Headworks: One of the Most Important Parts of the Waste System
- Pumps. The first step in the cleaning process is to simply get the water from an influent well (i.e., the place it ends up after its journey through the public ...
- Screening systems. Once the water has been pumped into the headworks, it is sent through a complex set of screens. ...
- Grit removal. ...
- Let experience lead the way. ...
What is the purpose of a wastewater treatment plant?
Sep 09, 2020 · As you might expect from the name, the headworks is the first stage of the water treatment process and, as such, it does a lot of literal heavy lifting. In fact, the purpose of the headworks is to remove large inorganic materials from the wastewater.
What is the best method for wastewater treatment?
Oct 19, 2001 · The " headworks " of a wastewater treatment plant is the initial stage of a complex process. This process reduces the level of pollutants in the incoming domestic and industrial wastewater to a level that will allow the treated wastewater or effluent to be discharged into a stream, river or lake. This treated effluent also may be sprayed onto dedicated land areas …
Why are wastewater treatment plants so important?
Headworks Analysis. The Headworks Analysis (HWA) calculates the flow and pollutant treatment capacity of a wastewater treatment plant (WWTP). It incorporate the WWTP design criteria as well as environmental criteria to protect the receiving stream (NC Water Quality Standards or NPDES limits), the WWTP biomass (inhibition criteria), and the sludge disposal site (40 CFR …
Does the wastewater treatment plant smell bad?
Mar 02, 2020 · A plant’s headworks plays a crucial role in the pretreatment influent for any wastewater treatment facility. It protects the operation of downstream equipment and enhances the efficiency of the overall wastewater treatment process. Because all wastewater debris starts at the headworks, proper screening and debris removal is imperative to the entire wastewater …
What is at the headworks of the plant and what is its purpose?
A plant's headworks plays a crucial role in the pretreatment influent for any wastewater treatment facility. It protects the operation of downstream equipment and enhances the efficiency of the overall wastewater treatment process.Mar 2, 2020
What are the 3 stages of wastewater treatment?
There are three main stages of the wastewater treatment process, aptly known as primary, secondary and tertiary water treatment.Dec 6, 2018
What are the 5 stages of wastewater treatment?
Treatment StepsStep 1: Screening and Pumping. ... Step 2: Grit Removal. ... Step 3: Primary Settling. ... Step 4: Aeration / Activated Sludge. ... Step 5: Secondary Settling. ... Step 8: Oxygen Uptake. ... Sludge Treatment.
What is the function of a primary clarifier?
The primary clarifier is designed to dispose of inorganic solids floating at the surface. It also tackles solids settling at the bottom. In this unit, the sludge is less dense.Feb 15, 2021
Why is wastewater treated with chlorine or UV light?
This includes new plants as well as existing ones that have converted from chlorine. UV is the most effective, safe and environmentally friendly way to disinfect wastewater. Unlike chemical approaches to water disinfection, UV light provides rapid, effective inactivation of microorganisms through a physical process.Sep 1, 2020
Which bacteria is used in aeration tank?
With a normal influent load of pollutants, the dissolved oxygen content in the aerated section of most plants should be kept between 3 and 5 MG/L. Anaerobic bacteria are normally used in an anaerobic digester to reduce the volume of sludge to be disposed of and to produce methane gas.Jun 14, 2012
What are the 7 steps in wastewater treatment?
The Wastewater Treatment ProcessStage One — Bar Screening. ... Stage Two — Screening. ... Stage Three — Primary Clarifier. ... Stage Four — Aeration. ... Stage Five — Secondary Clarifier. ... Stage Six — Chlorination (Disinfection) ... Stage Seven — Water Analysis & Testing. ... Stage Eight — Effluent Disposal.Mar 5, 2021
What are the 7 stages of water treatment?
These include: (1) Collection ; (2) Screening and Straining ; (3) Chemical Addition ; (4) Coagulation and Flocculation ; (5) Sedimentation and Clarification ; (6) Filtration ; (7) Disinfection ; (8) Storage ; (9) and finally Distribution.
What is grit removal?
Grit removal is the process used to remove sand, silt and grit from water. Grit (and sand) removal is often found in the headworks of wastewater treatment plants (WWTP).
How many types of clarifier are there?
Clarifiers Basic Principle: Bridge support, column support and traction are the three main types of clarifiers, Primary and Secondary clarifiers.
What is a secondary clarifier?
secondary clarifiers is to separate biological floc from the treated liquid waste stream. Secondary clarifiers are most often discussed in conjunction with suspended growth biological wastewater treatment systems.
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 headworks in wastewater treatment?
The " headworks " of a wastewater treatment plant is the initial stage of a complex process. This process reduces the level of pollutants in the incoming domestic and industrial wastewater to a level that will allow the treated wastewater or effluent to be discharged into a stream, river or lake. This treated effluent also may be sprayed onto dedicated land areas where it is used for the irrigation of crops and even golf courses. The complete process includes preliminary treatment, primary treatment, secondary treatment and often tertiary treatment.
What is an axial pump?
The impellers are designed to be rounded and free of sharp corners and projections that would be likely to catch and hold rags and other stringy type materials. Axial pumps, commonly used in wet well installations, move liquid by the propelling or lifting action of the impeller vanes.
Why is grit washed?
After removing the collected grit from the grit chamber, the grit normally is washed to ease handling. In most cases, a reduction in grit volume by removing the water contained in grit saves transportation costs and eases transport and handling during disposal.
What is centrifugal pump?
Centrifugal pumps are classified into radial flow, mixed flow and axial flow types, according to the direction of flow in reference to the axis of rotation. The rotation axis of the pump shaft determines whether the pump is a horizontal or vertical unit.
What is water treatment?
Water treatment facilities in smaller towns and villages, as well as treatment works supporting institutions, prisons, resorts or remote facilities, have difficult choices to make when selecting their headworks systems. All require a solids-control strategy, but lower flows and smaller budgets limit the available equipment options. The necessary equipment is called upon to effectively screen out the solids and prepare them for disposal while meeting the financial constraints of the smaller facilities.
Who is the manager of the Bridgewater Correctional Complex?
In the more than 62 years Leo DuBois has served as the manager of the wastewater treatment plant at the Bridgewater Correctional Complex in rural Massachusetts, he’s observed a curious stream of flushed debris. Dealing with the prison’s wastewater is a unique challenge, as inmates treat their toilets like trashcans. Everything from cigarette butts to jumpsuits and plastic baggies get sent down into the pumps to be weeded out at DuBois’ headworks facility.
Why is pretreatment important?
Because all wastewater debris starts at the headworks, proper screening and debris removal is imperative to the entire wastewater system. Pretreatment devices are designed to remove or reduce large solids like wood, cloth, paper and plastics, while also dealing with grit and excessive amounts of oil and grease.
What is an alternative to manually raking a screen?
An alternative to a manually raked screen is an automated coarse screen. These products typically also use vertical bars to capture solids before removing the screenings with an automated raking system. This type of screen is significantly costlier than manual screens in both capital expense and operational costs. While the automated screens do eliminate the manual raking, they do not remove other challenging operating problems.
What is an auger monster?
The middle-ground solution for a smaller facility is in-channel auger screens , such as the Auger Monster from JWC Environmental. This popular option fits into existing channels with little modification and provides the treatment plants with a fine screening solution as well as clean, dry and compacted solids — all at an attractive, reasonable cost.
What is screened material?
Screened materials are wet and laden with fecal materials that are both odorous and difficult to dispose of. A solution to this problem is compacting equipment for the screenings. This, however, is an additional piece of equipment that must be purchased, installed and maintained.
Primary Treatment – Wastewater Screens
The treatment of municipal sewage at any wastewater treatment plant all start at the same place – at the headworks screens.
Coarse Screening and Grinding
It is critical to have some level of primary treatment protection at the headworks of a treatment plant. If the plant is fed from a combined sewer system there is the possibility tires, tree branches, lumber, or other heavy objects can damage downstream treatment equipment.
Fine Headworks Screens
Fine Screening in now an essential part of a modern treatment plant’s headworks. Primary treatment fine screens are bi-directional headwords screens utilizing perforated plates or drums. JWC’s Monster Band Screen, Fine Screen Monster or Drumscreen Monster® are fine screens that typically have openings from 1- to 6-mm.
Screenings Washing and Compacting
Disposal of the solids screened out at the headworks is another challenge for treatment plant operators. A heavy duty washer compactor can receive solids from wastewater screens, separate out the soft organics, and then compact and dewater the inorganic trash. JWC’s Screenings Washer Monsters are the ideal solution for this.
