Water for a big city
SUE “Vodokanal of St. Petersburg” provides drinking water to 5 million citizens and tens of thousands of companies and enterprises. One more task of Vodokanal is to collect and treat wastewater.
Since 2013, endangered pinnipeds - grey seals and (Baltic and Ladoga) ringed seals- have been rehabilitated at the premises of Repino wastewater treatment plant in the Kurortny District of St. Petersburg.
10 October 2013, the biggest environmental project – the Northern Tunnel Collector construction – was completed
Since June 28, 2011 Saint-Petersburg has been fully implementing the Helsinki Commission's recommendations for preservation of the Baltic Sea
Last weekend, the permanent snow-melting stations (PSMS) and permanent technically equipped snow collection points (PTESCP) in St. Petersburg kept receiving snow and setting records. Saturday, 16 January was the most snowy day in the history of PSMS operation: in one day, from Saturday 8:00 to Sunday 8:00, Vodokanal’s snow-melting stations received 46,756.5 m3 of snow from the city streets. The previous absolute record was set on 15 January (44,420 m3 of snow) and surpassed just two days later.
All in all, almost 128,752 m3 of snow have been melted at the permanent stations over three days, Friday to Sunday: on Friday, 15 January - 39,952.2 m3; on Saturday, 16 January – 46,756.5 m3; on Sunday, 17 January – 42,043 m3.
It should be reminded that the total capacity of 10 PSMSs operating in St. Petersburg is 59,000 m3/day of snow.
On Saturday, 16 January, many of Vodokanal’s snow-melting stations were doing an especially arduous work having received snow volumes in excess of their design capacity.
For example, the PSMS in Krasnoputilovskaya st. having the design capacity of 3,500 m3/day could melt 5,626 m3 of snow on the most snowy day. Likewise, the PSMS in Kushelevskaya Road processed 6,228 m3 of snow (its design capacity being 5,000 m3/day). Despite such workloads, snow from Petersburg streets is received in full and, if necessary, is placed on temporary snow storage areas at PSMS site.
On Saturday, 16 January, the snow reception leaders were the stations in Mebelnaya st. (7,144 m3 of snow) and in 2, Oktyabrskaya emb. (7,204 m3). By the way, the PSMS in Oktyabrskaya emb. is an absolute leader in received snow volumes: as many as 49,790 m3 of snow have been melted there by now.
Vodokanal’s permanent technically equipped snow collection points (PTESCP) have also set their new record. The biggest volume of snow was delivered to them on Friday: 11,581.9 m3 of snow in one day, from 15 January 8:00 to 16 January 8.00. On Saturday, the PTESCPs received 10,857.5 m3, on Sunday – 9,508 m3.
In total, both PSMSs and PTESCPs have received 160,699 m3 of snow on Friday, Saturday and Sunday together.
It should be reminded that in the winter season 2015-2016 Vodokanal is operating 10 PSMSs and 6 PTESCPs to receive, measure and dispose snow. It is only in this season that the PTESCPs were placed under the control of Vodokanal (previously, PTESCP operation had not been within the scope of the company).
Both snow-melting stations and snow collection points work around-the-clock.
There is a fundamental difference between PSMS and PTESCP.
The principle of PSMS operation is as follows: the heat of wastewaters melts the snow fed to the inlet chambers. Even in winter, wastewater temperature is about 16°C. The resulting melt water is diverted, together with sewage, via collectors to wastewater treatment plants where it undergoes a full treatment cycle.
The PTESCPs are intended to receive, store and dispose the snow and snow-ice mix swept from the streets in Petersburg. At PTESCPs snow is melted either naturally (e.g. by the warmth of the sun), or in mobile snow-melting plants. Melt water from PTESCPs is treated at local treatment plants and diverted to the sewerage system and then to WWTPs. The total design capacity of six PTESCPs is approx. 382,000 m3 per season.
Since the start of the season (23.11.2015), 346,152.5 m3 of snow have been delivered to Vodokanal’s “snow stations” (285,630.1 m3 were processed at PSMSs and 60,522.4 m3 were received by PTESCPs).