• Twitter
  • Facebook
  • LinkedIn
  • Mail
  • Call Me Back
  • About
  • Knowledge
📞 Call us on 0330 223 31 31
Water Treatment Services
  • Home
  • Water
    • Applications
      • Boiler Water Treatment
      • Cooling Water Treatment
      • Closed Loop Water Treatment
      • Legionella Control
    • Services
      • Cooling Tower Cleaning
      • Cooling Tower Maintenance
      • Chlorine Dioxide Water Treatment
      • Commercial Water Softeners
      • Expert Witness Services
      • Pre-Commission Cleaning
      • Tank Reline & Repair
      • TMV Servicing
      • Water Chlorination & Disinfection
      • Water Leak Detection
      • Water Testing
        • Drinking Water Testing
        • Metals Testing
        • Pool Water Testing
        • BSRIA Closed System Testing
        • SDI Testing & Analysis
        • Trade Effluent Testing
    • Training
      • Water Treatment Training
      • Basic Chemistry of Water
      • Industrial Treatment
      • Pre-Treatment
      • Boiler Treatment
      • Cooling Systems
      • Closed Systems
      • Wastewater Training
      • Advanced Treatments
      • Training Dates 2021
  • Wastewater
    • Metals Testing
    • Trade Effluent Testing
    • Wastewater Training
    • Expert Witness Services
  • Air
    • Ductwork Cleaning
    • Indoor Air Quality
    • Local Exhaust Ventilation Testing
    • Mould Testing
    • Expert Witness Services
  • Energy
  • Legionella
    • Legionella Risk Assessment
    • Legionella Training Courses
      • Legionella Awareness Training
      • Responsible Person Training
      • Water Hygiene Awareness
      • Pseudomonas Training
      • Training Dates 2021
    • Legionella Testing
    • Expert Witness Services
  • Contact
  • Search
  • Menu Menu
You are here: Home1 / Knowledge2 / Energy3 / How Industrial Wastewater Treatment Works
How industrial wastewater treatment works

How Industrial Wastewater Treatment Works

In this article the wastewater treatment specialists at WTS consider the benefits of treating industrial wastewater and trade effluent streams prior to discharge or re-use.

The article looks at how good wastewater treatment practices can help businesses achieve regulatory compliance and improve total environmental performance. It examines the role of pre-treatment technologies, what they involve, and how they work with a review of the most common chemical and filtration methods currently used in industry.

Why is the treatment of industrial wastewater important?

Industrial wastewater is created during many different business activities, and in some cases, the used water can be discharged straight into the local drainage system if it is clean enough, or reused in the same operation. In most cases though, the contaminated water will not be clean enough for immediate reuse or discharge, and will need to go through some other treatment process to make it suitable to put into the local sewers. This process is commonly known as wastewater treatment (or pre-treatment) and is often essential to ensure environmental compliance standards are met.

If as a business you are not cleaning up your wastewater to a sufficient standard before disposing of it into the local sewer system, then you are risking damaging the local environment, heavy fines, and perhaps even legal action. It’s certainly not a topic which can be ignored.

What does the treatment of industrial wastewater involve?

The first stage of any industrial wastewater treatment process involves the chemical analysis of the contaminated water, and a study of the circumstances under which it would be discharged into the drains. The aim of the pre-treatment process is to remove metals, other suspended materials, dissolved solids and chemicals from the water. There are various ways of doing this, but the main pre-treatment methods usually involve a mix of both filtration, and the use of special water treatment chemicals.

  • Learn more about the analysis of wastewater

Using chemicals in the treatment of wastewaters

The starting point once you have your chemical analysis of your wastewater is to review the minimum standards required as part of your trade effluent discharge consent or licence, and then work out what you need to do to bring the wastewater (trade effluent) up to that standard.

  • Learn more about trade effluent

You’ll often find that many of the particulates created in industrial processes are far too small to be removed by even the finest filters, so you will need a chemical treatment to do some of the initial work. Water treatment chemicals can help you remove ions and other unwanted solids from the wastewater. The three main chemical groups commonly used for the treatment of industrial wastewaters are:

  • Coagulants
  • Flocculants
  • pH Adjusters

One of the first steps in the treatment process is usually to adjust the pH of the wastewater. Raising the pH will help to bring any metal contaminants out of solution, before adding in a specially selected chemical called a coagulant. The role of the coagulant is to get the solid particles contaminating the wastewater to form into small clumps so they can be removed more easily. Once these small clumps or flocs have formed a special chemical called a flocculant can be added to the wastewater to encourage the solids to settle out, or to float, for easy removal.

Using pH adjusters

A pH adjusting chemical works by manipulating the pH level of the water. The chemical reaction that takes place will help to increase the number of negatively charged hydroxide ions, which will in turn cause the positively charged metal ions to bond with them. This reaction creates solid particles of the metals which can then be filtered out more easily.

Using wastewater coagulants

In treatment systems where solids suspended in water are an issue, a coagulant can be used to bring all the solids together, making them much easier to remove. Wastewater coagulant can be either organic or inorganic.

The most common inorganic coagulants tend to be based on aluminium or iron and are often more cost effective, they are ideal for use in water with low turbidity. Inorganic coagulants work to form either iron or aluminium precipitates which then absorb any impurities in the water. The problem with this is that inorganic coagulants can increase the amount of sludge created, which then needs to be removed from the treated water. Organic coagulants on the other hand are used in smaller quantities, and also produce less sludge.

Using flocculants to treat industrial wastewater

The job of a flocculant chemical is to make it easier to remove suspended solids in water by encouraging them to clump together into flakes, which are also known as flocs. These flakes then either sink to the bottom of the tank, or float on the top. Flocculants and coagulants are commonly used together, but can also be used separately.

Wastewater treatment using filtration technologies

Once the wastewater has been chemically treated, the next step is to run the water through a filter system to get rid of the larger particles causing the contamination in the water. Some treatment processes incorporate a filtration system immediately following on from chemical treatment, whereas others incorporate a settlement tank for additional clarification or to allow solids to be floated off.

There are lots of options for filtering out waste contamination, but the main technologies used are centrifuges, filter presses, and belt presses. Each method has its own advantages and disadvantages.

Centrifuges

Using a centrifuge to literally “spin” contaminants out of industrial wastewater has been a technique used for a long time. This method uses a fast-spinning cylinder to remove the solids from a liquid.

Once the liquid has been removed from your waste, you are left with a thick sludge which is easier to store in tanks, or to further process and separate out for reprocessing. However, centrifuges use a lot of energy while operating, and can be very expensive to set up initially, which often makes them prohibitively expensive.         

Belt presses

Belt filter presses have been around since the 1970s and are used as a way of removing excess water from sludge to make it easier to treat. They work through a combination of drainage through gravity, and pressure, applied mechanically.

Usually, the wastewater to be treated first flows into a gravity drainage system, allowing water to flow away and the slurry to thicken up. Then pressure is gradually applied, using a system of belts and rollers to squeeze even more water out of the slurry.

The slurry will first flow through several sets of rollers, with each set having a smaller diameter. The forces exerted by the squeezing and shearing pressures help to remove excess water until the solids become even more concentrated.

Most belt presses will only work after coagulant or flocculant chemicals have been added into the wastewater treatment system, and they can be time-consuming to maintain and keep running. However, a belt press can be kept running constantly, rather than treating the water in batches.

Filter presses

Filter presses use pumps to create pressure which forces solids out of the wastewater. A typical system will involve sludge being forced at high-pressure through a succession of filters until all of the contaminants have been separated out from the water.

This technology has been around the longest and at the end of the process the solids are formed in to what are called “cakes” that can be easily removed.

The filters are most commonly made from plastic, with a hole in the middle. Joining the plates together provides a chamber for the wastewater, which is then forced out through a fine filter to catch the particulates. Modern filter presses are usually fully automated, and don’t require the addition of extra chemicals. Although low-tech, this is one of the most reliable filtration methods used for the treatment of industrial wastewaters.

Expert industrial wastewater and trade effluent solutions

Water Treatment Services offer a comprehensive range of industrial wastewater and effluent management solutions.

Find out how our experts can help reduce your costs, achieve regulatory compliance and improve environmental performance.

We can provide advice and full support to help you identify the most appropriate strategies for managing your liquid waste and effluent streams.

With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, wastewater specialists and technicians we offer cost effective environmental support solutions across the whole of the UK and Ireland.

Contact us today to learn how our specialist wastewater management solutions can help improve your environmental performance, reduce costs and achieve cost effective discharge consent standards.

Contact Us Today

Further reading…

Learn more about our industrial wastewater treatment solutions.

 

Tags: Industrial wastewater treatment, Wastewater treatment, Water testing
You might also like
Controlling legionella in hospitals and healthcare premises Controlling Legionella in Hospitals & Healthcare Premises
How are business water bills and sewerage charges calculated? How are Business Water Bills & Sewerage Charges Calculated?
Private water supply problems Private Water Supply Problems & What to Do
What is water borehole drilling? What is Water Borehole Drilling?
What is Fracking for Shale Gas? What is Fracking? Hydraulic Fracturing for Shale Gas & Oil
Concrete mixing water testing Testing Concrete Mixing Water Quality
What is Silver Hydrogen Peroxide? What is Silver Stabilised Hydrogen Peroxide?
Testing aerobic colony counts in water Testing Total Aerobic Colony Counts in Water

Search…

What’s New

  • How Boiler Water Treatment Affects Performance

    How Boiler Water Treatment Affects Performance

    In this article the industrial steam boiler specialists at …
  • Improving HVAC Energy Efficiency

    Improving HVAC Energy Efficiency

    This article examines how businesses can optimise energy consumption, …
  • What is Waste Acceptance Criteria or WAC Testing?

    What is Waste Acceptance Criteria or WAC Testing?

    In this article the industrial waste specialists at WTS …
  • How to Prevent Mould Growth in the Workplace

    How to Prevent Mould Growth in the Workplace

    In this workplace safety review the environmental hygiene specialists …
  • How Expert Reports Help Resolve Disputes

    How Expert Reports Help Resolve Disputes

    Water Treatment Services experienced expert witnesses provide independent, impartial …
  • Mining Wastewater Treatment & Water Reuse

    Mining Wastewater Treatment & Water Reuse

    In this article the industrial water treatment specialists at …

REVIEWS

4.8
Rated 4.8 out of 5
Water Treatment Services is rated 4.8 out of 5 stars (based on 97 reviews)
Read our reviews

Free Newsletter

Receive exciting features, news, latest research and special offers! Just add your email address and we'll do the rest.

Contact us

Water Treatment Services

[email protected]

Tel: 0330 223 31 31

© Copyright 2022 - EDG Ltd. Operating as Water Treatment Services
  • Twitter
  • Facebook
  • LinkedIn
  • Mail
  • Home
  • About
  • Careers
  • Privacy
  • Environment
  • Reviews
  • Sitemap
Mining Wastewater Treatment & Water Reuse Mining wastewater treatment How Expert Reports Resolve Disputes How Expert Reports Help Resolve Disputes
Scroll to top

This site uses cookies. By continuing to browse the site, you are agreeing to our use of cookies.

OK

Cookie and Privacy Settings



How we use cookies

We may request cookies to be set on your device. We use cookies to let us know when you visit our websites, how you interact with us, to enrich your user experience, and to customize your relationship with our website.

Click on the different category headings to find out more. You can also change some of your preferences. Note that blocking some types of cookies may impact your experience on our websites and the services we are able to offer.

Essential Website Cookies

These cookies are strictly necessary to provide you with services available through our website and to use some of its features.

Because these cookies are strictly necessary to deliver the website, refuseing them will have impact how our site functions. You always can block or delete cookies by changing your browser settings and force blocking all cookies on this website. But this will always prompt you to accept/refuse cookies when revisiting our site.

We fully respect if you want to refuse cookies but to avoid asking you again and again kindly allow us to store a cookie for that. You are free to opt out any time or opt in for other cookies to get a better experience. If you refuse cookies we will remove all set cookies in our domain.

We provide you with a list of stored cookies on your computer in our domain so you can check what we stored. Due to security reasons we are not able to show or modify cookies from other domains. You can check these in your browser security settings.

Google Analytics Cookies

These cookies collect information that is used either in aggregate form to help us understand how our website is being used or how effective our marketing campaigns are, or to help us customize our website and application for you in order to enhance your experience.

If you do not want that we track your visit to our site you can disable tracking in your browser here:

Other external services

We also use different external services like Google Webfonts, Google Maps, and external Video providers. Since these providers may collect personal data like your IP address we allow you to block them here. Please be aware that this might heavily reduce the functionality and appearance of our site. Changes will take effect once you reload the page.

Google Webfont Settings:

Google Map Settings:

Google reCaptcha Settings:

Vimeo and Youtube video embeds:

Other cookies

The following cookies are also needed - You can choose if you want to allow them:

Privacy Policy

You can read about our cookies and privacy settings in detail on our Privacy Policy Page.

Privacy
Accept settingsHide notification only