Waste Water

Magnus is well known for its effective water treatment solutions. The company also helps its customers, who are often faced with complex environmental challenges, by providing specialized products and services.

We have the expertise to guide you through the waste water treatment process as well as the knowledge to help you minimize your impact on the environment by removing contaminants from effluent streams. We deliver results by:  

  • Listening to your needs and challenges;
  • Evaluating your facilities to better understand the current situation;
  • Assessing the effluent contaminants (nature and concentration);
  • Benchmarking treatment technologies for cost-effectiveness;
  • Conducting pilot studies and on-site trials;
  • Reporting findings and recommendations, including feed and control improvements as well as source minimization whenever possible.

When designing a program, we take the physical and chemical parameters identified during the survey into consideration as well as any specific end-user requirements. The objective is to bridge the gap between influent and effluent water quality.

Oil and Grease

Sources of oil & grease found in wastewater streams are varied: food and beverage processing, industrial manufacturing, metal preparation and metal working, lubricants, cleanings, etc… Although gravity pits and traps are used, oil and grease contaminants are often found as an emulsion in water, therefore requiring a chemical treatment to break the emulsified oils. There are several methods to remove oil & grease, depending on the type and concentration:

  • Hydrocarbons C10-C50 = Absorption on specialty polymers

  • Vegetable / animal oils and fats = coagulation & flocculation followed by flotation.

  • Cutting oils = ceramic membranes.



Water-based paints (latex) can be found in wastewater streams when a given manufacturing plant applies paint as part of their production and cleaning process. Pigments and dispersants present in paint formulations add to the challenge for treating this type of wastewater.

Magnus has developed a very efficient treatment method using coagulation and flocculation; the effluent is often so clean that it can be reused in the process.

We custom-build integrated treatment systems that are specifically designed for paint containing wastewater streams.


Chemical contaminants

COD / BOD (Chemcial Oxygen Demand / Biological Oxygen Demand)

COD and BOD are general indicators of pollution in water.

They can be reduced though coagulation and flocculation when associated to suspended solids. When the DCO and BOD are of a soluble type, they require biological treatment.

Total Suspended Solids (TSS)

Liquid-solid separation, either by gravity settling or flotation, works well for removing suspended solids. Processes involving coagulation and flocculation speed up the reaction rates and improve treatment of suspended solids.

Phosphorus / Phosphate

This chemical element is at the center of many environmental discussions right now, because it promotes the growth of algae in natural waters. Most of it comes from detergents, metal preparation chemicals and fertilizers. 

Precipitation via coagulation and flocculation is very efficient at removing phosphates, as part of a settling or flotation process.  Phosphorus can also be removed by biological digestion.


Heavy Metals

Heavy metals that are dissolved in wastewater effluents are problematic for municipal treatment facilities, because of the added toxicity towards the biological population working at decomposing organic matter.

Heavy metals generally originate from industrial manufacturing processes, and can widely vary in nature and levels; the list of heavy metals is long:

Al, Sb, Ag, As, Be, B, Cd, Cr, Cu, Sn, Fe, Mn, Ni, Pb, Se, Th, Zn, Zr

The removal or reduction methods for heavy metals found in wastewater streams are:

  • Coagulation and flocculation process, including a liquid-solid separation system.

  • Controlled precipitation, using ph and/or specialized polymer chemistry that will target specific metals.

  • Ion exchange resins, designed for specific metals.



Waste water pH is a general control parameter in most treatment facilities. It is a well-known process, that may look quite simple at first as we typically add an acid or caustic agent to decrease or increase pH until a given set-point is met. The challenge for controlling pH comes from varying process conditions, demanding a design that can compensate for such swings.

Magnus designs and builds neutralization systems that are suited for a specific application; to our standard SNC product line we add the ability to custom build upon request.


Sludge Dewatering

Any liquid-solid separation process will produce a given volume of sludge that must be managed: from capture to segregation, dewatering and disposal. A dewatering process aims at lowering the moisture content of the sludge collected, helping in reducing the handling and disposal costs.

Many methods and equipment are available for sludge dewatering; the most popular include filter-press, belt-press and centrifuge. They require significant investments and labour for operation. Other methods use simpler technologies, including gravity filters and containers. Magnus can help in selecting the appropriate method to suit your application.

Specialized polymers can have a significant impact on the dewatering capacity of sludge; they allow for more moisture to be extracted from the solids, with a net gain in disposal and/or incineration fees.


Coagulation and flocculation

Coagulation means breaking up the stability of charges present in a given wastewater stream, forming what is called a pin-floc, a tiny particulate barely visible to the eye. Flocculation is the creation of bridging links between pin-flocs obtained by the previous coagulation step, resulting in larger particulates that can settle or float faster and more efficiently Both steps are pH sensitive, therefore care should be taken to match the optimal ph conditions in a given treatment process. Magnus offers a complete line of specialized treatment polymers, under the POLYMAG® product line:

  • Acids and alkaline agents for pH control
  • Inorganic coagulants
  • Organic coagulants
  • Custom-blended coagulants
  • Anionic, cationic and non-inonic polymers, in the form of powder, liquid or emulsion

Hydrocarbon absorption polymer

Magnus has developed a treatment method to remove hydrocarbon-based oils (C10-C50), using a highly specialized filter media that works by absorption on a stable, inert solid polymer. It has the ability to capture from 1 to 3 times its weight, and does not leach out any oil once satured. This technology is ideal for removing oils present in wastewater that originate from motor oil, heating oil, kerosene and most other fuels. Applications are growing and not limited to :

  • Pre-treatment of clarifier or DAF systems.
  • Industrial process, cutting and metal working fluids.
  • Engine cleaning and repairs.
  • Gray-water purification for re-use.