Waste Water Recycling

Waste Water Treatment & Recycling

Safeguarding natural resources (like rivers, lakes, and more) is an important part of wastewater treatment solutions. Whether Industrial Waste Water or Sewage Treatment, as your business partner, Aquatic Solutions helps customers meet ever increasing environmental, regulatory, and financial pressures.

Some Physical, Chemical and Biological Wastewater Treatment Methods

Physical Chemical Biological
Sedimentation (Clarification) Chlorination Aerobic
Screening Ozonation Activated Sludge
Aeration Neutralization Treatment Methods
Filtration Coagulation Trickling Filtration
Flotation Adsorption Oxidation Ponds
Skimming Ion Exchange Lagoons
Degasification Aerobic Digestion
Equalization Anaerobic
Ultra-Violet Anaerobic Digestion
Septic Tanks

The purpose of wastewater treatment is generally to remove from the wastewater enough solids to permit the remainder to be discharged to receiving water without interfering with its best or proper use. The solids which are removed are primarily organic but may also include inorganic solids. Treatment must also be provided for the solids and liquids which are removed as sludge. Finally, treatment to control odors, to retard biological activity, or destroy pathogenic organisms may also be needed.

While the devices used in wastewater treatment are numerous and will probably combine physical, chemical and biological methods, they may all be generally grouped under six methods:

  • Preliminary Treatment
  • Primary Treatment
  • Secondary Treatment
  • Disinfection
  • Sludge Treatment
  • Tertiary Treatment

Degrees of treatment are sometimes indicated by use of the terms primary, secondary and tertiary treatment. Tertiary treatment, properly, would be any treatment added onto or following secondary treatment.

Preliminary Treatment

At most plants preliminary treatment is used to protect pumping equipment and facilitate subsequent treatment processes. Preliminary devices are designed to remove or cut up the larger suspended and floating solids, to remove the heavy inorganic solids, and to remove excessive amounts of oils or greases.

To effect the objectives of preliminary treatment, the following devices are commonly used:

  • Screens -- rack, bar or fine
  • Comminuting devices -- grinders, cutters, shredders
  • Grit chambers
  • Pre-aeration tanks

In addition to the above, chlorination may be used in preliminary treatment. Since chlorination may be used at all stages in treatment, it is considered to be a method by itself. Preliminary treatment devices require careful design and operation.

Primary Treatment

Variations in design, operation, and application, settling tanks can be divided into four general groups:

  • Septic tanks
  • Two story tanks -- In-house and several proprietary or patented units
  • Plain sedimentation tank with mechanical sludge removal
  • Upward flow clarifiers with mechanical sludge removal

When chemicals are used, other auxiliary units are employed. These are:

  • Chemical feed units
  • Mixing devices
  • Flocculators

Secondary Treatment

In secondary treatment may be divided into four groups:

  • Trickling filters with secondary settling tanks
  • Activated sludge and modifications with final settling tanks
  • Intermittent sand filters
  • Stabilization ponds

Sludge Treatment

This is accomplished by a combination of two or more of the following methods:

  • Thickening
  • Digestion with or without heat
  • Drying on sand bed -- open or covered
  • Conditioning with chemicals
  • Elutriation
  • Vacuum filtration
  • Heat drying
  • Incineration
  • Wet oxidation
  • Centrifuging

Though specific limitations have not been established, individual package units have, in general, been small installations serving a limited population.

Package units have been adapted to practically all the treatment devices, either singly or in various combinations that have been mentioned.

Tertiary and Advanced Wastewater Treatment

Tertiary treatment has been used to describe processes which remove plant nutrients, primarily nitrogen and phosphorous, from wastewater.

Improvement and upgrading of wastewater treatment units as well as the need to minimize environmental effects has led to the increased use of tertiary treatment.

A term that is also sometimes used to indicate treatment of a wastewater by methods other than primary or biological (secondary) treatment is advanced treatment. This degree of treatment is usually achieved by chemical (for example coagulation) methods as well as physical methods (flocculation, settling and activated carbon adsorption) to produce a high quality effluent water.

What this means for you

  • Leverage a complete set of solutions (chemical, equipment, and services) from one provider
  • Contribute to a sustainable water supply that reduces discharge by increasing reuse opportunities
  • Reduce energy consumption and footprint with innovative solutions
  • Treat and clean severely impaired water
  • Improves uptime while reducing maintenance time and costs
  • Zero Liquid Discharge by Evaporation

Reduce, Recycle, Reuse

Download Brochure