Waste water plant modernization - Adjud municipality

The feasibility study describes the works necessary for the achievement of water water plant of Adjud municipality.

The plant has been sized considering:

the standard for the designing of constructions and waste water treatment plants NP 032-1999
Number of equivalent inhabitants (EI): 26.000
Flows:
- Qday-average = 3900 m3/day
- Qday-maximum = 4680 m3/day
- Qhour-maximum = 292.5 m3/h
- Qhour-minimum = 49 m3/h
Specific loads per equivalent inhabitant (EI):
- solid matters in suspension – 70 g/EI and day
- CBO₅ - 65 g/ EI and day
- total nitrogen– 11 g/ EI and day
- total phosporous – 2,5 g/ EI and day
Quality parameters imposed by the current standards (NTPA011/2005)

The waste water treatment plant is a compact plant including:

mechanical treatment stage
biologic treatment stage with active sludge where secondary and tertiary water treatment is simultaneously performed
sludge treatment stage

The solution of compact treatment plant ensures the following advantages:

ensures the required treatment degree by observing the quality conditions imposed for discharging by the standard NTPA 011-2005;
ensures the required treatment degree by observing the quality conditions imposed for discharging by the standard NTPA 011-2005;
more efficient secondary settling by installing lamellas;
using air-lift type pumps or sludge removing pumps through compressed air which are simple, reliable and do not need maintenance; this technology ensures long time wear-less operation;
using easily detachanble component such as membrane aeration tubes, pumpes and mixers allowing rapid replacement of damaged parts under operation;
due to high performance technological process no sludge in excess is removed so that sludge treatment costs are cut;
all equipment are made of stainless steel and no issues related to water or sludge action on components occur;
the ultraviolet disinfection performed in UV type system is advantageous as compared to chlorination solution which lead to toxic compouns in receiving water environment; the disinfection plant ensures an efficiency up to 99% as far as total coliforms are concerned.
sludge dehydrating plant ensures volume reduction and the conditions of conveying and storing;
the process control system ensures plant reliability.

Services provided: Feasibility study

The table below includes quality main indices of waste water at treatment plant inlet and outlet:

Crt. no	Indices	Treatment plant inlet	Treatment plant outlet
1	CBO5	65 g/ EI and day	<25 mg/l
2	CCO	-	<125 mg/l
3	Total suspensions	70 g/LE and zi	<35 mg/l
4	Ammonia	-	<3 mg/l
5	Total nitrogen	11 g/LE and zi	<15 mg/l
6	Total phosphorus	2,5 g/LE and zi	<2 mg/l

Country/Location:

Romania, Vrancea county, Adjud

Client:

Adjud municipality

Project start/completion date:

March 2008 - May 2008

ISPE