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03.04.2019
Variations in industrial wastewater composition at inflow of Riga wastewater
treatment plant «Daugavgriva», Latvia
Information about SIA «Rīgas ūdens» 2018
• Riga city service territory 307 km2
• Riga citizens 677 295
connected to town water&sewage network 619 703
PE - 701 534
• Clients – 15 000
• Drinking water supply 39,147 million/m3
• Treated wastewater 47,540 million /m3
• Financial turnover 45,6 million /EUR
• Employees 772
Numbers and Facts
Planned activities of the Projectin Berģi, Imanta and Beberbeķi:
• New Sewerage network 34,59 km;• Sewer network reconstruction 0,44 km,• 18 new Sewerage Pumping Stations.
In addition to 2014-2020 period planned activities of 24,73 km new centralized water supply networks will be built and 0,41 km reconstructed (financed as project non-related expenses). Planned project period is 69 months with the deadline on 31th December in 2023
Project «Development of Water Management in Riga, 5th stage» 2018 – 2019
EU co-financed projects
Project funding26, 07 million/EURIncluding Cohesion fund cofunding9, 93 million/EUR
Main investments in drinking water and sewer networks
Investment type 2016 2017 2018
Water network rehabilitation ~ 0,9 km ~ 8,2 km ~ 3,6 km
Gravity sewer rehabilitation ~ 3,4 km ~ 10,7 km ~ 9,9 km
Pressure sewer rehabilitation 0 km ~ 1 km ~ 8,9 km
Fire hydrants replaced 510 483 472
Valves replaced (DN≥100 mm) 1447 1133 1010
Investments
01.12.2017.
1 416 km water supply network
15 water pumping stations
Riga city Centralized water supply system scheme in 2019
RĪGA
Water supply network Water Supply
Daugava
Zaķumuiža
Remberģi
Baltezers
Baltezers-1
Baltezers-2
WWTP “Daugavgriva” (1991)PE 750 000 to 1 million
Average flow 150 000 m3/day
26.03.2019
WWTP “Daugavgrīva”
Key Performance Indicators(2018)
9
47 540 576 m3 of treated wastewater
40 865 t of sludge production
Treated wastewater costs
0,33 EUR/m3
WWTP “Daugavgrīva”
17
1 19
9 22
1
21
4
22
7 27
3
26
4
27
7
27
7
28
0
26
0
25
8 31
1
26
8
25
0 29
7
30
5 33
2
33
3 38
5
32
16 19
15 18 23 33
21
16 3
5
11
7 7 9 9 14
13
7 8.7
8.5
0
50
100
150
200
250
300
350
400
19
99
20
00
20
01
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02
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03
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20
17
20
18
mg/
l
Riga WWTP "Daugavgriva" SS concentration
14
5 19
9
18
9 20
8 23
2 24
9
24
4
25
7
26
0 29
3
29
8
27
3
25
5
24
8 26
6
27
3
28
2
27
5
27
8
32
3
12
.2
9.8 10
.4
10
.5
10
.6
16
.0
21
.8
13
.6
16
.6
17
.8
7.9
6.9 7.3 10
.9
9.9 10
.6
10
.2
8.5 9.6
8.7
0
50
100
150
200
250
300
350
400
19
99
20
00
20
01
20
02
20
03
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04
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07
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17
20
18
mg/
l
Riga WWTP "Daugavgriva" BOD5 concentration
6.3
7.6
2
7.6
7.3 7
.8 8.6
8.6 8.8
7.8 8
.4 8.8
7.8
9.4
7.5
7.5
7.5 8
.1
8.0
7.9
8 8.9
2
3.2
2.8
8
3.3
3.2
2.6 2.9 3
.6
2.7 2.9
2.5
1.0
0.7
0.6 1
.2
0.9 1.1 1.1
5
0.8
0.7
2
0.6
7
0
1
2
3
4
5
6
7
8
9
10
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
20
15
20
16
20
17
20
18
mg/
l
Riga WWTP "Daugavgriva" P tot. concentration
30.0
36.9 41
.6
43.5 50
.1
52.1
49.4 54
.3
51.9 55
.2 57.7
55.0 58
.8
53.8
52.0 55
.9
57.6
50.2 55
.1
65.3
0
15.6 21
.1
22.4
22.2
30.5
24.2 27
.7
38.5
39.4
40.6
22.4
18.6 21
.0
20.2
11.2
9.0
8.9
8.9
7.05
7.22
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
19
99
20
00
20
01
20
02
20
03
20
04
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05
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06
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08
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10
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18
mg/
l
11
WWTP “Daugavgrīva”
0
10000000
20000000
30000000
40000000
50000000
60000000
19
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01
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m3
Treated effluent volume (mln.m3) 1999-2018
Production of biogas 1999-2018 (mln.m3) Treatment efficiency %
WWTP “Daugavgrīva”
Production of sludge 1999-2018 (tonns)
29
WWTP “Daugavgrīva”
Riga Water wastewater treatment WWTP Daugavgriva performance data 2018
Parameter
Average concentrations inlet to WWTP
2017
(mg/l)
Average concentrations
effluent
2017
(mg/l)
Latvian regulation
Nr.34
(mg/l)
Pollution
load to Baltic sea
(tons/year)
N tot. 65,3 7,22 10 344
P tot. 8,92 0,67 1 31
BOD5 323,1 8,7 25 415
SS 385,1 8,5 35 40520
WWTP “Daugavgrīva”
01.12.2017.
Notekūdeņu savākšana un attīrīšana
Riga city Centralized Sewage system in 2019
1 143 km Sewagenetwork
85 Sewage Pumping stations
Wastewater network Wastewater treatment and collection
RĪGAWWTP Daugavgrīva
KSS 307
KSS 311KSS 106
PollutionMaximum permissible concentration (MPC) mg/l
SS 450,00
COD 700,00
N tot 46,00
P tot 9,00
Extractable substances 40,00
Oil products 4,00
Surface active agents 5,00
Cr 0,40
Ni 0,40
Zn 0,30
Cu 0,20
As 0,02
Pb 0,20
Hg 0,01
Phenols 0,1
Formaldehyde 0,5
Cd 0,01
Legislation Riga City Council Binding Regulations No.17Binding regulations of operation, use and protection of Riga city centralized water supply and sewerage system
Types of monitoring used by Riga Water:
Ambient monitoring (existing…)• Status and trend detection• Testing of wastewater pollutants• Calculation of loads
Effluent monitoring WWTP Daugavgriva (existin….)• Calculation and control of discharge standards• Monitoring of plant performance
Operational monitoring WWTP Daugavgriva (existing…)Monitoring for operation of wastewater treatment works.
Early warning (Riga sewage network/WWTP-developing 2017/2019)
14
Simple monitoringbased on a limited number of samples, simple analysis or observations, and obtained data treatment (.....excel)
Intermediate-level monitoringrequiring more variables, stations, and specific laboratory equipment and PCs/software for data handling
Advanced level monitoringinvolving sophisticated techniques and highly trained technicians and engineers for sample analysis and data handling, often using mainframe computer systems.
Riga Water levels of wastewater pollution monitoring (where we are….)
15
Intermediate-level monitoring (on-line)More variables - TSS, COD, BOD, TOC, DOC, NH4-N, NO3-N, TDS, Conductivity, pH, temperature - inlet chamber WWTP Daugavgriva, main pumping stations (3-4) and specific laboratory equipment and PCs/software for data handling, via online....
Advanced level monitoring (2018 -2020)Involving sophisticated techniques (on-line data from town sewage network) and highly trained technicians and engineers for sample analysis and data handling, using mainframe computer systems.
Wastewater Network Modeling and Analysis Solution
CAPABILITIES:
Analyze hydraulic performance of flow rate > dilution of pollutants. Use a hydraulic model and wastewater GIS.
Analyze hydrogen sulfide formation
Determine sewer overflow risk
Identify areas of inflow and infiltration
Simulate wastewater concentration
Nitrification works with two groups of nitrifying bacteria, AOB (ammonia oxidizing bacteria) and NOB (Nitrite oxidizing bacteria), are sensitive to booths substrate of their own and each other. Antohnisenet.al. 1976. They are autotrophic, as they oxidize inorganic nitrogen and use it as an energy source.
Inhibition
Situation today:
SUMMARY:
1. Industrial wastewater monitoring programm via check list/investigation relates to Eco toxicity (OSPAR, EU Toxicology of Chemicals report No. 80 – ECETOC 2001);
2. Nitrification inhibition definition for monitoring points (Inhibition index - for sewage network& WWTP Daugavgriva - Inhibition %) accordingly to EN ISO 9509:2006. Water quality – Toxicity test for assessing the inhibition of nitrification of activated sludge
microorganisms. Inhibition index (Inh1i=MECmax /PECLD50), when <1 no environmental
risk?
• Analysis of Free Ammonia - Inhibition of Nitrite Oxidizing Bacteria (RTU, UITK 2018-2019); AOB, NOB?
3. Wastewater Network Modeling and Analysis Solution (Bentley®) Dilution rate?
4. Early warning «on line» information system for shock loads and toxic substances.
Thank you for your attention!
