Tháp Stripping xử lý Nitơ trong nước thải

Wastewater generated from pig breeding area is mainly from pig hygiene stage and barns containing manure, urine, leftovers ... characteristic of pig breeding wastewater is containing organic compounds, N, P is high and contains many pathogenic viruses such as foot and mouth disease, blue ear epidemic ... therefore need to go through the waste water treatment system to avoid affecting the environment and especially the lives of people around.

Process of nitrogen gas treatment in waste water by stripping tower:

•  Biogas reactor HB-01

Pig waste water after separation process by raceways to Biogas cellar HB-01 is lined and covered with tarpaulin to contain wastewater in anaerobic conditions.
In Biogas tunnels, the uPVC pipe system creates a natural vortex flow that helps waste water stir naturally in biogas tanks; At the same time, uniformly distribute the amount of wastewater in the biogas reactor. Anaerobic fermentation, microorganisms perform basic tasks: biogas production; decomposing complex organic waste into simple organic matter such as methane, carbonic ... thus reducing pollution targets in waste.

• PH pH adjustment tank 1 T-01

PH 1 adjustment tank receives waste water after biogas digester. Here, the wastewater is adjusted to pH by an alkaline solution to bring the pH to a suitable level to create an optimal environment for the denitrification process.
Continuous pH control is carried out by automatic pH control device - pH Controller. The mixing device also activates continuous mixing, giving the contact process between the wastewater and the pH adjustment chemical the best.

• Buffer tank 1 T-02

After pH adjustment process, waste water flows to the buffer tank which is pumped to the nitrogen reduction tower for treatment.

•  Nitrogen reduction tower TB-01

Nitrogen removal tower operates according to the mechanism: water will be pumped from the top down and the fan blows air up from the bottom up, the purpose is to remove NH3 gas. At high pH, ​​it has the effect of reducing Ammonium because NH3 <=> NH4 + reaction is not stable. In the tower, there is contact material to increase the contact area between air and waste water, NH3 gas is blown out.
Air blowing method at high pH, ​​Ammonium in water exists in the form of balance:
NH4 + <=> NH3 (dissolved gas) + H + with pKa = 9.5
Thus, at nearly 7 pH only a very small amount of NH3 gas compared with NH4 +. If we raise the pH to more than 10 ratios [NH3] / [NH4 +] = 1, and the more pH equilibrium moves towards the formation of NH3. When applying air blowing techniques, NH3 will evaporate according to Henry's law, turning the balance to the right: NH4 + + OH- <-> NH3 levitation + H2O

• Adjustment tank pH 2 T-03

Waste water from the denitrification tower is directed to pH 2 adjustment tank.
Before entering the oxidation raceway, wastewater is adjusted to pH by acid solution to bring the pH to an appropriate level (pH = 6.5-7.5) to create a favorable environment for microorganisms to grow.
Continuous pH control is carried out by automatic pH control device - pH Controller. The mixing device also activates continuous mixing, giving the contact process between the wastewater and the pH adjustment chemical the best.

• Buffer tank 2 T-04

After adjustment of pH 2, wastewater flows to the buffer tank 2 pumped to the Oxidation raceway to continue processing.

• T-05 improved oxidation raceway

Wastewater from 2 T-04 buffer tank is pumped into Improved Oxidation raceway.
Improved Oxidation Ditch is shaped like a racetrack and equipped with partition walls along the length of the tank. The mixture of water and mud is mixed with gas by a vertical shaft surface aeration machine with a low rotation speed (23 - 35 rpm). The use of these aerators ensures proper mixing is carried out, creating horizontal flow and certain disturbance in the tank to avoid sludge settling to the bottom of the tank.
While wastewater flows into a ring in the tank, aerobic microorganisms (activated sludge) decompose organic compounds and nitrogen (N) compounds. Depending on the transport state we are using, the wastewater and sludge mixture will flow through oxygen (aerobic), oxygen-depleted (anoxic) and anaerobic areas to carry out the processes. N type and Phosphorus (P) by biological method.

•  Sedimentation tank T-06A

After finishing the biological treatment process in the Improved Oxidation Trench, the wastewater is directed into the settling tank to separate the mud and water by the gravity deposition method. A part of the bottom mud of the settling tank is transferred to the bio-slurry compartment and re-circulated to the Improved Oxidation Trench with a circulating pump system. Residual sludge is pumped into the sludge tank. Waste water leaves the settling tank according to the drainage pipe to the 100,000m3 aquarium (Investor performs, need to seal HDPE silver) for reuse.
On the way to the aquarium, waste water is chemically disinfected from a storage tank to disinfect the water.
The treated water meets the effluent standards.

Process of sludge treatment

•  T-07 sludge storage tank

All sludge generated from the biological treatment process is brought to the sludge tank to conduct the process of sludge disintegration, reduce moisture by gravity. Mud at the bottom of the tank is pumped into the sludge press. The water separating the mud on the surface is returned to the collection pit to continue processing.

• Conveyor mud presses

Periodically, the sludge from the sludge tank is pumped into the belt sludge press. Mud before being pressed is mixed with polymer to improve the efficiency of sludge pressing. The dried sludge after pressing will bring it to the right place. The excess water from the sludge presser by the pipeline to the collection pit continues to be treated.

Finish the process.

Please take a look at some of the pictures that our company has implemented. If you want to handle Nitrogen by Stripping Tower, please contact us immediately at the phone number:
Tel: 84 (028) 3842 9192
Fax: 84 (028) 3811 2859/62
HP: 84 (0) 968 772 597
Or you can come to our office at 27 Le Trung Nghia, Ward 12, Tan Binh District, Ho Chi Minh City.