Tehnikum ltd brings together a team of engineers with decades of experience in the field of water purification and filtration, as well as sludge dehydration, which has over 100 realized projects and plants in this field.
We provide complete technological solutions from testing and finding technological solutions, design, production, installation of plants and treatment devices:
We offer our clients technological solutions, design, manufacture and installation of equipment, proof of parameters for discharge, „turnkey“ system.
Our plants, systems and devices are designed and manufactured to meet all investor requirements, implementing legal standards, technological achievments and economic justification.
We manufacture plants for WASTEWATER TREATMENT FROM VARIOUS INDUSTRIAL PROCESSES, such as:
Mechanical treatment in wastewater treatment technology includes equalization, separation of coarse material on grids and sieves, separation of inert, sediment and fittable particles, as well as separation of fats and oils.
Insoluble, larger and floating substances are removed from the wastewater with the help of gratings. The separation of these substances is done in order to protect the devices and pipelines from damage and congestion and to facilitate the treatment of wastewater.
(coagulation, neutralization, flocculation, reduction of chromium, oxidation of cyanide, etc.)
Chemical treatment involves the addition of chemicals to wastewater to convert dissolved, suspended components into insoluble forms, oxidation and reduction reactions, adjusting the pH of wastewater.
We design, construct and manufacture:
We produce fully automatic chemical dosing systems: coagulants, pH correction, flocculants, etc.…
The DAF (Dissolved Air Flotation) device is used to separate dispersed and suspended particles. It is based on making a supersaturated solution of air in the wastewater, and then introducing it into the flotation pool.
The air disperses from the bottom of the pool and on its way to the top "collect" the particles, and by the thrust force it carries them to the surface.
Dissolution of air can be achieved in the inlet water stream itself, in the part of the inlet stream or in the recirculation flow of purified water.
Flotation is a process of mechanical separation based on making a supersaturated solution of air in wastewater. Micro bubbles come into contact and bind with suspended matter and allow them to reach the surface and float. The air disperses from the bottom of the pool and on its way to the top "buys" particles, and the force of the thrust carries them to the surface.
The coagulant neutralizes the electrostatic load of colloidal particles, and enables their agglomeration into flocs. The polyelectrolyte binds the neutralized particles into even larger flocs.
The tubular saturator has a unique construction, and enables air bubbles measuring 10-70 micrometers, which gives exceptional efficiency.
Dairy industry, ice cream production, juice production, alcohol production, breweries, meat and fish processing, fruit and vegetable processing, drinking water, etc.
Plastic recycling, chemical industry, oil and gas, textile industry, textile industry, leather industry, laundries, packaging washing, etc.
Advantages of our DAF Systems:
- Very high degree of reduction of polluting parameters
Reduction rate from 90-99%
Oils and fats
Reduction rate from 90-99%
Reduction rate from 70-80%
Reduction rate from 70-80%
- Comprehensive and efficient solution that provides high stability and efficiency of dirt removal. Reliable method for technological wastewater treatment
- Simple installations provide a compact set of equipment and take up very little space- Great savings because the design of the system and technological parameters provide low consumption of energy, air and chemicals.
- Very stable operation of the coagulation, neutralization and flocculation systems
- Low degree of turbulence, no retraction of floating sediments.
- We have a developed package of digital services that allows monitoring and optimization of DAF system operation remotely, and remote-control systems.
Instead of classic lamellas, we use special "U" profiles that allow:
The DAF device is made of stainless steel.
We can deliver complete systems or repair and upgrade existing DAF devices.
Types of precipitators:
Sedimentation tanks are made of stainless steel, HDPP, HDPE, carbon steel with anti-corrosion protection.
For those reasons, the Lamellar sedimentation tank has a much smaller volume for the same capacity compared to the classic Static sedimentation tank.
The materials from which we make sedimentation tanks can be stainless steel, carbon steel with anti-corrosion protection, HDPP (high density polypropylene), concrete, etc.
This type of sedimentation tank effectively combines the separation of solid materials from liquids with the coarse separation of fats and oils from water, while in the conical bottom of the sedimentation tank the separated sludge is compacted. All three processes are accelerated by fine vibrations originating from vibrating motors attached to the conical bottom.
These sedimentation tanks can be used in a wide range of process industriy and utilities, in the preparation of clean process water in various industries, preparation of drinking water, various recirculations and reuse of manufactured fluids, industrial and municipal wastewater treatment processes, and in the revitalization of useful products and processing of intermediate products in various production processes.
Due to the special construction and the principle of operation, these sedimentation tanks can reach a capacity of 400 m3 / h per device - unit.
The water retention time in the sedimentation tank with package inserts is 5-15 minutes.
For the same deposition effect, the LAMELAR SEDIMENTATION TANK has a 10 times smaller volume compared to the SEDIMENTATION TANK. It has a smaller volume 10 times.
HOPPER BOTTOM TANK in relation to the STATIC SEDIMENTATION TANK has a smaller volume up to 20 times, and in relation to the LAMELAR SEDIMENTATION TANK up to 4 times.
Biological wastewater treatment is based on the removal of dissolved organic matter and non-sedimentary colloidal particles by the action of microorganisms found in activated sludge. Classical biological treatment of wastewater is based on primary sedimentation, removal of pollution by microorganisms, secondary sedimentation of activated sludge.
The SBR (Sequential Batch Reactor) operates in batch mode with aeration and sludge deposition in the same reactor. The process is based on reactor filling, reaction, decantation and standstill. The main advantages of SBR are efficiency at lower flows, and at very high loads, flexible process management, easy installation, less need for space and very good sludge quality.
SBBR (Sequencing Batch Biofilm Reactor) is an improved design of the SBR reactor, which is based on the existence of a biofilm carrier, which increases the concentration of biomass presence. The advantages of SBBR are the same as with SBR, except that the efficiency of MBBR devices is higher due to the presence of biofilms.
MBBR (Moving Bed Biofilm Reactor) technology is based on specially designed plastic biofilm carriers that are suspended and continuously moving inside the reactor of a certain volume in which aeration is performed. The main advantages of the MBBR process are a longer lifespan of biomass compared to conventional activated sludge treatments and more stable wastewater treatment process.
The advantages of MBBR technology:
MBR (Membrane bioreactor) technology is based on the removal of pollution by a combination of microorganisms and microfiltration, which eliminates the need for the existence of a secondary sedimentation tank. In addition, the MBR forms a very efficient removal of organic pollution, which is accompanied by a constant quality of outcoming wastewater or a unique quality of wastewater in relation to larger fluctuations in the quality of incoming water.
The advantages of MBR systems:
Our MBR systems meet very strict requirements for achieving the quality of purified water that can be reused by:
It has one of the most stringent and demanding certificates in the world for reuse of purified water:
< 0,2 NTU 5% 24 hours
< 0,5 NTU always
Biological purifiers can be placed in the tanks made of concrete, steel, or can be a container type.
Biological wastewater treatment plants of container type
Aeration systems: diffusers, low-pressure compressors - "blowers", pipes and pipe fittings, media carriers (bacteria) for MBBR systems.
Comparative overview of parameters obtained during wastewater treatment with different types of biological reactors.
We make complete systems of automatic control of plants: regulation and management of technological parameters that are necessary for the correct operation of the system. Programs that manage systems via PLC in accordance with the prescribed technology and optimize the work of all consumers.
Delivery of complete cabinets, development of application software, connection, installation of probe measuring and regulating equipment (pH, Rx, O2, etc.), flow meters, levels, etc.
Commissioning and training of employees.
Development of a system for treatment of sludge generated in the process of sedimentation, flotation, and biological treatment as products in various industrial processes.
Devices and equipment used for sludge dehydration: filter presses, decanters, dick presses, thickeners of various capacities, devices with dehydration bags, etc.
FILTER PRESSES are machines for separating solid particles and liquids from a suspension that is transported by a high-pressure pump.
DISK PRESSES can dehydrate waste sludge directly from the oxidation chamber (there is no need for gravity thickening tanks). It is suitable for 24-hour work, with occasional control.
DEHYDRATION DEVICE WITH FILTER BAGS for sludge dehydration consists of several bags whose size and characteristics are selected based on the composition and amount of sludge. The sludge enters the inside of the bag, where solid particles remain on the fabric, while water passes through the fabric.
CENTRIFUGAL SEPRATORS remove the solid phase from the liquid by the action of internal centrifugal force which is the result of the speed of rotation of the vessel of large diameter.
ATMOSPHERIC WASTEWATER TREATMENT
There are many situations in which a quick and easy solution is needed to temporarily solve the problem of wastewater treatment.
In addition to the construction of classic plants, Tehnikum Tehnologije also offers mobile devices and equipment for wastewater treatment and dewatering (filtration) of sludge ...
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DAF (Dissolved Air Flotation) device is used for separation of dispersed and suspended particles from wastewater. Flotation is a mechanical separation proccess based on making supersaturated air solution in wastewater, meaning that micro bubbles make contact and connect with suspended substances and enable them to reach the surface and float.The air is being dispersed from the bottom of the pool, t it “collects” particles on it’s way up and pushes them to the surface. Coagulant neutralizes the electrostatic load of colloid particles and enables their agglomeration into floccules. Polyelectrolyte connects the neutralized particles into even bigger floccules. Piping saturator has a unique construction and enables air bubbles with dimensions 10-70 micrometers, what provides an extraordinary efficiency. AREAS OF APPLICATION AND MAIN APPLICATIONS Milk industry, ice cream production, juice production, alcoholic beverages production, breweries, fish and meat processing, fruit and vegetables processing, drinking water, etc. Plastic recycling, chemical industry, oil and gas, textile industry, leather industry, laundry services, package washing etc. Advantages of our DAF Systems: - Very high level of reduction of pollution parameters Suspended substances Reduction rate from 90-99% Oils and fats Reduction rate trom 90-99% BPK5 Reduction rate from 70=80% HPK Reducstion rate from 70-80% - Comprehensive and efficient solution which provides high stability and efficient removing of dirt. Reliable method for refining of technological wastewater. - Simple installations provide compact equipment set and saves space. - Major savings because the system construction and technological parameters ensure small consumption of energy, air and chemicals. - Very stable functioning of coagulation, neutralization and flocculation systems. - Law level of turbulences, there is no re-retraction of floating sediments. - We have available a developed digital services package which provides follow-up and optimization of the DAF system long-distance working and remote controllie of thesystems. - Instead of classical lamellas, we use special “U” profiles which provide: Separated flowi of wastewater and clean water Equal distribution of wastewater flow and sectors load, decreasing the turbulence There is no obstruction of flow of flotants Flow leaders secure less consumption of polymers DAF is a device made of stainless steel We can deliver complete systems or rebuild and upgrade existing DAF devices.
Type of wastewater: technological wastewater from battery production and recycling Capacity: 700 m³/day, 29 m³/h Table 1: Types of wastewaters and damaging and dangerous substances generated during the production process Types of wastewater Origin Existing hazardous and dangerous matters Alkaline rinsing water Workspace and streets cleaning Lead and dust Sour rinsing water with high concentration Paste mixer and shepherd machine washing Pb, PbO2, PbSO4 Neutral concentrates Wet Ventures - scrubbers Pb, Sn, Sb, hydroxides Water from battery formulation Charging battery with acid Sulfuric acid Water from battery recycling Cutting and emptying of battery Sulfuric acid, Pb, PbO2, PbSO4 Outgoing water quality Purified wastewater from the treatment plant should satisfy the following limit values for discharing into the land waters (in this case a small river). Limit values are extremely low for some hard metals, which are contained in these wastewaters, such as: Cadmium – 0,1 mg/l Lead – 0,5 mg/l Iron – 2 mg/l Sulfates – 250 mg/l Suspended substances – 35 mg/l BPK5 – 25 mg/l HPK – 125 mg/l, etc. The investor’s request was to deliver a technological solution – Technology for wastewater processing through the project: machine, electro and measuring regulating equipment, electro-commanding cabinet with PLC and software, launching and a guarantee that the required parameters will be inside the limit values. Plant working regime: Continually (moze I : non-stop), 24h/7 daysOV generated during he production process are being treated trough three lines: Water line Dirt line Preparation and chemicals dosing line These technologies are being established on the water line: Egalisation Neutralisation Neutralisation II and removing of sulfates Coagulation Flocculation Sedimentation Clarification of sedimented water Final control These technologies are being established on the preparation and chemicals dosing line: Preparing a dosing solution Dosing the solution The system is completely automatized, with support of electro- commanding cabinet with SIEMENS PLC, software and measuring regulation equipment. After the equipment is delivered and the system is launched, chemical analysis of the purified OV have been done in an accredited lab. Those analysis showed that all parameters were inside the limit values.
Filter plates at Mebrane filter press are equipped with membranes that enable additional "squeezing" -dehydration of the filter cake. Increasing the filling pressure ensures precompression and drainage of the filter cake in the chamber. When the filling pressure reaches a predetermined value (approximately 6-8 bar), the filter cake is additionally exposed to the membrane pressure, and additionally "squeezed". Elastic membranes, which can be made of polypropylene (PP) and synthetic rubber (NBR, EPDM), use compressed air to press the filter cake over the entire surface of the chambers. Additional compression thus expels free water through the filter cloth. ADVANTAGES OF MEMBRANE FILTER PRESSES: • More economical filtration due to high degree of drainage and shorter cycle time Maximum flexibility for expansion and automation possibilities Extended pump life in the case of abrasive media, due to low supply pressure CASE STUDY: Delivery of membrane filter press with the dimensions of plates 1000x 1000 mm, 36 plates, volume 770 liters, for filtering the solution of lead "paste" in the process of battery recycling. Investor "TAB MAK". The press is equipped with: membrane plates with EPDM membrane, system for automatic opening of plates, "Squezing" system for additional dehydration of filter cakes, "drip tray" system. Degree of dehydration of filter cakes: 80-90% dry matter..