- Pre-assembled and factory-tested package systems available for various treatment processes, complete with all piping, instruments, and controls
- Can be designed for installation into modified shipping containers or modular buildings
- Ideal for remote locations to reduce field installation costs
- Simple operation and maintenance requires minimal operator supervision
- Compact design with high rate clarifiers and filters results in smaller footprint
Napier-Reid designs and fabricates package water treatment plants to produce potable water for municipal applications or quality water for industrial applications. They can remove suspended solids, turbidity, colour, odour, and TOC from the raw feed water.
Purification is accomplished in several stages such as chemical mixing, coagulation, flocculation, clarification, filtration, and disinfection. The main plant components include rapid mixer, flocculator, clarifier with tube settlers, or dissolved air flotation system and a high rate gravity filter.
- Plant’s three-stage treatment process: Chemical Conditioning, Clarification, and Filtration produces highly pure water that meets or exceeds all regulatory water quality standards while minimizing capital and operating costs.
- Highly stable process produces potable water even during peak flow conditions, very low influent water temperature, or fluctuations in raw water qualities like turbidity and temperature.
- Custom designed and fabricated to suit the process and layout requirements.
- Highly efficient and robust rapid mixers, flocculators, and clarifiers.
- No moving or rotating parts in clarifier with tube-settlers.
- Depending upon application, the filter cell is provided with dual media, multi-media, GAC, greensand, or MD-80 (for Fe, Mn and H2S removal).
- High rate gravity filtration cells with an efficient underdrain system that evenly collects the filtered water and distributes the backwash water.
- Air scour system included to enhance backwash efficiency.
- Easy to install and start-up.
- High degree of automation provided for least operator attention.
- The package plant can be easily transported to project’s site.
- Material of construction: Marine grade aluminum alloys, stainless steel, or epoxy coated carbon steel.
- No addition of costly chemicals or special microsand in clarifier, resulting in reduced operating cost.
- No recirculation and washing of special microsand, resulting in lower power consumption.
- Highly efficient backwash system in filters results in cleaner media, hence longer filter run time, leading to lower power consumption.
- Robust system design and quality components results in minimal maintenance.
Complete Package Plant
Stage 1. Chemical Conditioning
In the first stage of the package water treatment plant, the raw water is fed into a rapid mixing zone where neutralizing and coagulating chemicals are added. Coagulants neutralize the charge and promote collisions between the small suspended particulates, called colloids, enabling them to form flocs. The coagulated water enters the flocculation tank. A coagulant aid or polymer is usually added to strengthen the floc bonding. Slow stirring motion in the flocculation chamber promotes collision between the forming precipitates and the remaining contaminant particles to form larger flocs.
Stage 2. Clarification
The coagulated and flocculated water is evenly distributed across the clarifier using well designed distribution laterals under the tube settlers. Tube settlers are used to promote rapid clarification. The tube settler consists of square tubes, usually inclined at 60 degrees, which causes the “captured” floc particles to settle by gravity to the bottom of the clarifier and form sludge. The sludge accumulates in the bottom of the clarifier’s hopper and is withdrawn through a desludge valve at regular intervals. A collection system on the surface collects and directs the clarified water to the filters.
Dissolved air flotation clarifiers can also be provided for high rate clarification.
Stage 3. Filtration
Clarified water enters the high rate gravity filter for removal of the remaining finer solid particles. Based on the application, the filter media can be dual media, multi-media, GAC, greensand, or MD-80. The water passes through the layers of the media and is collected by the under drain system. This filtered water is then sent for disinfection or further processing.
Optional Ultraviolet (UV) disinfection expands the protection offered by Napier-Reid’s plants, ensuring complete inactivation of waterborne pathogens including Cryptosporidium and Giardia.