Wastewater Treatment System | What It Is and How It Works?

1. Introduction

When it comes to wastewater treatment, there’s no one-size-fits-all solution. Every facility has different needs and goals when it comes to treating its wastewater in an effective and safe manner. Because of this, selecting the right system for your specific requirements is essential to ensuring water quality standards are met while reducing operational costs.

To guide you through this important decision-making process, we’ve put together an informative post outlining everything you need to know before purchasing a new wastewater treatment system.

Figure 1 Wastewater treatment system.

2. What is Wastewater Treatment?

In our wastewater treatment process, the whole process is usually divided into primary, secondary, and tertiary treatment processes. The following is our introduction to the entire process:

1. According to the processing method:

1) Physical methods: grid filtration, sedimentation, flotation, centrifugal separation, membrane separation, etc.
2) Chemical methods: coagulation, chemical precipitation, neutralization, extraction, redox, electrolysis, etc.
3) Biological methods: aerobic and anaerobic methods

2. According to the degree of processing and processing tasks:

1) Primary treatment: mechanical treatment
2) Secondary treatment: the main process is biochemical treatment
3) Tertiary treatment: control of eutrophication and reuse

Wastewater Treatment Process:

Typical process flow diagram of a wastewater treatment plant (WWTP). | Download Scientific Diagram

3. What is Onsite Wastewater Treatment System?

On-site wastewater systems contrast with traditional water treatment in that after wastewater is treated, it is not discharged into the soil or collected and transported to a wastewater treatment plant. The system collects, treats, and disperses wastewater generated by communities or industries and enterprises and performs multi-stage treatment.

-On site wastewater treatment system cost

System type Average installed cost
Aerobic Treatment Unit (ATU) $10,000 – $20,000
Mound Septic System $10,000 – $20,000
Recirculating Sand Filter System $7,000 – $15,000

-On site sewage disposal systems examples

Residential Onsite Wastewater Treatment Systems benefits

4. Factors to Consider When Selecting a Wastewater Treatment System.

There are several key factors you should consider when purchasing a wastewater treatment system for your facility to ensure that you are getting the most suitable water treatment system to solve your problems. Here are some key things you need to keep in mind:

1). The Size of Your Facility.

First, the size of your facility is one of the most important factors you will consider. A system that is too small will not be able to handle the volume of wastewater that your facility produces, while a system that is too large will be unnecessarily expensive and may not be the most efficient option. Be sure to measure your facility carefully and consult with a wastewater treatment specialist to determine the appropriate size of the system for your needs.

2). The Type of Wastewater You Produce.

Different types of wastewater require different treatment systems. For example, industrial wastewater may require a different system than domestic wastewater. Be sure to identify the type of wastewater that your facility produces, and choose a system that is specifically designed to treat that type of wastewater.

3). The Level of Treatment Required.

The level of treatment required for your wastewater will depend on a variety of factors, including local regulations and the intended use of the treated water. For example, if the treated water will be used for irrigation or other non-potable purposes, a lower level of treatment may be sufficient. On the other hand, if the treated water will be used for drinking or other purposes that require a high level of purity, you will need a system that is capable of providing a higher level of treatment.

4). The Cost of the System.

How much the sewage treatment system will cost you? Results can vary widely. There are many factors that affect it, mainly depending on the scale, type, and level of water treatment. Be sure to shop around and compare prices from different manufacturers and suppliers to get the best deal.

wastewater treatment system cost

5). The Ease of Maintenance and Operation.

A wastewater treatment system is a complex piece of equipment and, like any other water treatment equipment, requires regular maintenance and upkeep to ensure it continues to operate efficiently. Be sure to choose a system that is easy to maintain and operate, and that comes with detailed instructions and technical support from the manufacturer.

By considering these key factors, you can ensure that you choose the best wastewater treatment system for your facility and your needs.

5. The Different Types of Wastewater Treatment Systems

The purpose of wastewater treatment systems is to remove pollutants in wastewater and sewage, such as heavy metal ions, chemicals, viruses, odors, etc. so that they can be purified and then safely discharged into the environment or reused. Listed below are several different types of wastewater treatment equipment, each with its own unique applications and benefits.

· Residential Wastewater Treatment Systems.

Residential wastewater treatment systems processes primarily use physical, chemical, and biological methods to remove pollutants from wastewater. These systems typically include primary treatment, which involves removing large solids and floating debris, and secondary treatment, which uses bacteria to break down dissolved and suspended pollutants. They include:

activated sludge, trickling filter, and rotating biological contactor (RBC) systems.

Figure 2 Activated sludge treatment.

Activated Sludge Systems.

Activated sludge systems use microorganisms that consume organic material found in wastewater. The microorganisms are then removed from the wastewater by settling.

Trickling Filter Systems.

Trickling filter systems use a bed of rocks or other material that is coated with bacteria, which breaks down the organic material in the wastewater.

Rotating Biological Contactor Systems.

Rotating biological contactor (RBC) systems use a rotating drum or disk with small plastic media that are filled with microbial films to reduce the levels of organic contaminants.

· Advanced Wastewater Treatment Systems.

Advanced wastewater treatment systems, also known as tertiary treatment systems, use additional processes to remove even more pollutants from wastewater. These systems may include processes such as disinfection, nutrient removal, and microfiltration. Additional advanced treatment systems such as membrane bioreactor (MBR) and anaerobic digestion have been developed in recent years.

Membrane Bioreactor (MBR) Systems.

MBR, or membrane bioreactor, is a wastewater treatment technology that combines biological treatment with membrane filtration. This type of system is known for its high efficiency and ability to produce high-quality effluent, making it a popular choice for wastewater treatment in various industries.

Figure 3 MBR wastewater treatment process.

Anaerobic Wastewater Treatment Systems.

Anaerobic wastewater treatment systems use anaerobic (oxygen-free) bacteria to break down organic matter in wastewater. These systems are commonly used for treating wastewater from food processing, agricultural operations, and other industries.

· Constructed Wetland Systems.

Constructed wetland systems use natural processes to treat wastewater. In these systems, wastewater is pumped into a series of shallow ponds or wetlands, where plants and microorganisms break down pollutants. Constructed wetland systems are often used in rural areas or for treating wastewater from small communities.

· Decentralized Wastewater Treatment Systems.

Decentralized wastewater treatment systems are small-scale systems that are designed for use in individual homes, buildings, or small communities. These systems may use a variety of technologies, such as septic tanks, composting toilets, and constructed wetlands, to treat wastewater on-site.

In general, the choice of the type of wastewater treatment system will depend on the specific needs and requirements of the application. Some systems may be more suitable for certain types of wastewater, while others may be better suited for different environments or locations. It is important to consult with a wastewater treatment expert to determine the most appropriate system for your needs.

6. The Investment and Operational Costs of Wastewater Treatment Systems.

Underneath, we will look at the investment and operational costs of some of the most common wastewater treatment systems.

· Activated Sludge Systems.

Activated sludge systems are one of the most widely used wastewater treatment systems today and are commonly found in aeration and sedimentation tanks. This system uses bacteria and other microorganisms to break down organic wastes in the wastewater and can stabilize wastewater with organic components. The bacteria are “activated” by the addition of oxygen, which helps to break down the waste and remove pollutants.

Activated Sludge Systems

The investment cost for an activated sludge system can vary depending on the size and capacity of the system, but it is typically in the range of $500,000 to $1 million. The operational costs for this system include the cost of chemicals and electricity for aerating the wastewater and maintaining the bacteria.

· Membrane Bioreactor (MBR) System.

The investment and operating costs associated with membrane bioreactor MBR wastewater treatment systems can be broken down into the following categories. Initial capital costs include the purchase of equipment such as membranes, pumps, tanks, etc., as well as installation and engineering expenses. Operating costs encompass membrane cleaning and maintenance, energy consumption for pumping water through the system, chemical use for pre-treatment and disinfection, biological treatment for nitrification and denitrification processes, sludge removal and disposal, and other labor expenses. In addition to these costs, MBR wastewater treatment systems also require careful monitoring and control in order to ensure optimal performance.

· Trickling Filter System.

The investment cost for a trickling filter system is typically lower than the activated sludge process and can range from $200,000 to $500,000. The operational costs for this system include the cost of electricity for pumping the wastewater and the cost of maintaining the filter media.

Figure 4 Trickling filter system.

The investment and operational costs of wastewater treatment systems can vary depending on the type of system and its capacity. Activated sludge systems tend to have the highest investment and operational costs while trickling filter and RBC systems are typically more affordable. It is important for municipalities and businesses to carefully consider the costs and benefits of different wastewater treatment systems before making a decision.

7. Conclusion.

In conclusion, choosing the best wastewater treatment system for your facility is a crucial decision that will have long-term impacts on the environment and your operations. By considering these factors and consulting with experts, you can select the best wastewater treatment system for your facility and ensure that your operations are sustainable and compliant with regulations.

NEWater is a professional wastewater treatment company. We can provide a one-stop service according to your wastewater treatment requirements. Our products are famous for their good quality and durability, and we also provide you with perfect after-sales service. For dependable wastewater systems of superior quality customized to meet your facility’s demands, contact NEWater today.

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