Sustainability

Discharge of treated wastewater

KPO uses special man-made facilities for collecting treated domestic and industrial wastewater and storm runoffs. These facilities exclude a possibility of contaminants soaking into the soil and reaching groundwater as well as allow collecting the treated wastewater for their re-use for technical needs, thereby reducing the fresh water intake.

KPO wastewater collection facilities

Formation water, produced with crude hydrocarbons, and process wastewater are treated and injected into the deep-lying formations of the KOGCF industrial wastewater burial sites 1 and 2. Wastewater injection is the international practice of disposing wastewater, avoiding the formation of salt-containing waste on the surface during the treatment. Due to the reliable water shutoff and soil properties, which are ideal for the injection of wastewater, the migration of wastewater into upper aquifers is ruled out. According to the RoQ legislation, the volume of discharged wastewater and amount of discharged contaminants are regulated by the special permits.

Wastewater generated as a result of the KPO economic and production activities is not discharged into the natural water bodies.

Table below shows the KPO discharge volumes in 2018-2020 by wastewater types and receiving facilities.

Total discharge volume and contaminants by wastewater types and receiving facility, 2018 - 2020, m3

Receiving facility

Type of wastewater

2018

2019

2020

Discharge volumes, m3

Amount of contaminants, tonnes

Discharge volumes, m3

Amount of contaminants, tonnes

Discharge volumes, m3

Amount of contaminants, tonnes

Holding ponds

Treated domestic wastewater

68,752

38.8

68,763

35.72

64,244

34.38

Subsurface Waste Water Disposal Polygons

Industrial wastewater, process and produced wastewater

663,706

42,240

628,819

39,645

694,893

45,970

Terrain of Bolshoi Chagan OPS and Atyrau Terminal OPS

Rainfall and snow melt wastewater

2,694

1.51

3,546

2.05

1,982

1.56

Total discharge

735,152

42,280

701,128

39,683

761,119

46,006

Comparing to 2019, the volume of wastewater discharged by Company in 2020 increased by 8.6%. Of that, in 2020, the volume of injected industrial wastewater increased by 10.5% as compared to 2019. The increase in industrial wastewater was due to increase of produced water.

KPO monitors the content of contaminants in generated and treated wastewater at its facilities, such as:

In 2020, the discharge of contaminants amounted to 46,006 tonnes (which was 15.9% more compared to 2019 - 39,683 tonnes). Of them, 45,961 tonnes were discharged within the maximum permissible discharge (MPD) limits, while the excess discharge amounted to 45 tonnes.

Excessive discharge of contaminants was due to insignificant exceedance of the annual MPD limits in terms of sulphide content in wastewater injected into Subsurface Waste Water Disposal Polygons № 1 and № 2. Excessive discharge of contaminants with domestic wastewater to the holding ponds was not observed. As provided by the RoQ Tax Legislation, the Company effected necessary payments for the discharges of contaminants.

In general, wastewater injection has no effect on the environmental components such as soil, flora and fauna, as wastewater is injected into effectively isolated deep horizons with high-mineralized groundwater that is not used for domestic and potable, balneological, process needs, irrigation or livestock farming.