Project expert dr. D. Jakimavičius. Kaunas, LEI

Transcription

1 Project expert dr. D. Jakimavičius Kaunas, LEI

2 odata COLLECTION EXPEDITIONARY RESEARCH oinformation about hot spots; oinformation about river (length, width and depth; discharge; background and downstream concentration); oinformation about discharger (discharge of wastewater, diameter of discharger, concentrations of pollutants); oadditional information (EQS, MAC, river channel characteristics). ocalibration OF DISCHARGE TEST otest application for Skuodas WWTP (using expeditionary data); o Results of the Discharge Test calibration.

3 olocation of the selected hot spots

4 oskuodas city WWTP was reconstructed in The capacity of the WWTP is 1270 m 3 /d. The treatment wastewater discharger (discharger no ) of WWTP is located on the left bank of the river Bartuva. Treatment plant discharger pipe in river Bartuva is 400 meters away from wastewater treatment plant.

5 omažeikiai city WWTP started to work in The capacity of WWTP is m 3 /d, equipments cover 5.52 ha area. Sewage sludge disposal facilities were constructed in The treatment wastewater discharger is on the right bank of the Venta River and 80 m away from the treatment plant.

6 oa new wastewater treatment plant was constructed in Naujoji Akmenė in July Productivity of the N. Akmenė city biological WWTP is 2880 m 3 /d. The treatment wastewater discharger is located 10 m away from the boundary area.

7 oakmenė city WWTP was constructed in autumn of Productivity of this biological WWTP is 1038 m 3 /d. The treatment wastewater discharger is 330 m away from the treatment plant territory.

8 oriver length, width and depth Distance from the monitoring place to the mouth (river length) was determined according to the monograph: The Lithuanian rivers. Hydrography and runoff. River width and depth was measured during the expedition.

9 oriver width and depth measurement The largest length of this geodesic tape-measure is 100 m and minimal interval of the scale is 1 cm.

10 owe made the cross-sections of the rivers, where river width was graduated with interval of 1 m and river depth with interval of 0.5 m. Cross-sections of the river (verticals of the measurement velocity are marked as the blue line): a) Venta; b) Bartuva; c) Agluona; d) Dabikinė

11 o The area velocity method was used for estimating the discharge of the rivers. where Q discharge (m 3 /s), v water flow velocity (m/s), A cross-sectional area (m 2 ), H depth, m.

12 o Current meter with signal decoding device (which converts spin signal to flow velocity (m/s)) was used for the measurement of the flow velocity. Current meter (VG 1 120) can be used in the water, which temperature is 0 30 С, mineralization g/m 3, turbidity g/m 3.

13 o Measurement of flow velocity, depth and width of riverbed is given in Table. Discharges of all selected rivers were calculated by the measurement data.

14 o Samples were taken from river: downstream and upstream wastewater discharge pipes.

15 o Discharges of the wastewater were measured according to capacity volume method. where Q discharge (m 3 /s), W water volume in container (m 3 ), t time (s), which takes for water to get into container; it means that discharge can be measured directly.

16 o Information about the diameter of discharger was received from treatment plants administrations. Samples (to estimate concentrations of pollutants) were taken from wastewater discharge pipes.

17 oeqs (Environmental quality standard) values are provided in directives and in River basin management plans.

18 omac (maximum available concentration) are provided in Wastewater Management Regulation. MAC still can be determined for each individual polluters.

19 ocharacteristics of the channel (straight or wavy, bed with or without rocks, deep or shallow, overgrown with aquatic vegetation or not) were evaluated by visual assessment of the river.

20 INPUT DATA SURFACE WATER river canal ditch or small canal lake flow Q opp m3/s depth h 4 m width b 50 m River: Discharge: 0.8 m 3 /s C W : 640 µg/l Width: 10.3 m Depth: m Discharger : Wastewater discharge: 44.77m 3 /h C Discharger : 9390 µg/l Discharger diameter: 0.6 m upstreamconc. C w µg/l 103 L = 500 m Criteria: MAC: EQS: µg/l 3000 µg/l 10 x river width

21 existing Existing discharge discharge reduced discharge INPUT DATA DISCHARGE LIST OF SUBSTANCES flow Q discharge 1.5 m3/hr diameter pipe D m substance Substance X effluent concentration C e µg/l Heptachlorine Heptachloroepoxide Chloordaan total Phosphate total Nitrogen Substance X X alachlor River: Discharge: 0.8 m 3 /s C W : 640 µg/l Width: 10.3 m Depth: m MAC x = MAC = µg/l EQS x = EQS = µg/l NR x = NR = µg/l X = 0.04 % Substance X = M 25 = 9 Discharger : Wastewater discharge: 44.77m 3 /h C Discharger : 9390 µg/l Discharger diameter: 0.6 m Criteria: MAC: µg/l EQS: 3000 µg/l

22 BOTTOM ROUGHNESS FOR SPECIFIC WATERS Do you want to use specific values for bottom roughness (Y/N)? y n TYPE OF CHANNELS AND DESCRIPTION Natural streams - minor streams (top width at floodstage < 100 ft) 1. MAIN CHANNELS a. clean, straight, full stage, no rifts or deep pools b. same as above, but more stones and weeds c. clean, winding, some pools and shoals d. same as above, but some weeds and stones e. same as above, lower stages, more ineffective slopes and sections f. same as "d" with more stones g. sluggish reaches, weedy, deep pools h. very weedy reaches, deep pools, or floodways with heavy stand of timber and underbrush 2. MOUNTAIN STREAMS, NO VEGETATION IN CHANNEL, BANKS USUALLY STEEP, TREES AND BRUSH ALONG BANKS SUBMERGED AT HIGH STAGES a. bottom: gravels, cobbles, and few boulders b. bottom: cobbles with large boulders What type of water are we dealing with (type 1 or 2)? 12 In what category does the water fall? (type a,b,c,d,e,f,g or h) e b Manning roughness constant Influence on the mixing

23 930 C C = 930 µg/l C M = 960 µg/l

24 o Comparison of the measured and calculated values of the pollutants concentrations (μg/l) at the ends of the mixing zones. C meas measured concentration; C calc calculated concentration; % - difference between M and C in percents. The empty cells are for the chemical elements, the measured concentrations of which were less than method detection limit.

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