General information
UAB “Buiteka LT” NVB/AF batch-operated biological wastewater treatment systems are designed for the treatment of household wastewater and wastewater with similar chemical composition, in accordance with the currently valid wastewater treatment standards specified in the “Wastewater Management Regulation,” approved by the Minister of Environment by Order No. D1-236 on 17 May 2006 (2019 edition).
Characteristics of the proposed equipment:
- The equipment is environmentally friendly, as the aerobic microorganisms within it biologically break down wastewater pollutants, emit no unpleasant odors, and the treated wastewater is harmless and odorless
- The equipment operates quietly, as it has no moving parts
- Made from fiberglass, all the main external and internal structural elements are durable and resistant to corrosion
- The system consists of a single tank, so no additional primary treatment or supplementary treatment equipment is required
- The aeration method is through the use of an air blower
Operating principle and construction
The principle of household wastewater treatment is biochemical oxidation with activated sludge under aerobic (using oxygen) conditions. Aerobic microorganisms in the system break down organic wastewater particles into mineral substances (the main elements being carbon, nitrogen, and phosphorus)
*The volume of treated wastewater is indicated when its contamination, according to BOD5, is 260-360 mg O₂/l
NVB/AF 1 - Hatch; 2 - Upper part of the casing; 3 - Lower part of the casing; 4 - Aeration chamber; 5 - Inflow pipe; 6 - Air supply pipe; 7 - Diffuser; 8 - Filler; 9 - Secondary clarifier; 10 - Circulating sludge pipe (airlift); 11 - Treated wastewater outlet pipe. (The pipe connection directions shown in the diagram are for reference and are finalized during the ordering process.)
Wastewater flows by gravity through the inlet pipe (5) into the aeration chamber (4) of the system, where it is mixed with activated sludge during intense aeration. Air supplied by the blower is directed through the supply pipe to the lower part of the aeration chamber, where it rises through a diffuser in fine bubbles, saturating the mixture of wastewater and activated sludge with oxygen. In the aeration chamber, biological wastewater treatment takes place: microorganisms in the activated sludge break down organic pollutants into simpler chemical compounds, such as nitrites and nitrates, the majority of which are later oxidized to carbon dioxide and water
The mixture of treated wastewater and activated sludge flows over the horizontal overflow edge from the aeration chamber (4) into the secondary clarifier (9). In the clarifier, the clarified treated wastewater flows over the serrated edge into a circular channel and exits the system through the wastewater outlet pipe (11). The activated sludge in the mixture settles to the bottom of the clarifier due to gravitational force and slides to the bottom of the aeration tank. The activated sludge is lifted from the bottom by an air stream and mixed again in the aeration chamber (4)
An airlift (10) is installed in the aeration chamber, which is periodically activated, creating aeration, mixing, and resting (inactive) modes in the system. During the aeration mode, the airlift is inactive. The mixing mode is ensured by opening a valve. During this process, sludge is lifted from the bottom of the aeration chamber to the top, resulting in the removal of nitrogen compounds from the wastewater. Air bubbles rising to the surface of the secondary clarifier disturb the crust of floating sludge, causing the sludge to settle at the bottom of the system. During the resting (inactive) mode, the air blower is turned off, allowing carbon dioxide to escape from the wastewater
These modes are automatically controlled by a special controller installed in the air blower chamber
The contamination of treated wastewater with biogenic substances (nitrogen and phosphorus compounds) in treatment plants with a capacity of up to 5.0 m³3/dieną nuo 2019-11-01 yra normuojamas ir turi būti ne didesnis, kaip: NB < 25 mg/l ir PB < 5.0 mg/l. Biogenic substances are successfully removed by combining the nitrification and denitrification processes in the system, leaving only the amount necessary for the synthesis of activated sludge microorganisms and to sustain their biological activity
The system’s capacity is increased by concentrating the activated sludge through the “attached microflora” method, i.e., by adding the appropriate filler (8) into the aeration tank
OPERATION
To ensure the successful operation of the system, the pH of the wastewater entering the treatment unit must be within the range of 6.5-8.5. Therefore, large amounts of alkaline and acidic chemicals, paints, solvents, and other chemical substances should not be poured into it
Prohibited:
Pouring chemicals and biopreparations;
Connecting the wastewater generated during the regeneration (washing) process of water softening and iron removal filters to the system;
Connecting the wastewater generated in condensing boilers;
Connecting the wastewater from swimming pools, hot tubs, and other large tanks;
Connecting surface (rainwater) runoff;
Throwing or pouring into the toilet, sink, or directly into the treatment system any waste that may clog pipes and/or disrupt the operation of the entire system (potato peels, large vegetable and fruit waste, paper other than toilet paper, rags, etc.);
Pouring large quantities of cooking oil and other fats from deep fryers or pans.
When the treatment system is not in use, it must not be left empty!
UAB “Buiteka LT” stands for safety, quality, durability, and reliability
Household wastewater treatment systems are environmentally and human-friendly; the final decomposition products – the aforementioned mineral substances – do not emit unpleasant odors
- The tanks of the treatment systems are lightweight and strong, made from fiberglass resistant to mechanical impact and corrosion
- The treatment systems have no moving mechanical parts, which is why they operate quietly, do not break down, and last for decades
- It is a long-lasting structure that requires no complex maintenance, is easy to transport, and can be installed in the most convenient location on the property
- These are environmentally friendly household wastewater disposal solutions that meet European standards and are marked with the CE label
- We provide consultations on all matters related to the selection, installation, and operation of wastewater treatment systems
- Mineral pollutants: sand, clay, rust, calcium deposits, various slags, dissolved salts, and acids in water
- Organic pollutants are classified into plant-based and animal-based:
- Plant-based pollutants include vegetable, fruit, and grass residues, vegetable oils, and paper
- Animal-based pollutants include animal tissue and fat residues, and physiological secretions
- Bacterial-biological pollutants: various yeasts, mold fungi, bacteria, and other living microorganisms
Household pollutants can have various negative effects on human health. These pollutants can be of different types, including chemical, biological, or physical contaminants. Here are some of the main ways household pollutants can affect human health:
- Household chemicals: Chemicals used in everyday life, such as in cleaning products, cosmetics, pesticides, etc., can have negative effects on human health. Some of these chemicals may be toxic or allergenic, posing risks such as skin irritation, allergies, or even long-term health issues like cancer or hormonal imbalances
Water pollution: Pollution in water supply systems or natural water bodies can cause serious health problems. Harmful microorganisms, heavy metals, pesticides, and other chemical substances can contaminate water, making it unfit for consumption. People who consume contaminated water may experience digestive issues, infections, liver or kidney diseases, and other health problems