Processes

Our expertise in terms of wastewater treatment enables SES to offer an extensive portfolio of proven technologies. A brief overview of our process solutions include:

 

ASP (ACTIVATED SLUDGE PROCESSES)

ASP’s encompass a variety of mechanisms and processes that use dissolved oxygen to promote the
  growth of biological floc which substantially removes organic material. The process essentially traps or retains particulate material utilising primary, secondary and tertiary treatment stages.

 

ASP’s encompass a variety of mechanisms and processes that use dissolved oxygen to promote the growth of biological floc which substantially removes organic material. The process essentially traps or retains particulate material utilising primary, secondary and tertiary treatment stages.

In all activated sludge plants, once the sewage (or industrial wastewater) has received sufficient treatment, excess mixed liquor is released into settling tanks and the treated supernatant is discharged to undergo further processing.

Part of the settled material, the sludge, is returned to the head of the aeration system to re-seed the new sewage (or industrial wastewater) entering the tank. Excess sludge which eventually accumulates is also removed from the treatment process.

(Wastewater Treatment Process Diagram)

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MBR (MEMBRANE BIO REACTOR)

MBR combines activated sludge treatment with a membrane liquid-solid separation process.

The separation interface utilises low pressure microfiltration or ultra filtration membranes, eliminating the need for clarification and tertiary filtration.

One of the key benefits of the MBR system is that it effectively overcomes the limitations associated with poor settling of sludge in conventional processes. The technology permits bioreactor operation with considerably higher mixed liquor suspended solids (MLSS) concentration than conventional systems, which are limited by sludge settling.

The elevated biomass concentration within the process allows for effective removal of both soluble and particulate biodegradable materials at higher loading rates. This achieves considerably longer Sludge Retention Times (SRT’s) therefore requiring minimal footprint, whilst ensuring complete nitrification.

(MBR Process Diagram)

Raw Sewage Hampshire

 

RBC (ROTATING BIOLOGICAL CONTACTOR)

RBC’s are mechanical secondary treatment systems, which are extremely robust and capable of
  withstanding surges in organic load. The rotating discs support the growth of bacteria and micro-organisms present in the wastewater, which break down and stabilise organic pollutants. Oxygen is obtained from the atmosphere as the discs rotate.

As the micro-organisms grow, they build up on the media until they are removed due to the shear force of the rotating discs in the sewage. Effluent from the RBC is then passed through final clarifiers where the micro-organisms in suspension, settle as sludge. The sludge is withdrawn from the clarifier for further treatment.


SBR (SEQUENCING BATCH REACTOR)

SBR’s consist of at least two identically equipped process units with a common inlet, which can be
  alternated. The units have a “flow through” system. While one unit is in settle/decant mode the other is aerating and filling.
There are four stages to treatment; fill, aeration, settling and decanting.


The aeration stage involves adding air to the mixed solids and liquid. During this period the inlet valve to the tank is open and a return activated sludge pump takes mixed liquid and solids (mixed liquor) from the outlet end of the tank to the inlet. The incoming sewage is effectively implanted with live bacteria.

The sludge formed by the bacteria is then allowed to settle to the bottom of the tank. The aerobic bacteria continue to multiply until the dissolved oxygen is all but consumed. Conditions in the tank, especially near the bottom are now more suitable for the anaerobic bacteria to flourish. Many of these use nitrogen as a base element and extract it from the compounds in the liquid, using up the nitrogen compounds created in the aeration stage thereby enabling nitrification.

(SBR System Diagram)

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 Raw Sewage Hampshire

 Raw Sewage Hampshire