Domestic wastewater is wastewater generated during human daily activities such as cooking, bathing, cleaning, etc. Domestic wastewater contains many Different ingredients in large amounts are organic substances such as proteins, hydrocarbons, and cellulose, accounting for about 52-55% of the remaining inorganic substances. Besides, domestic wastewater also contains viruses and bacteria that cause digestive diseases and typhoid. Therefore, having a domestic wastewater treatment process is an extremely important issue.
Image of domestic wastewater pouring into To Lich River (Hanoi)
Technological process of domestic wastewater treatment
To invest in a domestic wastewater treatment system with not too high initial investment costs, effective treatment and low operating costs, Hasy Environment we offera domestic wastewater treatment processusing biological methods.
Below is the domestic wastewater treatment technology line that we have successfully applied in a number of buildings, resorts, and resorts.
Diagram of domestic wastewater treatment technology line
Explanation of the technological process of domestic wastewater treatment
Domestic wastewater treatment process is divided into 3 stages:
Phase 1: Preliminary treatment
Wastewater from the kitchens flows through the garbage screen. Passes through the grease separator tank and transfers it to the air conditioning tank. Domestic wastewater now enters the septic tank. Flows through the trash screen and transfers to the equalization tank.
Garbage screens are used to retain large coarse impurities that cause blockages and damage to pipes and equipment such as paper, trash, plastic bags, bark, gravel, rocks, etc.
Wastewater in the kitchen contains a lot of grease, causing clogged pipes. Therefore, it is necessary to have an grease separator to remove grease before flowing into the conditioning tank. The equalization tank is the place where wastewater is stored before entering the biological treatment stage. This is a place that helps stabilize the concentration and flow of waste streams.
Here, an aeration system is arranged to create disturbance to avoid sedimentation. At the same time, anaerobic decomposition in the tank. Along with that, arrange a submersible pump. Submersible pumps pump wastewater from the equalization tank into the biological treatment system.
Phase 2: Biological treatment
The biological treatment system includes two tanks: Selector tank and SBR tank.
Selector tank is a place to adjust pH value and add nutrients such as nitrogen, phosphorus, carbon to microorganisms. This is the place that helps stabilize and create the most favorable conditions for microorganisms to grow. In addition, the design of the tank significantly reduces the number of filamentous microorganisms. This type of microorganism makes it difficult for sludge to settle, resulting in poor quality of treated wastewater.
Image of Decanter collecting water in the SBR tank of the domestic wastewater treatment system
After being added and adjusted to the values in the Selector tank, wastewater is directed into the SBR tank. In the tank, install a gas distribution system to provide oxygen for microorganisms to grow and process organic substances. The tank operates in three processes: Filling – reactive aeration (accounting for 50% of the entire process time), settling without aeration (25% of the process time) and draining (25% of the process time). progress).
- Filling process – reactive aeration: Wastewater from the Selector tank enters the SBR tank, during this time, continuous aeration is carried out to expose microorganisms to organic substances. organic matter in wastewater, while creating an aerobic environment for microorganisms.
- Settlement process: After completing the filling process – reactive aeration, the entire blower is turned off to allow the solids to settle into the tank.
- Draining process: at the end of the settling process, the water will be led out into the disinfection tank. A portion of excess sludge will also be discharged into the sludge tank.
In the SBR tank, most of the pollutants in wastewater such as BOD, COD, Nitrogen, Phosphorus are removed through biological treatment. You can refer to the article wastewater treatment using SBR technology.
Phase 3: Disinfection
Water after biological treatment will drain to the disinfection tank. Here, the wastewater is exposed to the disinfectant chemical Chlorime at the appropriate dose in a zigzag flow to facilitate contact between the wastewater and the disinfectant chemical with the purpose of killing microorganisms, bacteria, and fungi. virus.
Treated wastewater ensures to meet discharge standards QCVN 14:2008/BTNMT.
What are the advantages and disadvantages of using this SBR technology?
Advantages of SBR technology:
- Treat organic substances thoroughly
- High efficiency in treating pollutants
- High nitrogen and phosphorus reduction ability
- Suitable for all systems, all capacities
- Save space
- Flexible during operations
- No need to use a separate settling tank
- Easy to control problems
Disadvantages of SBR technology:
- Operation is more complicated than traditional aerotanks
- Requires operators to have professional qualifications
- Batch treatment requires stable input wastewater
Operation and maintenance costs of the system
- Reduce operating costs such as: Chemicals, electricity
- The system runs stably so there is no need for regular system maintenance.
Hasy Environment is a unit that has many years of design and construction of domestic wastewater treatmentsystems for businesses, we are always proud to bring to you sell a quality product.
If you need technical advice, please contact us immediately at 0972221068 or website http: //xulymoitruong360.com for free support and advice.