Biological Pretreatment and Urban Graded Water Supply: Enhancing Water Quality for Sustainable Living

In the constant pursuit of ensuring safe drinking water, the escalating challenges of water source pollution and the ever-rising standards for urban drinking water quality have necessitated innovative approaches. Traditional water purification methods are often insufficient in effectively treating contaminants such as ammonia, algae, and unpleasant odors. Simultaneously, the disorganized functionality of urban water supply pipelines contributes to secondary pollution, posing potential health risks. As urbanization progresses and environmental industries develop, the study and application of biological pretreatment and graded water supply systems play an increasingly pivotal role in elevating water quality, safeguarding drinking water standards, and fostering societal, economic, and environmental development.

1. Biological Pretreatment:

1.1 Definition:

Biological pretreatment involves using biological processes as a precursor to conventional water purification methods like coagulation, sedimentation, and filtration. Its application in urban water supply has gained prominence in addressing pollutants that conventional methods struggle to remove effectively, including ammonia nitrogen, nitrite, nitrate, algae, and unpleasant odors. Additionally, it demonstrates notable efficacy in treating organic matter, turbidity, color, and iron and manganese.

1.2 Main Processes of Biological Pretreatment:

The primary processes of biological pretreatment include biological filter reactors, biological rotating disc reactors, biological contact oxidation, biological fluidized beds, and land treatment systems employing permeable soil.

1.3 Effects and Influencing Factors:

Studies in various regions, such as the Huaihe River (Bengbu section), have shown substantial removal rates for ammonia nitrogen during biological contact oxidation pretreatment. Factors like hydraulic load, organic load, and influent pollutant concentration influence the performance of biological pretreatment. Elevated pollutant concentrations can enhance removal rates within a certain range, making it advantageous for improving removal efficiency.

1.4 Significance in Urban Water Supply:

In addressing prevalent issues in urban water purification, such as widespread and intricate water source pollution, limited financial resources, and a lack of integrated technologies for removing micro-pollutants, biological pretreatment stands out as an economically viable solution. Its ability to significantly improve the efficacy of subsequent processes like coagulation and sedimentation, coupled with the potential to reduce coagulant dosage, highlights its importance in ensuring safe drinking water.

2. Graded Water Supply:

2.1 Concept:

Graded water supply involves providing water with varying qualities based on the specific requirements of different urban water users. It tailors the supply to meet the distinct needs of citizens, delivering high-quality drinking water for consumption and bathing services, while simultaneously creating a separate system for non-potable water for applications like landscaping, vehicle washing, toilet flushing, and industrial cooling.


The water quality of urban areas directly reflects their level of modernization. The development of biological pretreatment and graded water supply systems not only guarantees water quality but also forms the foundation for the realization of direct drinking water. This synergy is crucial for ushering in a new era of urban living. As the tourism industry becomes a comprehensive indicator of urban modernization, the urban water supply system, as a supporter of green ecological tourism, is on the brink of a revolution. The evolution of biological pretreatment and graded water supply in urban settings will pose challenges in areas such as equipment production and operation, filler research and development, regional pipeline renovations, and deep purification of water quality. Simultaneously, it presents a unique opportunity for the development of the environmental protection industry in China.

Xian CHIWATEC Water Treatment Technology es una empresa de alta tecnología especializada en varios dispositivos de procesamiento de agua. Aparte de estos productos individuales, que cubren una serie de tipos y series, también podemos ayudar con proyectos de ingeniería integrales relacionados. Gracias a nuestro arduo trabajo y dedicación desde nuestra fundación, ahora somos uno de los fabricantes de equipos de tratamiento de agua de más rápido desarrollo en el oeste de China.

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