Sewage and Wastewater Treatment

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Qatarat Water for Trading Co.

Jeddah, Saudi Arabia

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Description
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Sewage is the wastewater generated from residential, institutional, commercial, and industrial establishments.
STP plant treats the sewage to make it fit for safe disposal, agricultural use, or domestic use in toilets etc.
Sewage usually contains a high quantity of organic and inorganic wastes. It is essential to treat sewage before it enters any water body. If sewage is allowed to enter the water sources without treatment, it will contaminate them, which is why it is essential to treat sewage properly before letting it into rivers or
any other sources of water.
The principle of a Sewage Treatment Plant (STP) involves the treatment of wastewater through a series of physical, biological, and chemical processes to remove pollutants and contaminants.
The primary principle is to mimic and enhance natural processes that occur in the environment to purify water. This is achieved by promoting the growth of beneficial
microorganisms that break down organic matter, settling out solids, and disinfecting the water to ensure it meets quality standards before being discharged or reused.
Our technologies are based on the wastewater characteristics and the client’s requirements using a wide and diverse range of biological treatment systems Aerobic or Anaerobic, Suspended or Attached growth such as:

MBR – Membrane Bio-Reactor.
MBBR – Moving Bed Biofilm Reactor
SBR – Sequencing Batch Reactor.
Ex-tended Aeration systems
RBC - Rotating Bio-Contactors\

How does a sewage treatment plant work?

STP runs wastewater through multiple treatment stages. After preliminary filtration, there are three main stages of wastewater treatment (primary, secondary, and tertiary), with the third stage reserved for polishing.

Sewage Treatment Plant process

Preliminary Treatment:

Screening: Large solid objects like sticks, rags, and plastics are removed using screens.
Grit Removal: Smaller heavy particles like sand and gravel are settled out to prevent damage to downstream equipment.
Sedimentation Treatment: Wastewater is allowed to sit in a tank, allowing heavier solids to settle at the bottom as sludge while lighter substances float to the top as scum.

Secondary Treatment:

Aeration and Biological Treatment: Beneficial microorganisms (activated sludge) are introduced to break down organic matter in the wastewater. Aeration provides the necessary oxygen for microbial activity.
Aerobic vs. Anaerobic Treatment: Some STPs use aerobic treatment, where oxygen is supplied to the microorganisms, while others use anaerobic treatment, which occurs in the absence of oxygen.

Tertiary Treatment:

Filtration: Additional solids and fine particles are removed by passing the wastewater through sand, gravel, or other filtration media.
Disinfection: Chemicals like chlorine or ultraviolet (UV) light are used to kill remaining pathogens and harmful microorganisms in the treated water. Additional solids and fine particles are removed by passing the wastewater through sand, gravel, or other filtration media.