Which condtruction works should be performed by the customer for monoblock plant installation
- The amount of construction work depends on the type of plant used. Monoblock plants can be installed in one or two concrete wells, and also without the use of reinforced concrete wells (BIOTAL plants of increased strength). All construction work must be carried out in strict accordance with the working design of the plant. Dimensions of the wells, their mutual placement, operating holes in the walls of the wells must correspond to the drawings of the working draft. It is necessary to pay attention to the quality of the waterproofing of the wells. When placing the blowers and the control unit in a separate room, it is necessary to provide cases or a duct for the air ducts from the blower room to the BIOTAL plant. When supplying sewage to the plant, it is necessary to provide a well for the submersible pump. When supplying treated wastewater to watering of green plantations, it is necessary to provide a storage well.
What else needs to be prepared for the installation and commissiomimg of the BIOTAL monoblock plant?
- For plant installation, except as provided above, you must prepare a dry mixture of sand and cement – about 1.5-2 m3 of sand, and about 200-300 kg of cement. For commissioning also is needed to prepare water in an amount of about 75% of plant capacity, as during commissioning plant is filled with clean water.
Where should the compressors and automation be placed — inside the plant, in a box-recuperator over the plant, or in a basement or utility room?
There are three options. The key difference is where the compressor draws its inlet air from — this determines both the quality of the aeration and the lifespan of the equipment.
1Inside the plant itself (the approach of many competitors) — not recommended.– The compressor draws air from the plant's own interior — air that is already depleted of oxygen and saturated with moisture, so the biological process gets less oxygen.
– High humidity and condensation inside the plant shorten the lifespan of the compressors and automation.
– In winter, cold air is fed into the plant, which reduces the biological activity of the activated sludge microorganisms.
– Electrical equipment inside the plant is also a safety concern.
2Box-recuperator mounted over the plant (the standard BIOTAL solution).– The compressor sits in a sealed box on top of the plant, so moisture from the plant interior and condensation never reach the equipment.
– The box draws fresh air from the street, so the plant receives oxygen-rich air for the biological process.
– The box preheats the incoming air using the heat of the wastewater: according to tests, the air injected into the plant is at least 10 degrees above the ambient temperature — a built-in advantage in winter.
– The best choice when the plant is located far from any building or utility room.
3Utility room or basement of the building (when the building is close).– The compressor runs in a warm, dry room (temperature above 0C, low humidity), where it works several times longer — no winter temperature swings, no condensation.
– The warm compressed air is delivered to the plant reheated up to +30 C, which compensates for the plant's winter heat losses.
– The airflow also ventilates the room where the compressor is installed.
– No need to go outside to control and adjust the plant.
– The extra cost is modest — four 20 mm air ducts and a single cable over 20-25 m (materials around $50) — and a trench between the building and the plant is needed anyway for the wastewater discharge, so the ducts and cables are laid in the same trench.
Does the BIOTAL plant cleans up to the quality of drinking water?
- There are methods of wastewater treatment to drinking water quality, and their innumerable, but they are used only in laboratories and for maintenance of space stations and submarines. When we speak about the use of equipment for wastewater treatment in everyday life, it is impractical to install equipment for wastewater treatment to drinking water. First, it is not profitable, and it is forbidden by sanitary standards: one liter of purified water in this way will cost more than a liter of bottled and secondly, you need to take into consideration the psychological factor. Therefore, the best option today is to purify the waste water up to the quality of technical, with the re-use it for technical purposes. In this way we save drinking water consumption.
Do I need to buy a grease separator?
- Yes, if your object of disposal is a cafe, restaurant, sanatorium, etc. Drains from the kitchen subject to prior purification, for this before mixing with other household waste water grease separators must be installed.
Among BIOTAL plants there are plants with a block for dehydration of surplus active sludge. How often should I extract sludge from such plants?
- Surplus activated sludge from BIOTAL plants with a block of dehydration should be withdrawn from the dehydration block not frequently than once in three months if it is a plant for a private house. Plants operating with overloaded with organic sewage from cafes, office buildings, petrol stations, etc. require more frequent recesses of sludge.
When should monoblock plants be installed in reinforced concrete wells?
- Monoblock plants should be installed in reinforced concrete wells in the following cases: 1. At a high level of groundwater. In heavy rains, the level of groundwater can rise and tear the unit out of the ground (due to the strength of Archimedes), destroying it, or deform the walls of the plant, reducing its volume. The cost of plant is incomparably higher than the cost of a reinforced concrete well building. 2.When installing the plant on the roadway.
Some companies refuse to use level sensors on small plants, since they have problems. You continue to apply them.
- Without the level sensors it is impossible to organize the automatic power control of the plant according to the amount of incoming wastewater. Without this:
– excess electricity is wasted during the absence or the small amount of incoming wastewater;
– compressors and solenoid valves are worn out;
– activated sludge is mineralized, with prolonged absence of receipt of waste water, which leads to the cessation of biological treatment, and for the restoration of the biological process must be at least 1-2 weeks. In order to avoid problems with level sensors, it is necessary to apply quality float sensors (in BIOTAL plants float sensors Grundfos (Germany) are used), and stainless steel electrode sensors with self-cleaning system. Therefore, the problem with the sensors practically do not occur;
– but if any of the sensors fails, the plant work automatically switches to the timing diagrams of the normal mode, alarm triggers, but purification process is not violated.
