CASE HISTORY

 Contract:

1) Tanks number K10A to F and numbers K9,22 & 23 had approximately 0.5 of metre of crude benzole residue in each of the tanks. The tanks were cleaned using the Chemiphase biological process in order to ensure the tank met the  typical“clean standards”.

2) Each tank was engineered to  have air pumped in on a continuous basis for good oxygenation and mixing. There was also sufficient stirring action on some of the tanks present.

3) Water extracted from the Local Fire hose system was used to fill all Tanks to approximately 2 Metres above the level of Solids, Additions of Oxidising agents were then added to oxidise all of the cyanide complexes present to the carboxylic group ions.  Once this was achieved a cleaning additive (CITRASOLV) was introduced to each of the tanks. The dosage rate for the Citrasolv product was approximately 2,500ppm.  Citrasolv is a citrus blend of biodegradable solvents with a fragrant aroma.  CITRASOLV will disperse most medium to heavy oil and tar compounds effectively.

4) Once the citrasolv product was added, each tank was re-circulated for 36 hours to allow the product to fully contact all surfaces and soak into all deposits present.

5) Each tank was then filled to approximately 50% of its total capacity using more water from the local river via the existing hydrant service.  Once filled each tank was then re-circulated. The re-circulation process was essential for it would avoid any solids settling in the tank, the circulation would transport all of the nutrients required to maintain a healthy environment for the bacteria species added and also it was a good method for ensuring the correct level of oxygen was present in order to support life i.e. allowed the biomass to be continually oxygenated.
Specialised strains of bacteria with the capability of degrading a variety of organic chemicals including Benzene, Toluene and Xylene were introduced. This process would then take between 2-4 weeks in-order to fully degrade all solids to the acceptable level. Each tank was then regularly tested until the optimum level of degradation achieved. 
The only deposits remaining in each of the tanks was a mixture of Iron Compounds and any heavy metals collected through the processes relating to Crude Coal processes.

6) Once each of the tanks was emptied. A final rinsing programme using fresh water along with the addition of our product Citrasolv was implemented.  All aqueous waters were  then collected.  Again a testing regime to monitor the effectiveness of the procedure was implemented.  This ensured all components of the treatment programme were maintained at the required levels to maximise treatment performance.

7) As the tanks were finally washed and drained of aqueous liquids each tank was then Gas checked prior to entry of personnel. 

8) Finally each tank was opened and the metal deposits were removed and placed into skips. This was then sampled and analysed to determine its composition. The analysis was sent to several land-fill sites for approval. Once approved, the material was loaded onto lorries for disposal to a licensed landfill site. 

Testing Procedures

Chemiphase  on-site personnel carried out all of the analytical tests at regular intervals and provided comprehensive reports on a regular basis.
Parameters analysed included:

pH, T.D.S, C.O.D. Oxygen. Cyanide, Methane, Total Sulphates, Phosphates, Biomass, D.O.U.R. (Measurement of Respiratory Rate for Bacteria), Total Organic Levels, B.T.X and Nutrient concentration.