Oil industry

Treatment of bottom sediment and produced water

Description Reagents and equipment Implemented projects Other solutions

Produced waters are a mixture of formation water and water injected in reservoir pressure maintenance system separated from the well production in the process of their conditioning, and water which is injected in reservoir pressure maintenance system.

Three common challenges often occur during treatment of produced water:

• Low efficiency of existing bottom settlement and produced water treatment technologies (concentration of petroleum products after treatment is 60-70 mg/l against required 50 mg/l max.)

• High CAPEX and OPEX incurred in terms of existing treatment technologies.

• Negative impact of Oil ad Gas Complex industries on environment.

Standard oil field water parameters

Parameter	From	Up to
Petroleum products	100 mg/l	5000 mg/l
Temperature	5ºС	90ºС
Hydrogen Sulphide	0 mg/l	500 mg/l
рН	5	8

Key process indicators after introduction

Parameter	Spilltex® membrane	Biomicrogel® BMG-C2
Petroleum products	<40 mg/l	1-10 mg/l
рН	6.5-8.5	6.5-8.5

Wastewater treatment option with flotation plant

Oily waste water is fed into a pipe flocculator for chemical treatment by solutions of coagulant, flocculant Biomicrogel® BMG-C2 or coagulant Biomicrogel® BMG-P2 and flocculant based on polyacrylamide. The water treated by chemicals passes through a pipe flocculator for better mixing and distribution of chemicals in the waste water volume. As a result of the chemical dosing, oil products are bound and poorly soluble particles are formed. Further, the wastewater is sent to the flotation unit, where the pollutants as a flotation foam are removed due to the physicochemical treatment. The treated waste water is discharged by gravity from the flotation unit, and the separated flotation foam is fed to the screw-press for dewatering.

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Example of a wastewater treatment scheme with a reactor

The technological scheme for the oily waste water treatment provides its accumulation and sequential processing in the separation reactor by solutions of the coagulant Biomiсrogel®BMG-P2, coagulant and flocculant based on polyacrylamide. As a result of the chemical dosing and mixing, oil products are bound and poorly soluble particles are formed. After the settling, the formed sludge goes to a belt filter for filtering, and the treated waste water is discharged by gravity.

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Reagents Equipment

Biomicrogel® Flocculant BMG-С2 Biomicrogel® Coagulant BMG⁠⁠-⁠⁠P2

Spilltex® filter cloth

How it works Preparation Transportation and Storage Disposal Documents

Biomicrogel^® BMG-C2 flocculants are highly compatible with almost all flocculants based on inorganic salts of polyvalent metals. They are suitable for cleaning water from any types of lubricants, oil, and petroleum products.

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Delivery options

The Biomicrogel^® BMG-C2 flocculant is available as solution, which is ready for proportioning.

Biomicrogel^® BMG-C2 flocculants in solution form are supplied in 1000 liter IBC containers.

Biomicrogel^® BMG-C2 flocculants paste form are supplied in 19 kg plastic buckets or in 220-liter barrels as requested by the customer.

Store the product in a cool and dry place. Keep the entire protective packaging safe before using the product.

To avoid hydrolysis or an increase in microbial counts or fungi, resulting in its deterioration, use the Biomicrogel^® BMG-C2 flocculant treatment solution within 60 days after its preparation. The guaranteed storage life in dry form is 12 months from the date of manufacture.

After precipitation from water Biomicrogel^® flocculant BMG-С2 shall be disposed of in accordance with effective legislation.

The following FCCW Code is applicable: 7 23 301 02 39 4: “The sediment (sewage sludge) from the flotation treatment of oily wastewaters, containing less than 15% of petroleum products”.

Laboratory testing of the treatment of produced wastewaters from oil refineries indicated that the sediment containing the Biomicrogel^® BMG-C2 flocculant can be disposed of by means of supplying it to the start of the water treatment cycle (primary separator). The findings of this lab test indicated that the oil quality will not change significantly and will remain within the regulated maximum permissible concentrations.