O imagine de ansamblu privind epurarea apelor uzate-Cazul companiilor grecesti

An Overview on Waste Water Treatment The case of Greek Companies

Definitions Water = Life New demands Wastewater Wastewater treatment Re-use of Wastewater

Waste Water Includes:  Human

waste  Food scarps  Oils  Soaps  Chemicals  Industrial Raw materials  Storm runoff

Wastewater treatment Wastewater treatment is Water use A process that removes the dangerous substances from the wastewater In order that the remained water can be used again in the environment, in the agriculture, in the industrial process etc

Process Flow Diagram for a typical large-scale treatment plant

Wastewater Treatment  Pre-

treatment  Primary Treatment  Secondary Treatment  Tertiary Treatment  Sludge

Pre - Treatment Removes materials that can be easily collected before they damage or clog the pumps and skimmers of primary treatment clarifiers (trash, tree limbs, leaves, etc.)  Screening  Grit removal  Fat and grease removal

Primary Treatment  Removes

60% of suspended solids and 30% of BOD  Sedimentation stage consists of primary clarifiers  Aerating wastewater  Saponification  The remaining liquid may be discharged or subjected to secondary treatment

Secondary Treatment  It

includes the wastewater aeration and sludge clarification  Removes more than 90% of suspended solids  Uses biological processes  Aerobic biological processes  Anaerobic biological processes

Secondary Treatment ďƒ˜ The

clean supernatant water can be disposed to the environment after disinfection and eventually filtration ďƒ˜ Municipal and industrial plants usually use aerobic biological processes.

Tertiary or Third Degree Treatment Tertiary Treatment is defined as anything more than primary and secondary treatment in order to allow rejection into a highly sensitive or fragile ecosystem Main aim is the abstraction of phosphor and nitrogen

Tertiary or Third Degree Treatment Treated water is sometimes disinfected chemically or physically prior to discharge into a stream, river, bay, lagoon or wetland, or it can be used for the irrigation of a golf course, green way or park.

If it is sufficiently clean, it can also be used for groundwater recharge or agricultural purposes.

Sludge  Treatment

of sludge  Disposal of sludge  Anaerobic Sludge Digestion / Biogas Handling  Dewaterd Sludge Handling  Composting  Incineration

The Use of Recycled Water helps people in two ways : Reclaimed water can supply needed water for some purposes ď Ź Reclaimed wastewater frees up fresh water that can be used somewhere else ď Ź

Wastewater treatment for industries Selecting the appropriate system for a plant or an industry, the most important factors to consider are:  The treatment efficency  The affected in resistance to pollutants  The easy licensing proccess  The scalability

Engineering - Design Construction The main activities of Greek companies working in the field of environmental protection are:  The design of treatment plants for domestic, industrial and agro industries wastewater  The construction of the necessary equipment for the total plant as well as pre construction of compact units for pretreatment of wastewater  The operation and maintenance of the installed equipment.

Wastewater Treatment Plant of Thessaloniki City

Psittalia Waste Water Treatment Plant

Wastewater Treatment Plant of Thessaloniki City chart flow

Industrial Areas (VI.PE.)

The case of “HELLENIC FABRICS S.A.”

MOTHER NATURE EVERYDAY HERO OF WASTEWATER TREATMENT

WASTEWATER IS A GLOBAL CHALLENGE. AND WE ARE UP TO IT.

Thank you for your Attention FONDUL SOCIAL EUROPEAN Programul Operaţional Sectorial Dezvoltarea Resurselor Umane 2007-2013 Axa prioritară nr. 3 „Creşterea adaptabilităţii lucrătorilor şi a întreprinderilor” Domeniul major de intervenţie 3.2. „Formare şi sprijin pentru întreprinderi şi angajaţi pentru promovarea adaptabilităţii” Titlul proiectului: : „COPMED – COMPETENTE PENTRU PROTECTIA MEDIULUI” Contract nr. POSDRU/81/3.2./S/52242 Proiect cofinanţat din Fondul Social European prin Programul Operaţional Sectorial Dezvoltarea Resurselor Umane 2007-2013 –„Investeşte în oameni!