Skip to main content

Process involves in wastewater treatment

There are four  main steps that have been practiced over the year


Preliminary treatment
Primary treatment
Secondary treatment (or biological treatment)
Tertiary treatment

The above four steps are sufficient to treat the wastewater.
Preliminary treatment involves separating the floating impurities (like Wood, dead body, plastics, etc) from the wastewater

To remove these types of impurities we use large size of screens and the process is called screening.
 


After the screening process wastewater passes through the grid chamber.
Grit chambers are used to remove grit present in the wastewater like gravel, sand, broken glass, fragments of metal, and inorganic solids. It prevents damage to the pumps, and to prevents their accumulation in sludge digesters.


Primary treatment
In primary treatment, we have to remove fine small particle that is silt that couldn't extract from about process. to remove the silt particle we are going to use a sedimentation tank 
Feature of sedimentation tank
Sedimentation tank- sedimentation of solid wastes
It removes almost 60%-70% of fine particles
The colloidal and soluble organic content of wastewater is not removed in this tank
to remove the colloidal particle we have the flocculation method
know about the flocculation method click here

Secondary treatment (biological treatment)
In secondary we remove organic content and pathogens that are dissolved in the wastewater. it can be done in three ways.
Aerobic treatment 
Aerobic treatment is a biological process that uses oxygen to decompose the organic matter and remove other pollutants like nitrogen and phosphorus. It converts organic matter into carbon dioxide and new biomass. During aerobic treatment, oxygen is continuously required so forced air from an air blower or compressor is mixed with the wastewater. The aerobic bacteria feed on the waste in this water and aerobic treatment takes place.
Anaerobic treatment
​Anaerobic digestion is a process in which microorganisms convert organic matter into biogas in the absence of oxygen. It is an energy-efficient process that is typically utilized to treat high-strength industrial wastewater that is warm and contains high concentrations of biodegradable organic matter (measured as BOD, COD, and/or TSS). An anaerobic system can be used for pretreatment prior to discharging to a municipal wastewater treatment plant or before polishing in an aerobic process
facultative treatment
It is a shallow pond consisting of an aerobic zone close to the surface and a deeper, anaerobic zone. AS algae grow on the surface, they produce oxygen, which is consumed by aerobic bacteria in the middle of the pond degrading the BOD. In the lower zones of the pond, anaerobic digestion takes place.







Labels:

Comments

Post a Comment

Popular posts from this blog

Understanding Slope Stability and Types of Landslide Movement

Slopes are integral components of both natural landscapes and human-made constructions. However, slope stability can be compromised, leading to slope movements or landslides that pose significant risks to infrastructure and human lives. In this blog post, we will delve into the world of slope stability, exploring the causes of slope failures, different types of landslide movements, and the methods employed to assess and mitigate slope instability. Causes of Slope Failures: Slope failures can be attributed to various natural and human-induced factors. Natural causes include gravitational forces, water saturation, erosion, seismic activity, changes in aquifer levels, volcanic eruptions, and freeze-thaw weathering cycles. On the other hand, human-induced causes encompass activities such as toe excavations, infrastructure loads, machine vibrations, construction of weak embankments or earth dams, and deforestation, which can exacerbate slope instability. Types of Landslide Movements: Lands...
Post a Comment
Read more

Solving PLAXIS Error Code 103: Understanding and Resolving Load Advancement Procedure Failures

PLAXIS is a widely used geotechnical engineering software for analyzing soil behavior and predicting the response of structures. However, encountering errors during simulations can be frustrating. One such error is Error Code 103, which occurs when the load advancement procedure fails.  In this blog, we will delve into the causes of this error and provide practical solutions to overcome it. So, let's explore how to resolve PLAXIS Error Code 103 and successfully complete your simulations! Understanding PLAXIS Error Code 103: Error Code 103 typically occurs when PLAXIS encounters difficulties while advancing the load during the analysis. It indicates a problem with the load advancement procedure, hindering the successful completion of the simulation. Common Causes of Load Advancement Procedure Failures: a. Numerical Instability: The load advancement procedure can fail due to numerical instability caused by inappropriate model settings, such as unrealistic soil parameters or ...
Post a Comment
Read more

Understanding Dilation in Overconsolidated Clay Soils during Shearing

In geotechnical engineering, the behavior of soil under stress is a fascinating subject. One aspect that requires careful consideration is the potential for dilation in overconsolidated clay soils during shearing. In this blog post, we will explore the factors influencing dilation and shed light on its significance. So, let's dive in! Understanding Dilation in Overconsolidated Soils: Overconsolidated soils have experienced higher levels of stress in the past, resulting in a denser arrangement of soil particles compared to normally consolidated soils. When these soils undergo shearing, they tend to compress less, and in some cases, they may even dilate.   The Role of Previous Maximum Effective Stress: The key factor that determines the likelihood of dilation is the magnitude of the previous maximum effective stress experienced by the clay soil. This stress represents the maximum stress level the soil has encountered in the past.   Why Dilation Occurs: When the p...
Post a Comment
Read more