The objective of the assignment is to carry out recipient studies of the fjord systems around Bergen. The water regulations sets requirements that the water source shall have a good ecological status. The municipalities around Bergen are facilitating that the sewage treatment should be on a level that safeguards this requirement.
The discharge permit for municipal sewage water, sets requirements for recipient studies. The recipient studies shall map what possible influence the sewage water has on the water sources, and ensure regular monitoring of the water sources that are affected by sewage water. Comprehensive recipient studies of the fjord systems around Bergen have been carried out from 1973, in 5 year periods up until now. The last study was carried out in the period 2011-2015.
The objective of the assignment is 3 fold:
A) Secondary treatment plan for Bergen kommune:
Carry out recipient studies outside of the 4 treatment plants (Kvernevik, Ytre Sandviken, Holen and Flesland) that are upgraded to secondary treatment. 3 of the plants are open and undergoing commissioning. The last plant will undergo commissioning during autumn 2016. In addition, recipient studies shall be carried out outside of Garnes treatment plant (grate) that is planned for upgrading to secondary treatment.
The objective is to be able to document the expansion of the discharges from the sewage treatment plants, and to be able to demonstrate the changes before the development, during the development and after the upgrading of the treatment plants is completed.
B) Existing plants, Bergen kommune:
Carry out recipient studies outside of 8 other small treatment plants (multi-stage grates). A pre-study shall be carried out in the recipient, possibly establishment of new base stations near the existing discharge. In the next few years it shall be decided which plants shall be upgraded, and if new facilities shall be built, or if the sewage water shall be transferred to the existing upgraded treatment plants.
C) Studies in other municipalities:
Askøy kommune: Studies shall be carried out outside of the 5 existing treatment plants. The studies shall document what affect is in the near vicinity and on the recipient as a whole. In addition, it will be considered whether to take more tests outside of the new treatment plant Sahara, possibly to create new stations in connection with new discharge pipes from Sahara.
Os kommune: Studies shall be carried out in the recipients outside 3 to 4 treatment plants, depending on the progress of the new Ohara treatment plant. The studies shall document what affect is in the near vicinity and on the recipient as a whole. It must be determined if it is necessary to set up new stations in connection with new discharge pipes from Ohara.
Sund kommune: Studies shall be carried out of 3 recipients outside of municipal sewage treatment plants. The studies shall document what affect is in the near vicinity and on the recipient as a whole.
It may be necessary to include several municipalities in the area during the study.
More detailed information and details of the assignment will be in the tender documentation.
A study program has been prepared, planned over 4 years with start up in January 2017. The program is based on previous studies from 1973 up until now.
The studies shall be carried out in-line with the program that exists for the study, along with the applicable version of TA-1890.