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 Tomás Mártín de la Vega Manzano Promedio , Diputación Provincial de Badajoz

Index  1.- The Province of Badajoz. Our Scenario.  2.- WFD or UWWTD to establish ELV.  3.- Technologies to treat all the discharges of small aglomeration.  4.- How to establish the aproppriate treatment?  5.- Our challange about small WWTP.

The province of Badajoz. Demography 684.113 inhabitants in Badajoz 165 municipalities 21,766 km2 Nº OF % POPULATION AGLOMERATIONS > 50.000 30,5% 2 14,3% 3 50.000 > 20.000 8,4% 4 20.000 > 10.000 10.000 > 2 .000 14,8% 16 31,9% < 2 .000 140 “ THE WEIGHT OF THE SMALL AGLOMERATIONS IS TO HIGH. THESE MUNUCIPALITIES PRESENT A NEGATIVE ANNUAL GROWTH RATE, HOWEVER A HIGH ESTACIONAL SUMMER POPULATION ”

The province of Badajoz. Climatology The average The average Lenght of the Length of the Length of the temperatture temperatura drying period warm period cold period in the in the coldest (month) (month) (month) warmest month (ºC) month (ºC) 3 5 4 8 25

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 ”

The province of Badajoz. Wastewater Characterization. VALOR 4000.00 DESVIACIÓN MEDIO 3500.00 3000.00 BOD5 (mg/l) 237.54 250.23 2500.00 COD (mg/l 553.50 573.98 2000.00 TSS (mg/l) 194.22 298.38 1500.00 NH4 (mg/l) 69.23 32.84 1000.00 NTK (mg/l) 75.39 37.69 500.00 0.00 MIN TN (mg/l) 75.75 37.81 DBO5 DQO TP (mg/l) 7.98 4.04 SST PROMEDIO NH4 NTK (l/hab/d) 174.73 92.08 NT PT “ small farms and small agro-food industries connected to the sewer system, which produces urban discharges with a high level of nitrogen ”

The province of Badajoz. Small WWTP Plan “ Facility Plan based on an aggrement between the Autonomous Community and the Badajoz Provincial Council ” Nº Aglomeration to Responsible Population provide WWTP administration Autonomous 8 1000-2000 Community of Extremedadura Badajoz Provincial 91 <1000 Council “ The main goal of the plan is to treat the urban wastewater discharges of all small aglomeration ”

THE EMISSION LIMIT VALUE TO APPROPIATE TREATMENT IN OUR SCENARIO. TWO WAYS. 1. ACCORDING TO TABLE 1 AND 2 OF THE UWWTD. GUADALQUIVIR SCENARIO. > 10.000 P.E. IN PARAMETER < 2.000 P.E. SENSITIVE AREA DAILY AVERAGE BOD 5 25 MG/L O2 25 MG/L O2 EXACTLY VALUE THE SAME DAILY AVERAGE COD 125 MG/L O2 125 MG/L O2 VALUE TO DAILY AVERAGE TSS 35 MG/L 35 MG/L VALUE ANNUAL AVERAGE TN VALUE 15 MG/L N 15 MG/L N ANNUAL AVERAGE TP VALUE 2 MG/L P 2 MG/L P

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.

THE EMISSION LIMIT VALUE TO APPROPIARTE TREATMENT. POPULATION [1.000-2000) [600-1000) [300-600) [100-300) < 100 EQUIVALENT DISTANCE FROM THE DISTANCE FROM THE DISTANCE FROM THE DISTANCE FROM THE DISTANCE FROM THE PRINCIPAL WATER PRINCIPAL WATER PRINCIPAL WATER PRINCIPAL WATER PRINCIPAL WATER EMISSION LIMIT VALUE BODY (Km) BODY (Km) BODY (Km) BODY (Km) 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 25 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 45 55 65 SOLID (mg/l) 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 5 6 7 8 5,5 6,5 7,5 - 6 7 8 - 7 8 - - 8 - - - (mg/l) TP -DAILY AVERAGE 3 4 5 6 3,5 4,5 5,5 - 4 5 6 - 5 6 - - 6 - - - VALUE (mg/l) TP- ANNUAL AVERAGE 1,5 2 3 4 2 2,5 3,5 - 2,5 3 4 - 3,5 4 - - 4 - - - VALUE (mg/l)

Wastewater technologies to achieve the Emission Limit Values ARTIFICIAL WETLAND WITH HIDROLITIC ANAEROBIC ROTATING BIOLOGICAL CONTACTOR DIGESTOR TO REMOVE NITROGEN COMPACT EXTENDED AERATION SEQUENCIAL BATCH REACTOR

How to establish the appropiate traetment? Normal urban discharge Loaded urban discharge LIMIT EMISSION VALUE LIMIT EMISSION VALUE LIMIT EMISSION VALUE LIMIT EMISSION VALUE OF WAY 1 OF WAY 2 OF WAY 1 OF WAY 2 SPACE NON- SPACE SPACE NON- SPACE SPACE NON- SPACE SPACE NON- SPACE AVAILABILITY AVAILABILITY AVAILABILITY AVAILABILITY AVAILABILITY AVAILABILITY AVAILABILITY AVAILABILITY < 100 ST or AD+VSSF AD+VSSF ST or AD+VSSF AD+VSSF AD+RBC EA AD+RBC +HSSW +HSSW AD+RBC +HSSW 100-300 AD+FBA AD+FBA AD+FBA AD+VSSF AD+VSSF EA AD+VSSF or or or AD+FBA +HSSW +HSSW AD+RBC DA+RBC AD+RBC 300-600 AD+FBA AD+FBA AD+FBA AD+VSSF AD+VSSF AD+VSSF or or or AD+FBA EA +HSSW +HSSW AD+RBC AD+RBC AD+RBC 600- AD+FBA AD+FBA AD+FBA AD+VSSF AD+VSSF AD+VSSF 1.000 Or or or SBR SBR+HSSW +HSSW +HSSW +HSSW AD+RBC AD+RBC AD+RBC > 1.000 A+FBA AD+FBA AD+RBC AD+RBC AD+FBA AD+RBC SBR+HSSW SBR AD: Anaerobic Digestion RBC: Rotating Biological Contactor VSSF: Vertical Subsurface Flow Constructed Wetland FBA: Forced Bed Aeration HSSF: Horizontal Subsurface Flow Constructed Wetland EA: Compact Extended Aeration ST: Septic Tank SBR: Sequencial Batch Reactor

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.

Thank you! pmartin@dip-badajoz.es