BIOTAL – is realisation of new, protected by patents, technical solutions, which allowed to comprehensively solve the traditional problems of small wastewater treatment plants.
Let us compare the BIOTAL plant with other plants of biological wastewater treatment as an example of the smallest productivity from 1.5 to 10 m3/day, because small treatment plants (STP) of such capacity are working in the most severe conditions of organic and hydraulic loads and it is easier to assess the level of technology on an example of such plants.
BIOTAL IS A UNIQUE SYSTEM IN WORLD PRACTICE THAT HAS:
- coarse impurities effective detention on the inflow in large, bubbled with air, stainless grid with a fixed lid and double-sided bubbling;
- 7-programmed automatic power control, which helps to save energy up to 70%;
- 7 -step cleaning with multi-loop straight and return sludge recirculation between the reactors, which provides wastewater treatment up to 99 %;
- automatic removal, stabilization and dewatering of active surplus sludge;
- remote control over the operation of BIOTAL plants with remote quality control of wastewater treatment.
OTHER ADVANTAGES OF BIOTAL PLANTS:
- unit of aftertreatment and disinfection of wastewater, which includes self-cleaning biological filter, fine filter and UV disinfection lamp;
- diaphragmless Japanese air blowers NITTO, which are significantly more expensive of diaphragm-type, but working without repairs over 10 years;
- all items are removable, allowing to repair the plant without interrupting its’ operation;
- block type automatic, allowing to repair it, replacing the damaged item without dismantling of control unit;
- alarm system in case of failure of any of the plant units;
- no odors at all stages of the plant operation;
As a result of sewage treatment, the following cleaning products are formed: purified sewage water, parameters of which correspond to the quality of water for technical purposes, and surplus active sludge, which after composting can be used as organomineral fertilizer.
Let’s consider in more detail the main advantages of BIOTAL plants over the plants of other manufacturers.
Detention of coarse impurities on BIOTAL plant occurs in large stainless grid of up to 500 liters with holes 3 mm in diameter, with two-way air sparging for breaking coarse impurities, fixed lid, which prevents loss of coarse impurities from grid to reactors when it is clogged in case of untimely service.
Using such a grid several problems were solved: to reliably protect the plant from rough clogging impurities and coarse impurities which lingered in the grid act as a biofilter, as gross sewage is aerated and agitated, it is gradually washed from fecal matter and is a source of food for microorganisms of active sludge during periods of absence of receipt of sewage to the plant.
In other plants – grid for coarse impurities detention is just absent or they have a small basket (20 l) with large holes (20 mm). The lid is absent. Not hard to guess where it leads. If there is no grid of coarse impurities detention, then the receiving chamber for a very short time will be clogged with debris, coarse impurities will lay on the bottom and to get them will be a big problem, they will flow to the rest of the treating zone scoring and disabling airlifts, and with them the all plant. The presence of 20-liter basket for coarse impurities detention with large holes will not help much, since the rough dirt will fall into the 20 mm setting with all its consequences, and when clogging the basket, the water level will rise in it, and because there is no cover, coarse impurities through the top of the basket will get to the plant, which will lead to clogging of airlifts and plant failure.
Of course, stainless grid of high resolution is expensive, but we always put their priorities quality and reliability.
Automatic power control depending on the number of incoming wastewater on BIOTAL plant solves several issues at one time:
• energy savings;
• resource saving of compressors and solenoid valves;
• hold the desired oxygen concentration in the reactor on the principle of the plant – the smaller amount of the wastewater enters the plant, the less time compressor supplies the air and vice versa.
Because of this, the plant copes with wastewater with high organic content, as well as, in the absence of receipt of sewage, reduces the activity of activated sludge bacteria by reducing the air supply, which ensures the normal operation of the system even after long absence of wastewater receipt to the plant.
Other plants do not solve these problems. In the best case, at some plants the host by himself in manual mode on a primitive relay sets the operation of the compressor, and other settings are switched to standby mode in the absence of receipt of sewage, but none of the competing plants does not regulate the air supply and the intensity of recycling between reactors depending on number of incoming sewage to the plant.
Automatically maintained the necessary concentration of activated sludge on the BIOTAL plant. Surplus sludge is not only automatically removed from the plant, but is also aerobically stabilized in aerobic stabilizer, so well is dewatered in the sludge bag, while its volume decreases by 15-20 times. It is generally known that the surplus sludge is formed during the biological purification. If to count per person, it will be in the range of 7-8 liters sludge mixture (99.5 % moisture content), which corresponds to 1.5 L of settled sludge in the sludge stabilizer (98 % moisture) or about 0.1 kg of dehydrated (85 % moisture) in the sludge bag per day. In order to prevent activated sludge growing in the plant, and to be constantly in the required amount of cleaning (4-6 g/l) , it is necessary to remove surplus sludge from the system regularly. Our plant for private house has a bag of dehydration with capacity of 200 liters. Amount of dewatered surplus sludge in such bag is equivalent to a sludge container up to 4 m3 (dry sludge). In practice, the bag is filled from 3 to 6 months, and then dewatered sludge should be removed from it and disposed. Lifetime of a bag is from 3 to 5 years. Statement of some manufacturers that their 200-liter sludge tank (98 % moisture) requires removal of sludge 1-2 times per year is untrue. From the plant for up to 6 people, must be removed every day 6×1,5 = 9 liters of sludge of 98 % moisture content, ie sludge tank for 200 liters is enough for about 20 days. After 20 days, no longer sludge water but sludge from the sludge tank will begin to flow back into the plant. Sludge concentration in the plant will start to grow, respectively, will drop the amount of dissolved oxygen in the activation zone, sludge will start to flow from the plant with effluent, and an anaerobic process will begin with the release of hydrogen sulfide, which leads to the stench. Naturally, cleaning stops, the system fails. Other manufacturers also went further – they assert that there is no need at all for sludge to be regularly removed from the system, but rather 1-2 times a year from the plant to pump it with a sewage truck. No comment here as in a month such plant will turn into stinking septic tank.
Application of diaphragmless Japanese compressors NITTO at BIOTAL plants allows their work without repair up to 10 years, followed by the replacement of non-expensive Teflon piston.
In membrane compressors used by competing firms, the membrane should be changed every two years. In addition, the membrane may be torn, because it loses its elasticity over time and temperature changes, and before the expiration of 2 years that immediately lead to the corruption of system. Also the loose is possible at the joints, causing the air escape.
Comparison with other WTP systems
BIOTAL and other technologies (comparison of WTP systems, capacity from 1,5 to 10 m3/day)
|№ || Characteristics of WTP || BIOTAL || Other WTP |
|1||The presence of a large stainless steel grid for coarse impurities detention with bilateral bubbling||Yes||No|
|2||Automatic adjustment of its capacity when changing the number of incoming wastewater||Yes||No|
|3||Aerobic stabilization and dewatering of activated surplus sludge||Yes||No|
|4||Double-sludged wastewater treatment system||Doublesludged||Monosludged|
|5||Seven-staged wastewater treatment system||Yes||Max four-staged|
|6||unit of aftertreatment and disinfection of wastewater, which includes self-cleaning biological filter, fine filter and UV disinfection lamp||Yes||No|
Thanks to the new technical solutions, the high quality of manufacturing and use of quality materials and equipment from leading world manufacturers on BIOTAL plants, they operate reliably and economically, providing efficient sewage treatment.