Krasny Bor Industrial Water Contamination

The Krasnyi Bor dumpsite is a hazardous waste landfill site in Krasny Bor, Tosnensky District, Leningrad Oblast, Russia. The site is sometimes called the “chemical Chernobyl”, due to the two million tons of chemical waste accumulated there.

The Krasny Bor landfill is located about 30 km to the southeast of Saint Petersburg. The site, spanning 73 hectares (180 acres), was brought into use in 1970. Two million tons of waste in Krasnyi Bor are stored in pools, many of which have no cover. The area is surrounded by barbed wire, but outside the fencing, there is a channel, into which rainwater and waste collected.

With the rain and meltwater, poisons from the uncovered pools flow into this channel. The facility is formally under the authority of St. Petersburg. Next to the dumping site, there are two rivers, the Izhora River and the Tosna River, which empty into the Neva River.

The Baltic Marine Environment Protection Commission (HELCOM) has called it a particularly polluted area, which will present a serious threat to the Baltic Sea. If waters from the Krasnyi Bor pools should escape, or if the dykes should break, the hazardous waste will end up in the Gulf of Finland. In early March 2016, such a dyke did break, but the leak was detected and blocked up quickly.

Sodium ferrate can be used for the detoxification of toxic waters of the Krasny Bor landfill. Toxic waters from three acidic maps in non-flowing mode, storm drains from different points of the landfill bypass ditch in non-flow and flow modes.

Krasny Bor’s maps contain about 2 million tons of hazardous liquid industrial waste: oil and heavy metals, especially hazardous first-class waste such as mercury, cyanide, arsenic, and cadmium. The landfill is located in the basin of the Neva River, which flows into the Gulf of Finland.

Krasny Bor’s ecological problem is of an international level for the countries of the Baltic region: Russia, Finland, and Estonia. Water samples taken in 2016 by Helsingin Sanomat show that very hazardous substances from the maps seep out and are found in the forest outside the landfill (polychlorinated biphenyls and cadmium). Sodium ferrate is able to effectively decontaminate landfill maps and stormwater runoff from the landfill bypass ditch.

 

Stormwater treatment of the Krasny Bor landfill on the model of a complex water treatment plant using sodium ferrate

Wastewater treatment process parameters:

  • doses of ferrate and coagulants
  • the reaction time of oxidation and sedimentation
  • filtration conditions
  • the flow rate of purified water

Stormwater from the Krasny Bor landfill (light):

Sodium ferrate dose 9 mg/l + 10 mg aluminum oxychloride, reaction and precipitation time – 15 minutes, sorbent MS + AS, flow rate 0.4 l/min (24 l/h )

Storm sewer from building 115 (dark color):

Sodium ferrate dose 18 mg/l + 20 mg aluminum oxychloride, reaction and precipitation time – 15 minutes, sorbent MS + AS, flow rate 0.2 l/min (12 l/h)

Ferrate oxidation and precipitation filtration results of liquid toxic waste from the Krasny Bor landfill

The purification of industrial wastewater with sodium ferrate solution on stormwater and water of three acidic pads 59, 66, and 67 of the Krasny Bor landfill, St. Petersburg has been tested.

The MPC requirements for household wastewater were fulfilled on storm runoffs after oxidation with ferrate doses of 10-20 mg/l, on maps at 50-60 mg/l.

According to the 59th card, the decrease in total nitrogen from 480 to 48 mg / l, chlorides from 1500 to 520 mg/l, petroleum products from 0.43 to 0.05 mg / l; The pH increased from 4.0 to 9, and the water corresponds to the maximum permissible concentration for household wastewater.

In the water of 64 and 68 maps, the amount of Cd decreased by 2000 times, Pb – 100 times, i.e. up to the MPC requirements.

The results obtained showed the high efficiency of ferrate in the treatment of toxic wastewater.

Results of wastewater treatment with sodium ferrate

Initial water 59, 66 and 67 acid maps

After filtration through the Baltek sorbent

Filter cakes

After oxidation of 60 mg/l ferrate