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Clarifiers, Clariflocculators, and Lamella Separators are ubiquitous in wastewater treatment, each having distinct feature in separating suspended solids from liquid streams.
Clarifiers rely only on gravity sedimentation to settle solids, while Clariflocculators combine flocculation and sedimentation for enhanced particle removal. Lamella Separators employ inclined plates to increase settling area within a compact design.
Advent Envirocare has employed all of these clarification technologies, choosing the right one considering factors like space, budget, and treatment objectives. By analysing project specifics, Advent recommends the most suitable clarification technology, ensuring efficient and cost-effective water/wastewater treatment.
HRSCC, or High-Rate Solids Contact Clarification, is a wastewater treatment technology designed to efficiently remove suspended solids and turbidity. It operates by promoting rapid flocculation and settling of particles through enhanced contact with precipitated solids and chemical additives.
HRSCC is good choice for lime softening and silica reduction through chemical precipitation, handling feed water of high turbidity in a compact clarifier. The advantage of HRSCC lies in its ability to create denser flocs within the inner flocculation basin and settle sludge faster.
Advent Envirocare scores in terms of most appropriate usage of conventional technologies to optimize the treatment approach and cost and has successfully employed HRSCC in their projects.
Dissolved Air Flotation (DAF) is a highly effective wastewater treatment technology that is often utilized for the removal of suspended solids, fats, oils, and grease from wastewater streams. In DAF systems, air is dissolved under pressure into the wastewater, creating microbubbles that act onto the suspended particles, causing them to float to the surface from where they are mechanically skimmed off.
Advent Envirocare has been using DAF in its projects for both primary and post-secondary treatments. The former is employed to remove oil & grease along with suspended solids while the latter is used to capture escaping biological solids prior to media filtration.
At Advent Envirocare, alongside our proprietary and advanced global biological treatment technology offerings, we have also worked on conventional wastewater treatment technologies, including Activated Sludge Processes (ASPs) with traditional aeration tanks and secondary clarifiers, as well as innovative solutions like Moving Bed Biofilm Reactors (MBBRs), Integrated Fixed-Film Activated Sludge (IFAS), and Microbial Kinetic Energy (MiKIE) systems.
In MBBRs, plastic media provide a surface area for biofilm growth, allowing microorganisms to attach and degrade organic pollutants efficiently. IFAS systems combine suspended growth and attached growth processes by integrating media into activated sludge tanks, enhancing treatment capacity and nutrient removal capabilities. MiKIE system is also a fixed-film system having fixed blocks of media submerged in wastewater with lower air requirement compared to MBBRs.
In some noteworthy applications, Advent Envirocare has upgraded CETPs with conventional ASPs and have converted an industrial ASP into nitrification-denitrification system for tough application as in coke-oven wastewater treatment for a well-known steel mill.
Filter Presses, Screw Presses, and Centrifuges are sludge dewatering devices widely used in wastewater treatment processes while Thickeners are pretreatment systems used before dewatering.
Filter Presses operate by applying mechanical pressure to a slurry, forcing the liquid through a filter cloth while retaining the solids. These systems are ideal for dewatering chemical sludge and can achieve high solids removal efficiency and lower moisture content in the wet cake.
Screw Presses/Multidisc Volute Presses utilize a screw and disc mechanism to compress the slurry and extract liquid through a perforated screen or otherwise. This method is particularly effective for dewatering sticky biological sludge or mixed sludge and offers continuous operation at low power consumption with minimal operator intervention.
Centrifuges operate by spinning the slurry at high speeds, causing solids to separate and settle at the bottom of the centrifuge bowl while the liquid is discharged. Centrifuges are suitable for applications requiring rapid dewatering and can handle a wide range of sludge types and concentrations.
Belt Presses have continuous rotating polymeric belts onto which the sludge is placed and dewatered. The Press has multitude of rollers to keep the belt rotating while scrapping off the wet cake.
Thickeners can be gravity type with rotating paddles and scrapper, or can be mechanical device such as screw thickener or belt press. Thickeners concentrate the dilute sludge by two to three times, thereby reducing the volume that is to be handled in dewatering device correspondingly.
Overall, each sludge dewatering device has its advantages and is suitable for specific wastewater treatment application. Advent Envirocare specializes in recommending the most suitable technology based on project requirements, ensuring optimal performance and cost-effectiveness in wastewater treatment process.
Pressure Sand Filters (PSF) and Activated Carbon Filters (ACF) are vital components of water and wastewater treatment systems, each having its definite application.
PSFs operate by passing water through a bed of sand under pressure, where suspended solids are trapped, and clean water emerges. These filters are effective for removing suspended solids and turbidity, making them useful for pre-treatment of raw water or post-secondary treatment to capture escaping solids. Multi-grade Filters (MGFs) and Dual Media Filters (DMFs) are variants with multiple grades of sand and additional filter medium such as anthracite respectively.
ACFs utilize activated carbon media to adsorb organic compounds, chemicals, and odours from water/wastewater. As water flows through the filter bed, contaminants are trapped within the porous structure of the carbon, resulting in cleaner water. ACFs are commonly used for removing chlorine, volatile organic compounds (VOCs), and taste and odour compounds from drinking water, and as tertiary filters in wastewater treatment for removal of COD and colour.
Advent Envirocare regularly deploys different configurations for PSFs, increasing their capacity for solid loading and ensuring efficient filtration. For ACFs, Advent generally employs lead and lag configuration to maximize throughput efficiency, ensuring optimal performance and cost-effectiveness in water/wastewater treatment processes.
Demineralized Water Plants (DM), Mixed Bed Plants (MB), and Electro-Deionization Systems (EDI) are pivotal in producing high-purity water for diverse industrial applications, each offering unique advantages and capabilities.
Demineralized Water Plants are generally referred to ion exchange filters used to remove ions and minerals from water, yielding demineralized or deionized water. These plants are vital for applications requiring high purity water, such as for boilers and other process applications.
Mixed Bed Plants integrate cation and anion exchange resins in a single vessel to produce ultra-pure water with low conductivity and minimal ionic impurities. This process yields highly purified water suitable for high-pressure boilers and other critical industrial processes.
Electro-Deionization (EDI) systems employ ion-selective membranes and electrical current to remove ions from water, generating high-purity water without the need for chemical regeneration. EDI is highly efficient and resource-conserving, making it suitable for applications requiring continuous production of ultrapure water, such as semiconductor manufacturing, pharmaceuticals, and high-pressure boilers.
Advent Envirocare has supplied DM and MB plants for specialized water quality requirements such as high-pressure boilers, pharmaceutical grade water and for tissue culture, and now recommends EDI in applications where they fit well.
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