Small Waste Water Treatment Plants WWTP Technical aspects and cost - - PowerPoint PPT Presentation

Small Waste Water Treatment Plants WWTP Technical aspects and cost estimation of pilot plants

Indira Sulejmanagić Sanja Bosiljčić Pandur

WWTP and Sewerage System

• In BiH, inadequate

inadequate at atten tentio tion was given to protection of waters in in the past.

• This situa

situati tion

• n wa

was ad additio itional ally ly aggra aggravate vated by by in infrast frastructu ructural al dama mages, that occurred due to war activities (during the period 1990-1995), and inap appr prop

• pri

riate ate re repa pair ir and and ma main inten tenan ance ce serv service ices, caused by difficult financial situation of public utility companies.

• Percentage of pop
• pula

latio tion con connecte ected to to the the se sewe wera rage ge syst systems ems in in urban are reas (cities and settlements > 10,000 inhabitants) is is about 56 56%.

• Gen

Genera erally, ly, the the smal smalle ler, r, rural rural settleme settlements nts ha have no no sewera sewerage ge system

• system. Some of them, that have a sewerage system for collection
• f waste waters, usually are without the waste water treatment.

That means that the untreated effluent is discharged into recipients, what present a serous threats against for human health.

The key problems of waste water treatment plants / WWTP in the whole Bosnia and Herzegovina are as follows:

• Most of the planned wastewater treatment plants are not built,

neither were reconstructed;

• The existing WWTP are under-maintained (due to low water price -

insufficient for functionality costs of a simple water system), and they lose their planned efficacy, quite fast;

• Even in towns and settlements that have a WWTP, insufficient

inhabitants are connected to facilities.

WWTP and Sewerage System

• Thanks to international organizations and programs funds (World

Bank, KfW, EIB, EBRD, IPA, SIDA), as well as local participation of municipalities and financing from Environmental Protection Fund FB&H, curre rrent constru constructio ction level vel / situ situatio tion of

• f WWTP

WWTP is is im improve ved. So far, a number of fac facil ilitie ities is bu built lt or

• r rec

reconstru nstructed cted, which have already been put into operation, such as: Živinice 25.000 PE, Sre Srebre brenik ik 18.000 PE, Bi Bije jeljin jina 40.000 PE, Tr Treb ebinj nje 16.000 PE, Bileća 5.000 PE, Ljubuški 6.000 PE, Čitluk 7.000 PE, Žepče 6.000 PE, Trnovo vo 5.000 PE, Odžak 10.000 PE.

• Plants in Sa

Sarajevo ajevo 600,000 PE and Konjic

• njic 5,000 PE are in test

test

• peration

ation phase.

• The construction of the facilities for the city of Mostar

Mostar and and Bihac Bihac (100,000 and 55,000 PE) is in in imple implement mentati tion, and WWTP for settlements Tomis Tomisla lavgr vgrad ad and and Siro iroki ki Bri Brije jeg (each 10,000 PE) are in prepara arati tion

• n phase (for the works).

WWTP and Sewerage System

Definition and Classification

• The resu

esult lt of wastewater treatment is the rem remova

• val of
• f ha

harmful mful su substa bstance nces from the water and thus is is ach achieve eved / pro provi vide ded a certa certain in req require ired sanitary, sanitary, che chemica ical, l, eco ecolog

• gic

ical al and and ae aesthe sthetic tic quality ity of

• f natura

ral recipie ipients ts.

• Facilities by size: for

for la large ge and med mediu ium citie cities and and smal small town wns and and villag ages.

• Plant size for smaller towns and villages: up

up to to 50 50 PE PE and nd betwee een 50 50 and and 5,000 000 PE PE (in rare cases up to 10,000 PE).

Technological Scheme

Pre-treatment

• 1. Stage
• 2. Stage or biological

treatment

• 3. Stage

Disinfection primary sludge secondary sludge Discharge of treated water Waste from grids, sand, gravel, fat Sludge treatment N and P Pathogenic organisms Organic substances The level of treatment Isolated substances

• 1. Stage

primary sludge

• The usual purification technology / waste water treatment

includes:

Investment Costs - Conventional Plant

Invest estment ment Cost st WWTP TP

€/PE PE Siz ize (PE) Wit ith h a receiving ceiving stat ation ion for

• r waste

e water er from

• m

septic ptic tank nks Wit ithout

• ut a rece

ceivin iving g stat atio ion for

• r waste

e water er from

• m

septi ptic c tank nks

Small Settlements

• In smaller settlements there is the problem

roblem of

• f lack

ack of

• f pr

prof

• fess

essio ional al staff ff and and limite ted financial ancial resources urces

• The advantage

tage of

• f plants

ts wherein the:

• Energy consumption is small or a zero
• Operation and maintenance are simple
• The efficiency and continuous work are good and at

extremely high variations of flow and level of influent's load

• Small or no sludge production and its simple treatment
• The smaller WWTP that meet these requirements are classified as

so-called. unconven ventio tiona nal

• GEF - Project of water quality protection
• Feasibility study on the implementation of

natural treatment procedures of urban waste water of small towns and settlements on territory of Bosnia and Herzegovina

• The objectives of this study were:
• 1. to develop the proposals for improving

wastewater management through the implementation of „NTC" - technology

• 2. to identify the optimal strategies for the need

"NCT" - technology wastewater treatment with regard to natural, social, cultural, economic, institutional and climatic aspects and other features

• 3. to create a long-term and short-term investment

plans for waste water treatment plants, based

• n the application of "NCT" - technology
• 4. to identify the pilot projects of waste water

treatment with a low cost / low energy consumption in various typical areas of Bosnia and Herzegovina As pilot projects, the following settlements were selected:

• Velagići+Hadžići (Appli

pplied d Techn hnolo

• logy

gy: Hybrid brid art rtif ificial icial wetlan lands ds with h the e remov

• val of nut

utri rien ents), Municipali nicipality of Ključ, FB&H

• Grbo

bore rezi i (Appli pplied ed Tec echn hnolog

• logy: Hybrid

brid art rtif ificial icial wetland lands with h the e remov

• val

al of nut utri rien ents), Municipali nicipality of Livno,

• , FB&H
• Orahova (Applied Technology:

Trickling filter), Municipality of Gradiška, RS

Study of unconventional technologies and Pilot projects

Investment Costs

Investment costs per PE for some types of small plants

700 €/PE 0 PE 2.000 PE 4.000 PE 6.000 PE 8.000 PE 10.000 PE

Plant size The stabilizing wetlands The artificial wetlands Hybrid artificial wetlands Rotating biological contactors

600 €/PE 500 €/PE 400 €/PE 300 €/PE 200 €/PE 100 €/PE 0 €/PE

Trickling filters

Operation and Maintenance Costs

Annual operation and maintenance costs / PE

700 €/PE 600 €/PE 500 €/PE 400 €/PE 300 €/PE 200 €/PE 100 €/PE 0 €/PE 0 PE 2.000 PE 4.000 PE 8.000 PE 6.000 PE 10.000 PE

The stabilizing wetlands The artificial wetlands Hybrid artificial wetlands Rotating biological contactors Trinkling filters Plant size

Preliminary design of WWTP for settlement Grborezi, Municipality of Livno

GENERAL:

• Responsible persons and residents

were very interested for the project

• The proposed settlement is located

in a karst area, Livno field, that has a size of 30,000 hectares, and is

• ne of the largest in Europe
• Sensitive area - the area of karst
• The water from the Livno field is

used in the Republic of Croatia for drinking

• Residents
• f

the settlement Grborezi participated with 50% of funds in the investment for construction of sewage system

• Climate: mountain
• The whole settlement Grborezi

counts of 800 residents

• The settlement has no industry

SEWERAGE SYSTEM:

• Two phases of construction of the sewage system have

been completed, that includes the main collector and several secondary collectors construction

• The sewage system is separate. The main collector

(3,000 m, DN 300) is currently finishing in a septic tank

• Recipient is the irrigation canal, that is over the year

mostly dry

• The existing sewage system is designed for the 1200

PE

LOCATION OF WWTP:

• There is a potential location for the wastewater

treatment plant in the field called „Podovi„

• The site is in private ownership, but according to

information received from inhabitants solving this issue should not be a problem because the owner is willing to cooperate

• The high level of ground water (approx. 80 cm in

winter), filling of the terrain is necessary

Taking into consideration the local conditions for settlement Grborezi, the following technological scheme has been chosen:

• Mechanical treatment: screening, gravity longitudinal sand

tank - grid chamber and septic tank reconstructed in to the primary sedimentation tank;

• Chemical treatment: flocculation to eliminate the total

phosphorus;

• Biological treatment: hybrid artificial wetlands, stabilization

tank;

• Sludge: Primary sludge form the primary sedimentation tanks

is taken into silo/tank.

• For further treatment of sludge is planned that the sludge

should be taken on fields used for topsoilin;.

• Because of the required conditions of effluent quality at the
• utflow, the proposed solution involves tertiary treatment

purification.

Predložena lokacija budućeg postrojenja

Rešetka Pjeskolov VSSF VSSF Efluent

W3

The proposed location of the plant

Screen Grid chamber Hybrid artificial wetlands Hybrid artificial wetlands Effluent

Preliminary design of WWTP for settlement Grborezi, Municipality of Livno

INVESTMENT COSTS Investment costs are taken from the priced bill of quantities and in total are estimated at 327,353.85 €. Note: The total value of the investment costs does not include costs of design documents of a higher level, as well as VAT. OPERATION AND MAINTENANCE COSTS The operation costs include the costs of energy consumption, costs of chemicals, costs of waste disposal from the grid and of sludge, as well as personnel costs (for plant maintenance) and the same are assessed on an annual basis to 29.894 € / year.

Preliminary design of WWTP for settlement Grborezi, Municipality of Livno

GENERAL:

• Velagići / Hadžići is the second largest

settlement in the municipality of Ključ with about 2,350 inhabitants

• Climate: medium continental
• The proposed settlements are in the area of

karst

• WWTP Velagići+Hadžići: 2.200 PE
• Sewerage systems of these settlements are

designed as two separate units and in the current project proposes there are two smaller plants for wastewater treatment

• The

population is mainly engaged in agriculture, and there is less wood industry

SEWERAGE SYSTEM:

• In LC Velagići there are two separate, newly

constructed sewage systems, because area of local community is divided into two basins, streams Točine and Vojića potok. Both systems are designed for a total of about 3,500 PE, up to the end of the planning period (planning period is 25 years).

• The

recipient is stream Točine, that disappears underground. It is assumed that the water appears again, at sources along the river Sana.

LOCATION OF WWTP:

• The municipality has offered a potential

location for NCT plant. It is located upstream

• f the abyss, in the valley of stream Točina.
• Outflow / discharge in a sensitive area (abyss)

Preliminary design of WWTP for settlement Velagići-Hadžići, Municipality of Ključ

Taking into consideration the local conditions for settlements Velagići and Hadžići, the following technological scheme has been chosen:

• Mechanical treatment: inlet pumping station,

screening, aerated grid chamber and Imhoff tank

• Chemical treatment: flocculation to eliminate

the total phosphorus;

• Biological treatment: hybrid artificial wetlands,

stabilization tank;

• Sludge: Primary sludge form the Imhoff tank,

is further processed in the same in the part representing digestion compartment. From Digestion compartment, sludge is discharged

• n fields used for topsoiling of sludge.

Due to the require equired d out utflo low efflue luent nt quali ality require equiremen ents, the proposed solution involves tert ertia iary ry trea eatment nt of purif urificat ication ion.

Predložena lokacija budućeg postrojenja Rešetka Pjeskolov VSSF VSSF Efluent

W3

The proposed location of the plant

Screen Grid chamber Hybrid artificial wetlands Hybrid artificial wetlands Effluent

Preliminary design of WWTP for settlement Velagići-Hadžići, Municipality of Ključ

INVESTMENT COSTS Investment costs are taken from the priced bill of quantities and in total are estimated at 520.890,75 €. Note: The total value of the investment costs does not include costs of design documents of a higher level, as well as VAT. OPERATION AND MAINTENANCE COSTS The operation costs include the costs of energy consumption, costs of chemicals, costs of waste disposal from the grid and of sludge, as well as personnel costs (for plant maintenance) and the same are assessed on an annual basis to 30.444 €/year.

Preliminary design of WWTP for settlement Velagići-Hadžići, Municipality of Ključ

Financial needs for potential NCT in selected targeted areas

• According to the ranking (rating list) of priorities, through NCT

study were identified 670 70 pot

• tentia

ntial non non-con conve ventio ntional al plants plants, with a capacity between 500 and 10,000 PE.

• Total amo

amount nt of

• f in

investme vestment nt requ quir ired ed for for the the po poten tential tial NCT NCT in in B&H B&H is is about about 530 530 mil.KM KM (270 270 mil. of

• f EUR).
• Annu

Annual operatin ting and and mainte maintenance ce co costs, sts, for all ll iden identifie tified NCT NCT plants, ts, are estima imated ted at at 43 43 million

• n. KM

KM (22 22 mil. of

• f EUR).

COOPERATION

"Ecor

• rem

emediat ediation ion for r protect

• tection

ion of th the envi viro ronm nment ent and developmen velopment of the Una-Sana Sana Canton ton" is a project worth 391,166.00 KM, that is implemented by the Center for International Cooperation in Developing - CMRS, of Republic of Slovenia and the Environmental Protection Fund of FB&H. The result sult of the project is in installe alled d pilo ilot devic vice of this is type pe, within the area of the Biotechnical Faculty of Bihać.

Conclusions

• There is a Study about the applicability of NTC plants, and Bo

Bosnia ia and Herze erzegovi

• vina has

as the the ba basic sic pla lanni ning do document cument, and within the same, the guidelines for solving of wastewater collection and treatment problems in smaller settlements;

• The financial situation in B&H, especially in small rural settlements is not

favorable / good, thus inve nvestme stment nt in in pr proj

• jects

ects of

• f waste

aste wa water ter trea treatme tment nt, in terms

• f survival for population in smaller towns, does

does not not pre presen sent top top of

• f pri

priori

• rities

ties of

• f

smalle ler commu muni nitie ties;

• From the aspect of basic living conditions insurance, and according to

experience in the field, it is concluded that residen esidents ts and and lo loca cal commu communitie ities are are awa ware re of

• f the

the importance importance and and nee eeds ds for for pro projects ects impleme implementa ntati tion

• n, and for the

same they expressed essed significan ficant interest rest.

Conclusions

• Solutio

tions:

• Technical

hnical assistan stance ce provide ide by by forei eign consult ultan ants ts

• Obtai

Obtaini ning fina financ ncia ial resource resources thro throug ugh EU EU fu fund nds and nd pr pre-acce accessio ssion financi ncing programs rams

• Estab

Establish lishmen ent of

• f a new

new, su suitab itable fina financial ncial mech mechan anism isms for for pro proje jects cts financi ncing, with support

• rt of
• f EU

EU partne tners rs

Small Waste Water Treatment Plants WWTP Technical aspects and cost estimation of pilot plants

Indira Sulejmanagić indira.sulejmanagic@fzofbih.org.ba Sanja Bosiljčić Pandur sanja.pandur@fzofbih.org.ba