Waste Water Treatment process and Filtration System

Wastewater Treatment
System

Waste water treatment

The ultimate objective of a wastewater treatment system is to supply effective treatment methods that puriﬁes water and returns the recycled water back into the ecosystem safely. However, the amount of energy it takes for a wastewater treatment system to accomplish this task is herculean. To put things into more perspective, industrial plants are compelled to follow effluent regulations, which brings a general set of issues to the production of wastewater treatment systems, which include:

Wastewater Treatment Removes The Following Issues:

Elevated discharge volume
Elevated BOD levels
Elevated TDS or TSS levels
Elevated phosphate or nitrate levels
Harmful substances in waste stream
Dynamic compliance procedures

MEMBRANE BIOREACTOR TECHNOLOGY

Membrane bioreactor (MBR) technology is an integration of biological treatment and membrane ﬁltration into a single process, in which microorganisms are responsible for organic and nitrogen removal, while membranes capture biomass and suspended solids physically from the mixed liquor. The MBR process utilizes microﬁltration cartridges (MF) or ultraﬁltration (UF) technology ranging from 0.05 to 0.4 µm to enable complete retention of bacterial ﬂocs and suspended solids. MF membranes are responsible for removing suspended solids, algae, protozoa, and bacteria, while UF membranes an additionally retain small colloids and viruses.

The conﬁguration of membrane plays a crucial role in determining the process performance. There are mainly three types of membrane conﬁgurations that are being used in MBR technologies: 1) plate-and-frame/ﬂat sheet (FS), 2) hollow ﬁber (HF), and 3) multi tubular (MT). In FS membranes, the ﬂuid ﬂows from the membrane’s coated side towards the permeate side. In MT module, ﬂuid ﬂows from inside towards outside the tube (lumen to shell-side), whereas in HF conﬁguration ﬂuid ﬂows from outside towards inside (shell to lumen-side).

Main Stages Of The Wastewater Treatment Process

Preliminary treatment

Preliminary treatment removes the larger solids from the wastewater stream through a screening process.

Primary Treatment

Once the larger solids are removed, the wastewater is allowed to settle.The settled sludge and risen scum are pumped to other areas of the plant for further treatment.

Treatment

The wastewater is allowed to settle. The settled sludge and risen scum are pumped to other areas of the plant for further treatment.

Secondary Treatment

In secondary treatment, the wastewater is pumped into tanks containing bacteria that break down waste products into less harmful substances. Once this process is complete, remaining solids are removed.
In further digestion process, sludge breaks down into inert biosolids which are pumped to holding lagoons. Produced methane gas is burned in boilers to heat the digestion process. Yearly, the biosolids are spread on farmland as organic fertilizer.

Tertiary Treatment

The City of Red Deer is installing an ultraviolet disinfection process at the Wastewater Treatment Plant to deactivate microorganisms which remain after secondary treatment.

Equalization Lagoons

Midwater's equalization lagoons provide a holding place for wastewater during high flows and power outages.

How Does A Wastewater Treatment Plant Work?

In general, wastewater treatment plants are built to treat waste water and cleanse sludge so that each could be returned to the environment. As these plants eliminate suspended solids, contaminants, and organic material from puriﬁed water, the oxygen composition is restored. These results are attained through four divisions of treatments named preliminary, primary, secondary and sludge.

Pre-treatment Screening

The pretreatment phase involves ﬁltering large waste materials from the water. The rate of water inﬂow is also monitored in order to separate organic materials such as sand, glass, and stone.

Wastewater Aeration

Primary Treatment

Post Treatment

MIDWATER Wastewater Treatment Plant

In nature, bacteria feed on organic waste and break the main stages of the wastewater treatment process it down into less harmful substances. In Midwater, sewage, or wastewater, goes to the Wastewater Treatment Plant (WWTP). At the plant, natural biological processes are accelerated and combined with physical and chemical treatment processes to remove undesirable solids and microorganisms before the water is recycled back into the Midwater.
Midwater’s WWTP is regulated through approval from Alberta Environment. Samples are taken as wastewater enters and leaves the WWTP. An on-site laboratory then analyzes the samples to determine the plant’s eﬃciency and make sure The City is meeting government regulations. This ensures strict environmental guidelines are met.

How does a wastewater treatment plant work?

In general, wastewater treatment plants are built to treat waste water and cleanse sludge so that each could be returned to the environment. As these plants eliminate suspended solids, contaminants, and organic material from purified water, the oxygen composition is restored. These results are attained through four divisions of treatments named preliminary, primary, secondary and sludge.

Pretreatment Screening

The pretreatment phase involves filtering large waste materials from the water. The rate of water inflow is also monitored in order to separate organic materials such as sand, glass, and stone.

Wastewater Aeration

After pretreatment, the process of aeration is used to supply oxygen to bacteria for purifying and preserving the wastewater. This development allows for biodegradation, which dissolves the organic substances that contain carbon into smaller compounds to form CO2 and water.

Primary Treatment

Primary treatment consists of the usage of equipment to break down large contaminants. Afterwards, extracting these contaminants is undertaken through the use of sedimentation. Secondary treatment is usually used alongside the primary method for the purposes of further removing organic matter

Post Treatment

Chlorination dosing and UV purification systems are widely used methods to remove harmful microorganisms in water. Chlorine has gained its popularity due to its effectiveness in eradicating disease-causing bacteria.

Wastewater Treatment
System