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Sewerage Treatment –

Package Plant Design & Management

While maintenance is crucial, we believe that both DESIGN and PROPER MANAGEMENT are key elements in ensuring a successful treatment plant.

What we offer

Design

In our experience, certain critical processes are almost always overlooked when designing package plants. Our team has many years of hands on relevant experience and additionally utilizes Biowin modeling software in order to verify the final results.

Existing Plant

  • professional assessment
  • detailed engineers report with recommendations

New Plant

Design according to specific site needs and conditions, with the assistance of several professionals we are able to carefully assess and design a plant that will answer the clients specific need.

Build

Existing Plant

Based on the advice and recommendations of the professional team we are capable of re-configuring and altering your existing plant if needed to ensure optimal performance

New Plant

We offer turnkey solutions together with the professional team and our construction partners.

Manage & Maintain

We offer comprehensive plant maintenance and management programs with the following key focus points

Manage

  • Daily plant operations including,
  • cleaning of screens,
  • disposal of screenings,
  • Check and refill disinfection chemicals as and when needed
  • Check and monitor all equipment
  • Service equipment in accordance with a service/maintenance schedule
  • Monitor Bacterial dosing and replace when needed

Enviro-Lab

Design Philosophy

Biological Nutrient Removal (BNR) processes can be both effective and economical. Proper mixing within anoxic and anaerobic zones can help ensure lower effluent nutrients and improved treatment efficiency.

Nutrients such as nitrogen and phosphorus are the primary cause of eutrophication in surface waters resulting in algal blooms, low dissolved oxygen, and fish kills. Efforts to reduce nutrient impairment have brought about more stringent effluent limits for wastewater treatment plants, often necessitating BNR systems to ensure compliance.

BNR is carried out through the use of microorganism selection and controlled environmental conditions within the treatment plant, characterized by the arrangement of unaerated (anoxic/anaerobic) zones upstream and/or downstream of aeration zones. Mixed liquor recycle and sludge return streams are arranged to make best use of the organic content and activated sludge in the system. With these processes in place, eutrophication is avoided in the recipient water system.

Below are characteristics of the different zone types:

Anaerobic Zone.
In this zone no readily-utilized forms of oxygen (such as free oxygen, dissolved oxygen, and nitrites/nitrates) are present.

Anoxic Zone.
In this zone no dissolved oxygen is present, but “chemically bound” oxygen, including nitrites and nitrates which microbes use for metabolic processes, is typically present.

It follows that avoiding significant oxygen transfer when mixing in anoxic and anaerobic zones is a critical requirement.

The removal of nitrogen and phosphorous require different approaches, as below:

For total nitrogen removal,
the process must have an aerobic zone for nitrification and an anoxic zone for denitrification with nitrate-rich mixed liquor return.  A different arrangement of aerobic and anoxic zones is used in the so-called step-feed process.

For total phosphorus removal,
particulate phosphorus is removed through solids removal, and soluble phosphorus is removed by microbial uptake through phosphorus-accumulating organisms. The process must have an anaerobic zone free of dissolved oxygen and nitrate for phosphorus release and microbe selection, and an aerobic zone for phosphorus uptake.

While aeration (and the mixing that comes with it) accounts for the majority of energy consumption in most wastewater treatment processes, securing adequate conditions in anoxic and anaerobic zones also requires energy for pumping into and out of these zones and mixing within them.  Pumping for BNR applications basically entails finding a reliable technology for transporting relatively large flows at low head for a set of well-defined duty points.

Free delivery on all orders over R1500!