LLP "Caspian Eco service" carries out services in cleaning of vertical steel tanks (VST) using specialized mobile complex MKO-1000 (patent number 2194632), purchased from the creator of the invention "Pure World M" ("Чистый Мир М"). The complex is equipped with permits for work at the facilities of oil products: Certificate of Conformity № ROSS Russian RU.AB39.A04079, permission from the Federal Service for Ecological, Technological and Nuclear Supervision, Environmental Certificate of Compliance № 00001490. Complex also approved for use on the territory of the Republic of Kazakhstan . The system is designed for cleaning (washing) storage tanks of oil, petrol station, tank farms and other facilities, including storage tanks of industrial water.

Application of the MKO-1000 technology of separation of hydrocarbon compounds from the surfaces based on the invention of specialists "Pure World M" ("Чистый Мир М") (patent number 2194636), which is in the use of a closed-loop water cleaning solution with a technical detergent, forming an unstable emulsion with hydrocarbon compounds. Feature of the method is the gravity separation of the emulsion into an aqueous solution, oil and mechanical impurities, the solution is used repeatedly.

The essence of technology is in the regeneration of the washing solution by phase separation of the emulsion to the hydrocarbon, the aqueous solution with detergent and mechanical particles and the subsequent transfer: hydrocarbon for technological purposes, an aqueous solution in the cleaning cycle and mechanical impurities for disposal (for example, in the construction of roads waterproofing).

The main process of the technology is separation of hydrocarbon compounds from the surfaces using detergent creating wedging effect with high demulsibility. As detergent can be applied all known compounds capable of initially emulsify oil rpoduct, and then separate the components of emulsion. Company "Pure World M" ("Чистый Мир М") in conjunction with the Institute of surfactants and industrial enterprises of the defense industry developed new versions of detergent, characterized by high demulsibility and the degree of washing compared to peers.

Technical detergent has several modifications that are specifically designed for different types of contaminants. Using in the research physical, chemical and technological methods, we have developed the optimum compositions of detergent and technology of cleaning. Detergent is used as an aqueous solution with a working concentration of 1 to 3% by weight., does not contain alkalis and phosphates, has 4th hazard class according to GOST 12.1.007-76 does not affect the quality of the oil product and the state of metal.

The principal feature of the detergent is the balance of the composition, which provides:

Process steps of tank cleaning:

After removal of the oil residue, is produced tank washing with detergent by technical machines.

For dark oil products solution temperature should be 50-60°C in summer and 70-80°C in winter. The pressure ensures penetration of detergent in the surface layer of the oil without creating a splash, which, when separated from the surface can be charged with static electricity. The pressure of the jet at the outlet from the nozzle is 10 bar. Throw distance is 25-30 meters. Performance and the number of wash cycles depends on the degree of contamination and oil viscosity group.

To pump detergent from the tank together with the remnants of the oil and oil sludge using a membrane or slurry pump.

Entering the MKO emulsion passes through the following stages of purification and separation:

  1. Emulsion evacuated from the reservoir flows through the coarse filter, which is installed in front of a diaphragm pump, where the large mechanical particles are separated, and enters the cascade gravitational trap for mechanical impurities, where the emulsion bulk solids is released, pumped into a special container for disposal.
  2. Next, the emulsion is fed to a hydrocyclone, where is separated the light fractions of mechanical impurities.
  3. After hydrocyclone emulsion passes through the filter and into the damper mazes of MKO with technical detergent, where the oil is separated from detergent. Water is connected with aqueous solution, and oil product, through high demulsifying ability of detergent is separated from the emulsion and passed to the oil tank. The process is repeated if necessary.

Disposal of residues from the bottom of the tank, irrespective of the form of sludge, is the most important part of the process of cleaning the tank farms. Oil sludge residues obtained after the separation of sediment reservoirs, using a mobile cleaning systems, can be disposed by the specialized equipment for environmentally friendly technologies. The technological process of disposing of sludge by removing sediment oil and other hydrocarbons maximizes valuable oil product extract from the bottom sediments.

The main advantages of cleaning the tanks using a complex MKO-1000:

Specification of consumables, resources , and other to perform cleaning of a standard VST-20000 for the tank with an internal diameter of 47,4 m.

Pumping clean oil from the bottom sediments in the amount of 353 m3 takes about 10 hours (at the pump speed 37 m3/h).

Scour, pumping and phase separation of sludge takes time no more than 35 hours (productivity no more than 10 m3/h).

Time for cleaning, degassing, visual inspection and cleaning in the shielded areas of the tank takes 16 hours.

Total total time cleaning the tank with an internal diameter of 39,9 m is 60 hours or 8 working days (8-hour day).

Electricity is provided by energy module (diesel generator).

Thermal energy (steam, hot water) is provided by heat generating unit TGU-0,6MW, which used as a coolant oil insulated. TGU runs on diesel fuel.

  1. Diesel fuel, its consumption is determined by two consumer:
    • diesel power plant consumes 45 l/h (in continuous operation 6 hours per shift);
    • TGU—0.6MW consumes 40 l/h (running pulse is not more than 4 hours a day, with different modes of heating).
  2. Total overall consumption of diesel fuel per day is 430 liters .; 6 (8) days — 2580 liters. (3440 l.).
  3. Process water - single filling tanks with detegent — 35-40 m3.
  4. Technical detergent, at 2 percent concentration of the cleaning solution consumption of 800 kg. (single filling).
  5. Quicklime (modifier) for sludge processing — consumption of 25 tons.
  6. Rags, plastic garbage bags, sand, tools, etc.

Additional information about the calculated parameters.

Total (installed) (if all the energy devices of complex is on) power consumption of the MKO-1000 is 101 kW/h. In operating mode, power consumption is not more than 45 kW/h.

The technical detergent is a harmless chemicals of the 4th hazard class (lower class of danger). Its solution when its not required anymore, can be neutralized (for example with calcium chloride), and fused into an industrial sewer without damage to the environment.

In the process of the complex MKO-1000 used an aqueous solution of technical detergent "Vega CHM" ("Вега ЧМ") at a concentration of 1.5 - 2%.

On one filling of the MKO-1000 requires 120-180 kg of detergent. The solution is reusable. The solution can be used for a long time (an average of 50 cycles of a complete transfer and more, the state of the solution is determined by the uselessness of its washing performance). Water losses due to evaporation is negligible amount.

Oil sludge mixer:

Oily-water filtering device with performance 5m3/h:

Purification unit (using device with performance of 5 m3/h):

The purification unit work does not require permanent attendance. Work operator, mainly limited to control the accumulation of oil in bonds and sediment clogging of the filter, the timely organization of their removal and replacement.

When normal operation is provided by purification unit the surfactants are electro coagulated. To suppress the excess surfactant content in the treated water may require the introduction of additional coagulants.