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Case study: Rural areas characterised by the presence of small - - PowerPoint PPT Presentation
Case study: Rural areas characterised by the presence of small - - PowerPoint PPT Presentation
Case study: Rural areas characterised by the presence of small agglomerations (< 2000 p.e.) Pedro Toms Mrtn de la Vega Manzano Promedio , Diputacin Provincial de Badajoz Index 1.- The Province of Badajoz. Our Scenario.
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The province of Badajoz. Demography
Badajoz 684.113 inhabitants in 21,766 km2 165 municipalities Nº OF AGLOMERATIONS POPULATION % 2 > 50.000 30,5% 3 50.000 > 20.000 14,3% 4 20.000 > 10.000 8,4% 16 10.000 > 2.000 14,8% 140 < 2.000 31,9%
“THE WEIGHT OF THE SMALL AGLOMERATIONS IS TO
- HIGH. THESE MUNUCIPALITIES PRESENT A NEGATIVE
ANNUAL GROWTH RATE, HOWEVER A HIGH ESTACIONAL SUMMER POPULATION”
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The province of Badajoz. Climatology
Lenght of the drying period (month) Length of the warm period (month) Length of the cold period (month) The average temperatura in the coldest month (ºC) The average temperatture in the warmest month (ºC)
3 5 4 8 25
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The province of Badajoz. River Basin
“GUADIANA IS THE MAIN RIVER BASIN, AND GUADALQUIVIR IN THE SOUHT OF THE PROVINCE. TWO RIVER BASINS WITH TWO DIFFERENT CRITERIA TO ESTABLISH THE EMISSION LIMIT VALUES FOR THE URBAN WASTEWATER DISCHARGES”
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The province of Badajoz. Wastewater Characterization.
PROMEDIO MIN 0.00 500.00 1000.00 1500.00 2000.00 2500.00 3000.00 3500.00 4000.00 DBO5 DQO SST NH4 NTK NT PT
VALOR MEDIO DESVIACIÓN BOD5 (mg/l) 237.54 250.23 COD (mg/l 553.50 573.98 TSS (mg/l) 194.22 298.38 NH4 (mg/l) 69.23 32.84 NTK (mg/l) 75.39 37.69 TN (mg/l) 75.75 37.81 TP (mg/l) 7.98 4.04 (l/hab/d) 174.73 92.08
“small farms and small agro-food industries connected to the sewer system, which produces urban discharges with a high level of nitrogen”
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The province of Badajoz. Small WWTP Plan
Nº Aglomeration to provide WWTP Population Responsible administration 8 1000-2000 Autonomous Community of Extremedadura 91 <1000 Badajoz Provincial Council
“The main goal of the plan is to treat the urban wastewater discharges of all small aglomeration” “Facility Plan based on an aggrement between the Autonomous Community and the Badajoz Provincial Council”
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THE EMISSION LIMIT VALUE TO APPROPIATE TREATMENT IN OUR SCENARIO. TWO WAYS.
- 1. ACCORDING TO TABLE 1 AND 2 OF THE
- UWWTD. GUADALQUIVIR SCENARIO.
PARAMETER < 2.000 P.E. EXACTLY THE SAME TO > 10.000 P.E. IN SENSITIVE AREA BOD5
DAILY AVERAGE VALUE 25 MG/L O2 25 MG/L O2
COD
DAILY AVERAGE VALUE 125 MG/L O2 125 MG/L O2
TSS
DAILY AVERAGE VALUE 35 MG/L 35 MG/L
TN
ANNUAL AVERAGE VALUE 15 MG/L N 15 MG/L N
TP
ANNUAL AVERAGE VALUE 2 MG/L P 2 MG/L P
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THE EMISSION LIMIT VALUE TO APPROPIARTE TREATMENT.
- 2. ACCORDING
TO WFD WITH THE AIM OF ACHIEVING THE “GOOD STATUS” (GUADIANA SCENARIO). FOUR PARAMETERS ARE NECESSARY:
1. POPULATION EQUIVALENT. 2. DISTANCE BETWEEN THE DISCHARGE AND THE MAIN WATER BODY. 3. DISTANCE BETWEEN THE DISCHARGE AND THE DRINKING WATER RESOURCE TO INTRODUCE MORE STRINGENT REQUIREMENTS TO TP. 4. DISTANCE BETWEEN THE DISCHARGE AND THE BATHING WATER TO INTRODUCE REQUIREMENT ABOUT ENTEROCOCOS AND E. COLI.
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THE EMISSION LIMIT VALUE TO APPROPIARTE TREATMENT.
POPULATION EQUIVALENT [1.000-2000) [600-1000) [300-600) [100-300) < 100 EMISSION LIMIT VALUE DISTANCE FROM THE PRINCIPAL WATER BODY (Km) DISTANCE FROM THE PRINCIPAL WATER BODY (Km) DISTANCE FROM THE PRINCIPAL WATER BODY (Km) DISTANCE FROM THE PRINCIPAL WATER BODY (Km) DISTANCE FROM THE PRINCIPAL WATER BODY (Km) 0-1 1-5 5-10 >10 0-1 1-5 5-10 >10 0-1 1-5 5-10 >10 0-1 1-5 5-10 >10 0-1 1-5 5-10 >10 BOD5 (mg/l) 20 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 30 35 40 COD (mg/l) 100 125 125 125 125 125 125 125 125 125 125 125 125 125 125 125 125 135 145 155 TOTAL SUSPENDED SOLID (mg/l) 25 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 45 55 65 NH4 (mg/l) 4 6 8 10 5 7 9 11 6 8 10 12 8 10 12 14 10 12 14 16 TN (mg/l) 15 20 25 30 18 23 28
- 20
25 30
- 25
30
- 30
- TP - DAILY MAX. VALUE
(mg/l) 5 6 7 8 5,5 6,5 7,5
- 6
7 8
- 7
8
- 8
- TP -DAILY AVERAGE
VALUE (mg/l) 3 4 5 6 3,5 4,5 5,5
- 4
5 6
- 5
6
- 6
- TP- ANNUAL AVERAGE
VALUE (mg/l) 1,5 2 3 4 2 2,5 3,5
- 2,5
3 4
- 3,5
4
- 4
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Wastewater technologies to achieve the Emission Limit Values
SEQUENCIAL BATCH REACTOR ARTIFICIAL WETLAND WITH HIDROLITIC ANAEROBIC DIGESTOR TO REMOVE NITROGEN ROTATING BIOLOGICAL CONTACTOR COMPACT EXTENDED AERATION
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How to establish the appropiate traetment?
Normal urban discharge Loaded urban discharge
LIMIT EMISSION VALUE OF WAY 1 LIMIT EMISSION VALUE OF WAY 2 LIMIT EMISSION VALUE OF WAY 1 LIMIT EMISSION VALUE OF WAY 2
SPACE AVAILABILITY NON- SPACE AVAILABILITY SPACE AVAILABILITY NON- SPACE AVAILABILITY SPACE AVAILABILITY NON- SPACE AVAILABILITY SPACE AVAILABILITY NON- SPACE AVAILABILITY
< 100 AD+VSSF ST or AD+RBC AD+VSSF +HSSW AD+RBC AD+VSSF +HSSW ST or AD+RBC AD+VSSF +HSSW EA 100-300 AD+VSSF AD+FBA
- r
AD+RBC AD+VSSF +HSSW AD+FBA
- r
DA+RBC AD+VSSF +HSSW AD+FBA
- r
AD+RBC AD+FBA EA 300-600 AD+VSSF AD+FBA
- r
AD+RBC AD+VSSF +HSSW AD+FBA
- r
AD+RBC AD+VSSF +HSSW AD+FBA
- r
AD+RBC AD+FBA EA 600- 1.000 AD+VSSF +HSSW AD+FBA Or AD+RBC AD+VSSF +HSSW AD+FBA
- r
AD+RBC AD+VSSF +HSSW AD+FBA
- r
AD+RBC
SBR+HSSW
SBR > 1.000 AD+FBA AD+RBC A+FBA AD+RBC AD+FBA AD+RBC
SBR+HSSW
SBR
AD: Anaerobic Digestion VSSF: Vertical Subsurface Flow Constructed Wetland HSSF: Horizontal Subsurface Flow Constructed Wetland ST: Septic Tank RBC: Rotating Biological Contactor FBA: Forced Bed Aeration EA: Compact Extended Aeration SBR: Sequencial Batch Reactor
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Challanges ahead
High investment to renew the sewer system. Control of the small industrial discharges (small farm and small agri-food industries) Desing the small WWTP according to the management criteria.
Telecontrol is fundamental. Technologies with low energy consumption. Photovoltaic energy as energy supply Shared Waste sludge management
Keep the Promedio Model based on economy of scale.
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