SAZ ENVIRO, a leading Primary Circular Clarifier manufacturer in India provides efficient sedimentation for raw wastewater that has undergone pre-screening to remove large debris and grit. These clarifiers are essential for primary wastewater treatment, serving as the first step in the removal of suspended solids, oils, and grease. The primary circular clarifier produces a homogeneous liquid suitable for biological treatment and generates sludge that can be processed separately.

Influent and Tank Design

In the SAZ ENVIRO’s Primary Circular Clarifier, proper tank sizing and low-energy inlet design are crucial for effective sedimentation. The goal is to allow sludge to settle at the bottom of the tank while floating solids such as grease, oils, and other light debris rise to the surface. SAZ ENVIRO offers customized inlet designs, including the use of an Energy Dissipating Inlet (EDI) when a standard center inlet does not suffice. The EDI helps distribute the flow evenly into the flocculation zone, creating a tangential stirring action that enhances the separation of suspended solids. This reduces the overall settling time and ensures better floc formation, improving the efficiency of the clarifier.

SAZ ENVIRO offers a range of EDI designs tailored to meet the specific requirements of different wastewater streams. These designs vary based on the influent characteristics, ensuring that even challenging wastewater conditions are managed effectively. Additionally, mechanical flocculation and the use of chemical coagulants can be integrated for applications requiring enhanced floc formation. An enlarged feedwell can also be designed to increase residence time, aiding in the flocculation process and allowing for more effective settling of solids.

Drives and Sludge Collection Mechanisms

A critical aspect of the SAZ ENVIRO Primary Circular Clarifier is its robust drive system, which operates continuously to remove settled sludge from the tank. The sludge removal process is facilitated by durable bottom scraping rakes that use multiple blades, angled to ensure complete capture of settling sludge and its transportation to the central sludge well.

SAZ ENVIRO also offers alternative sludge collection mechanisms such as spiral scrapers, which can be employed in place of traditional angled plow scrapers. These spiral scrapers can more effectively handle heavy sludge loads in certain applications, reducing downtime and improving overall sludge management.

For drive systems, SAZ ENVIRO provides both cast iron worm gear and fabricated steel precision gear drive assemblies, ensuring long-term reliability and ease of maintenance. The drives are available in a variety of configurations, including truss-type or cable-supported rake mechanisms, depending on site-specific needs.

Skimming and Scum Removal

In primary wastewater clarifiers, floating matter like oils, grease, plastics, and leaves must be efficiently removed to ensure proper treatment. SAZ ENVIRO’s skimming system utilizes a rotating skimmer arm, supported by the sludge rake, to push floating matter toward the tank’s scum collection area. The skimmer arm is equipped with wipers that sweep floating debris over the beach plate and into a scum box for removal. From there, the scum is transferred to the scum outlet piping for further treatment or disposal.

For more demanding applications, SAZ ENVIRO offers a ducking skimmer system with fixed, full-radius collection troughs to maximize scum removal. The unique 3-axis pivoting scum wiper blade design ensures constant contact with the scum beach, significantly improving scum removal efficiency. This system is especially useful in situations with heavy scum loads or varying scum types.

Clarifier Effluent and Discharge

The clarifier effluent produced by the Primary Circular Clarifier is homogeneous and ready for downstream biological treatment, typically in an aeration tank. To ensure high-quality effluent, a scum baffle is installed, preventing floating debris from reaching the effluent launder. This ensures that only properly clarified water leaves the system.

The V-notch weir is carefully designed to ensure uniform laminar flow throughout the clarifier. This weir helps to minimize turbulence, allowing for even distribution of the effluent. SAZ ENVIRO offers a range of construction materials for weirs, baffles, and launders, including stainless steel, FRP (Fiber Reinforced Plastic), aluminum, and galvanized steel, allowing for greater durability and corrosion resistance depending on the wastewater characteristics.

In addition to standard weirs and baffles, Stamford (density current) baffles can be incorporated to control density currents within the clarifier, further improving sedimentation efficiency. Launder covers are also available to protect the clarified effluent from debris or contamination, making SAZ ENVIRO systems adaptable to the most stringent environmental and operational requirements.

Advanced Features and Customization

As a leading Circular Clarifier manufacturer, SAZ ENVIRO offers a range of customizable features to meet specific operational needs. These include:

• EDI designs for enhanced flow distribution and faster settling times
• Mechanical flocculation and chemical coagulant systems for improved treatment
• Spiral scraper options for sludge removal in more demanding applications
• Customizable scum removal systems with advanced skimming technology
• Robust gear drive assemblies for reliable long-term operation

In summary, SAZ ENVIRO Primary Circular Clarifiers offer high-efficiency sedimentation, superior sludge handling, and customizable design features tailored to industrial and municipal wastewater applications. With advanced inlet designs, durable sludge collection mechanisms, and effective skimming solutions, SAZ ENVIRO systems provide reliable performance and long-term operational efficiency, ensuring optimal results for primary wastewater treatment.

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