Clariant Oil Services Successfully Inhibits Growth of Bacteria in Slop Tank
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Clariant Oil Services Successfully Inhibits Growth of Bacteria in Slop ...

Case History

Clariant Oil Services Successfully Inhibits

Growth of Bacteria in Slop Tank

BIOTREAT 4617 and BIOTREAT 4906 outperform incumbent in Brazilian Field


• Retained H2S limits goal

• Neither biocide crystallized in contact with the external environment

• Significant decrease in the amount of product required to treat the slop tanks (based on initial test levels)

• Reduction in treatment frequency, from every 10 days to every 20 days

• No change to the treated water pH


A treatment platform was using two biocides from a competitor company to treat bacteria problems; the incumbent’s approach was proving unsuccessful. To

reach the goals established by the operator, Clariant Oil Services proposed the use of two biocides to restrain and then inhibit any growth of H2S generating

bacteria. The test was to inject BIOTREAT 4617 and BIOTREAT 4906 in the aqueous phase of the separation and slop tanks, keeping a pre-determined dosage

of 150 ppm BIOTREAT 4617 and 75 ppm BIOTREAT 4906; the tank should remain with a residual 150 ppm of BIOTREAT 4617. The tables below show the

platform characteristics and treatment data.

Table 1: Platform Characteristics

Platform Type Platform FSO

Blade Water

800 meters

Injection System Surface

Injection Points - Water input of 4 separation tanks

- Head of the 2 slop tanks

Table 2: Treatment Data

Oil Importation P-18, P-19, P-20 and P-27

Oil Treatment 366 m 3 /h

Water Disposal 350 m 3 /h

Export BS&W

Figure 1: Tank 2ABB

Figure 2: Tank 2ABE

Figure 3: Tank 4BE

Additionally, BIOTREAT 4617 and BIOTREAT 4906 demonstrated great efficiency in the process facility, in spite of some adverse conditions, including:

• Scraping of other load tanks to the treated tanks

• Difficulty in keeping the medium under agitation after dosage for more than 2 hours

• Narrow lines for chemical injection

• Lack of reagents for residual titration of BIOTREAT 4617

• Varying amounts of water to be treated, and in-loading reception

Clariant Oil Services

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