There are about 300 processing units operated by EYDAP, EYATH, the local DEYA and in a small percentage by the local authorities and inter-municipal associations. The basic processes that take place in these units are two: the treatment of the waste and the treatment of the remaining mud.
Waste ending up in the sewerage network is divided into:
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Domestic wastewater, wastewater from residential and service areas mainly derived from human metabolism and commercial activities.
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Industrial wastewater, any wastewater discharged from buildings and premises used for any commercial or industrial activity, and which is not domestic wastewater or rainwater.
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Rainwater, rainwater along with street washes
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Filtration - inflow water, which receives the sewer system due to its incomplete tightness and coming from the aquifer and surface runoff water.
Municipal wastewater is characterized by domestic wastewater or the mixture of domestic wastewater with industrial wastewater and / or rainwater.
The rainwater and sewage system is divided into:
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Mixed system, in which part of the sewerage supply is served with a separate system and part with pantorroic
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Pantorroic system, in which there is a common network for rainwater and sewage
Separation system, in which there is a separate network of sewage and rainwater collection pipes
The collection, transport, treatment and disposal of urban wastewater of various facilities is an obligation arising from the principle of environmental protection, the general regulations of Law 1650/86, the special regulations of Sanitary Order E1b / 221/65, of Directive 91 / 271 / EEC and JM 80568/4225/91. As the treatment plants differ in the local DEYA, it is possible that there are differences in the operating regulations and therefore in the emission limits of the runoff. Table 1 lists the limits of industrial runoff in the sewers, for the EYDAP surveillance area.
Table 1: Table of emission limits of industrial effluents in sewers (EYDAP)
|
Παράμετρος |
όρια |
Παράμετρος |
όρια |
|
pH |
6-9 |
Cd |
0,5mg/l |
|
Θερμοκρασία |
350C |
Cr III |
2mg/l |
|
BOD5 |
500mg/l |
Cr VI |
0,5mg/l |
|
COD |
1000mg/l |
Co |
10mg/l |
|
Αιωρούμενα στερεά |
500mg/l |
Cu |
1mg/l |
|
Χονδρά στερεά |
1,5cm |
CN- |
3mg/l |
|
Διαλυμένα στερεά |
3000mg/l |
F- |
20mg/l |
|
Απορρυπαντικά |
50mg/l |
Fe |
15mg/l |
|
Λίπη – έλαια |
40mg/l |
Pb |
5mg/l |
|
ορυκτά έλαια |
15mg/l |
Mn |
10mg/l |
|
ΝΗ3 - Ν |
25mg/l |
Hg |
0,01mg/l |
|
ΝΟ2- Ν |
4mg/l |
Mo |
10mg/l |
|
ΝΟ3- Ν |
20mg/l |
Ni |
10mg/l |
|
ΡΟ43- - Ρ |
10mg/l |
Φαινόλες |
5mg/l |
|
SO32- |
1mg/l |
Se |
0,2mg/l |
|
SO42- |
1500mg/l |
Ag |
5mg/l |
|
H2S |
1mg/l |
Th |
2mg/l |
|
Al |
10mg/l |
Sn |
10mg/l |
|
Sb |
5mg/l |
Ti |
10mg/l |
|
As |
0,5mg/l |
U |
5mg/l |
|
Ba |
20mg/l |
Zn |
20mg/l |
|
Be |
30mg/l |
Καθιζάνοντα στερεά |
10ml/l |
|
B |
10mg/l |
Ελ. χλώριο |
5mg/l |
|
Br |
10mg/l |
|
Businesses, such as industries, handicrafts, workshops, car washes, etc. which discharge into the sewerage network except domestic sewage and rainwater, industrial or other waste must have a separate internal network for this waste and have a relevant permit from EYDAP (or other DEYA) for their legal connection.
For these companies, the external branch adaptation well can also be a liquid waste control and sampling well (treated or not).
The sampling is done by the Liquid Waste Control and Supervision Service of EYDAP without notifying the companies, for the control of the generated waste. The check is made for the safety and good operation of the network and the processing facilities to which it ends (eg for Attica, Psytallia, Metamorfosi).
In case the generated waste is outside the limits of the parameters that are set (eg table 1 for Attica), each company must proceed with appropriate work and if there is no compliance, the water supply can be stopped. At the same time, the company is significantly burdened with the respective water and sewerage bills.
Industries and handicrafts are generally located in industrial zones, industrial or craft parks. Their license is divided into two stages: The installation license and the operating license. The installation permit is issued initially, it is possible to install equipment. During the period specified in the installation permit, with the unit fully installed and after the certificate of suitability from the Department of Health or the Department of Rural Development (in the case of agricultural products) the operating license is issued, so the company operates legally .
Respectively, licenses are required from less troublesome companies, such as workshops, warehouses, shops, retail and restaurants.
For the issuance of an operating license and for companies that produce and dispose of hazardous waste (as defined in Decision No. USA13588 / 725/06 - Government Gazette 383B / 2006) and approval of environmental conditions is required, approval by EYDAP, the study of industrial waste treatment.
Laboratory testing of liquid waste is required for the submission of the study. It is of primary importance to control the waste both at the point of exit and in the individual production processes, especially in cases where exceedances of the parametric value limits are recorded. The main monitoring parameters for some industries are summarized in Table 2.
Table 2: Main parameters of liquid waste monitoring by industrial activity
|
Βιομηχανικός κλάδος |
Παράμετροι παρακολούθησης |
|
Παραγωγή – επεξεργασία κρέατος |
BOD, COD, SS, TDS, TN, TP, pH, λίπη-έλαια |
|
Επεξεργασία αλιευμάτων |
BOD, COD, SS, TDS, TN, pH, λίπη-έλαια |
|
Επεξεργασία λαχανικών |
BOD, COD, SS, TDS, pH |
|
Παραγωγή λιπών-ελαίων |
BOD, COD, pH, λίπη-έλαια |
|
Παραγωγή γαλακτοκομικών |
BOD, COD, SS, TDS, TN, TP, pH, λίπη-έλαια |
|
Οινοποιεία |
BOD, COD, SS, TDS, pH |
|
Κλωστοϋφαντουργεία - εριοπλυντήρια |
BOD, COD, SS, TDS, TN, TP, pH, λίπη-έλαια, Cr, φαινόλες |
|
Βιομηχανία ξύλου – κατασκευής επίπλων κλπ |
BOD, COD, SS, TDS, TN, pH, φαινόλες, βιοκτόνα, οργανικοί διαλύτες |
|
Παραγωγή σαπώνων & απορρυπαντικών |
BOD, COD, SS, TDS, pH, λίπη-έλαια, επιφανειοδραστικά |
Consult HELLASCHEM for: