circulation: The process of introducing air often creates mixing, which helps distribute oxygen evenly and prevent stratification.
• Biological Treatment: In wastewater treatment, aeration supports the growth of beneficial bacteria that break down organic pollutants.

Function

Aerators function by increasing the surface area of the liquid exposed to air. This is achieved through various methods:

• Diffusion: Air is forced through a porous material (diffuser) creating small bubbles that rise through the liquid, transferring oxygen as they ascend.
• Mechanical Mixing: Impellers or turbines agitate the liquid, creating turbulence and increasing air-water contact.
• Venturi Effect: A constriction in a pipe creates a vacuum, drawing air into the liquid stream.
• Spray Aeration: Liquid is sprayed into the air, maximizing surface area for oxygen absorption.

Usage Scenarios

Aerators are employed in a wide range of applications:

• Aquariums: Maintain oxygen levels for fish and other aquatic life.
• Wastewater Treatment: Support biological processes for pollutant removal.
• Ponds and Lakes: Improve water quality and prevent fish kills.
• Drinking Water Treatment: Remove dissolved gases and improve taste.
• Hydroponics: Provide oxygen to plant roots.
• Wine Making: Oxygenate wine during fermentation and aging.
• Aerobic Digesters: Enhance the breakdown of organic matter.
• Industrial Processes: Various applications requiring oxygenation or degassing.

Common Types

• Air Stone/Diffuser Aerators: Simple devices used in aquariums, consisting of a porous stone connected to an air pump.
• Venturi Aerators: Utilize the Venturi effect to draw air into a liquid stream. Commonly used in plumbing and small-scale applications.
• Surface Aerators: Employ impellers or turbines to agitate the liquid surface and introduce air. Used in ponds, lakes, and wastewater treatment.
• Packed Tower Aerators: Liquid flows down through a tower filled with packing material, while air flows upwards, maximizing air-water contact. Used in industrial applications.
• Spray Aerators: Liquid is sprayed into the air through nozzles, creating a fine mist.
• Subsurface Aerators: Introduce air into the liquid below the surface, minimizing noise and odor.
• Fine Bubble Diffusers: Produce very small bubbles for efficient oxygen transfer, commonly used in wastewater treatment.
• Coarse Bubble Diffusers: Produce larger bubbles for mixing and circulation.

Based on the provided information, the declared goods "起泡器aerator" can be classified as follows:

• 8424820090: This HS code covers mechanical appliances (whether or not hand operated) for projecting, dispersing or spraying liquids or powders; fire extinguishers, whether or not charged; spray guns and similar appliances; steam or sand blasting machines and similar jet projecting machines; parts thereof: Other appliances: Agricultural or horticultural Other. An aerator, used for dispersing liquids, potentially falls under this category if it's used in agricultural or horticultural applications. The total tax rate is 57.4% (基础关税: 2.4%, 加征关税: 25.0%, 2025.4.2后加征关税: 30.0%).
• 8424899000: This HS code covers mechanical appliances (whether or not hand operated) for projecting, dispersing or spraying liquids or powders; fire extinguishers, whether or not charged; spray guns and similar appliances; steam or sand blasting machines and similar jet projecting machines; parts thereof: Other appliances: Other. If the aerator doesn't specifically fall into the agricultural/horticultural category, it may be classified as a general "Other" appliance. The total tax rate is 56.8% (基础关税: 1.8%, 加征关税: 25.0%, 2025.4.2后加征关税: 30.0%).

According to the provided reference material, the HS code options related to '起泡器aerator' are limited, with only the following 2 found.

Please note that the applicable tax rate for both HS codes will be affected by the changes on 2025.4.2, with the 加征关税 increasing to 30.0%.