What is high rate solid contact clarifier?

The High Rate Solid Contact Clarifier (HRSCC) has been designed such that coagulation,flocculation, settling and sludge remove are combined in a single tank. The HRSCC is circular in shape and is fitted with a draft tube at the center, a flocculation chamber and a clarification zone.

What is a solids contact clarifier also called?

Various designs exist depending on process requirements, however Solids Contact Clarifiers are the most common design for softening, turbidity reduction, metals removal, flocculation, sedimentation, and related functions. They may also be referred to as reactor clarifiers or flocculating clarifiers in some cases.

How does a solids contact clarifier work?

How It Works. Influent flow is mixed with previously settled solids within the draft tube. Gentle mixing within the reaction well promotes agglomeration of floc particles and/or chemical precipitates. The aggregated solids settle out more rapidly in the clarification area.

What is overflow rate in clarifier?

The weir overflow rate is the number of gallons of wastewater that flow over one lineal foot of weir per day. The typical WOR range for primary clarifiers is 10,000 to 20,000 gallons per day per lineal foot of weir.

What is Hrscc?

The solids contact type clarifier or HRSCC is a high rate water treating clarifier, which produces treated water of highest quality with minimum time, space and chemicals.

How does a Clariflocculator work?

In the Clariflocculator, the water enters the flocculator, where the flocculating paddles enhance flocculation of the feed solids. As heavy particles settle to the bottom, the liquid flows radially upward in the clarifier zone,. The clarified liquid is discharged over a peripheral weir into the peripheral launder.

Which chemical is used in clarifier?

These clarifiers are termed “upflow” because the water flows up toward the effluent launders as the suspended solids settle….Chapter 05 – Clarification.

Name	Ferric chloride
Typical Strength	60% FeCl3, 35-45% FeCl3
Typical Forms Used in Water Treatment	crystal, solution
Density	60-64 lb/ft3 11.2-12.4 lb/gal
Typical Uses	primary coagulant

What are clarifiers used for?

Clarifiers are settling tanks built with mechanical means for continuous removal of solids being deposited by sedimentation. A clarifier is generally used to remove solid particulates or suspended solids from liquid for clarification and (or) thickening.

What is the purpose of clarifier?

What is solid loading rate?

Solids loading rate (SLR) SLR is the amount of solids per day that can be removed per square foot of surface area by a clarifier (lbs/day/ft²). If the SLR increases above the design limits of the clarifier, there will be an increase in effluent solids.

What is a Clariflocculator?

Clariflocculator is a combination of flocculation and clarification in a single tank. It has two concentric tanks where inner tank serves as a flocculation basin and the outer tank serves as a clarifier.

What is the purpose of a clarifier?

What is the unit of Clariflocculator?

The combined unit of flocculator and clarifier is known as clariflocculator in waste water treatment process. Clariflocculator shall have two concentric tanks with inner tank serving as flocculation basin and outer tank serving as clarifier.

What is the function of clarifier?

What is clarification process?

Clarification is an essential step in a water or wastewater treatment process to remove suspended solids through gravity settling, providing a clarified liquid effluent. First, understanding primary and secondary clarification is needed to determine the appropriate technology to meet treatment requirements.

What is CRT in wastewater treatment?

Variations on a theme. In MCRT, the M is for “mean,” which is a substitute for “average.” The remaining letters, CRT, represent cell residence time — how long a particular bacterial cell, or a pound of bacteria, remains in the activated sludge secondary treatment train. MCRT is normally expressed in days.

Why choose solids contact clarifier?

For high upflow rates, tube settlers can be added to increase the effectiveness of gravity sedimentation. Because the Solids CONTACT CLARIFIER re-circulates previously settled solids many times over, less chemical input is needed and results are superior to conventional treatment methods.

What is the flow rate and size range of clarifiers?

Wide flow rate and size range – flow rates as high as 2500 m/hr and sizes as large as 25.0 m x 3 25.0 m. Rise rates are higher than conventional clarifiers and depending on the type of application, can be as high as 10 – 12 m/hr. Sludge concentrations up to 3% are achieved depending on the application.

What is the effect of mixing in the clarification area?

Gentle mixing within the reaction well promotes agglomeration of floc particles and/or chemical precipitates. The aggregated solids settle out more rapidly in the clarification area. Even better clarity is achieved when particles become enmeshed in a sludge blanket layer.