section 11 – technical specification itb 21-2017 english
Post on 08-Jan-2022
1 Views
Preview:
TRANSCRIPT
Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
TECHNICAL SPECIFICATION annexed to the Baseline Wastewater Treatment Project in the village of Novo Konjarevo,
Municipality of Novo Selo
1. INTRODUCTION
The basic demand when projecting wastewater treatment plants is to enhance the energy
efficiency and the superior quality of decontaminated waste waters. The communal
wastewater treatment plants have to align with the quality demands which increasingly get
higher, especially if this relates to BPK5, as well as the levels of nitrogen and ammonia, which
are growing as the population grows.
Most importantly, the wastewater treatment plant is expected to meet the required
standards and have minimum impact on the environment.
2. LAYDOWN AREA – WWTP (MBBR1000)
This laydown area shall cover the area of the village of Novo Konjarevo in the municipality of
Novo Selo, which is located at some 5km distance from the municipality of Novo Selo. There
is a project ongoing in the village of Novo Konjarevo, for construction of faecal sewerage
network, which is separated from the atmospheric sewerage network. The faecal sewerage
network in this area is gravitational.
The number of inhabitants of this laydown area, for which the project documentation is
developed, reaches 1000 inhabitants. Construction of WWTP - MBBR1000 was envisaged in
this laydown area, where recipient is Strumica River, that is, the collector projected to be
constructed near to the river.
The raw waste water was envisaged to contain minimum fats and oils, because the facilities
producing highest amounts of fats and oils are obliged to place separators where formed.
3. WASTEWATER QUALITY
The wastewater characteristics presented in the upper Table are in accordance with data
collected from literature on wastewater decontamination. The values have been adopted on
water supply norm of Q0 = 150 l/z/d.
Source of wastewater: Sanitary wastewater from residential areas.
Basic wastewater characteristics:
• High level of suspended substances
• High level of organic substances
• High level of microbiological activities
• Content of fats and oils, max. 50 mg/l
Typical composition of sanitary-faecal wastewater is presented in the Table below:
Table: Characteristics of communal water – pursuing available literature
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
4. QUALITY OF PURIFIED WATER
By constructing the separated waterway system for communal wastewaters and WWTP –
MBBR1000, the treatment plant shall be intended to treat communal waste waters, by not
burdening it with industrial waters and thus, the required quality of the effluent shall meet
the effluent standards, given in the EU Directive on Urban Waters (91/271/EEЗ, 98/15/EЗ),
for sensitive areas;
Table. Comparative parameters with the necessary treatment level
Parameter
Expected
concentration of
wastewater
Limit values of
emission
Required level
of purification
– RLP (%)
pH 7,0 6,5 – 9,0 /
Temperature / 30 /
Suspended substances 367 35 90.5%
Deposits / 0,3 /
HPK 800 125 84,3%
BPK5 400 25 93,8%
Total fats and oils 120 20 83,3%
Parameter
Concentration mg/l
Limits Typical
Physical
Dry substance – total 300 -1200 700
Easily deposited particles 100 – 400 220
Suspended particles – evaporating 70 – 300 150
Dissoluble particles – total 250 – 850 500
Dissoluble particles – evaporating 100 – 300 150
Chemical
BPK5 100 – 400 250
HPK 200 – 1000 500
TOC 100 – 400 250
Nitrogen
Total 15 – 90 40
Organic 5 – 40 25
Ammonia 10 – 50 25
Phosphorus
Total 5 – 20 12
Organic 1 – 5 2
Non-organic 5 – 15 10
pH 7 - 7,5 7,0
Calcium 30 – 50 40
Chlorides 30 – 85 50
Sulphates 20 – 60 40
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
Total chlorine 0 0,4 0%
Total nitrogen 70 10 85,7%
Ammonia nitrogen 40 10 75%
Total phosphorus 16 2 87,5%
NOTE: In the given legislation, the totals of nitrogen and ammonia nitrogen have to be equal.
Total nitrogen: organic N + NH4-N + NO3-N + NO2-N. That would imply that the
mineralisation of organic substances has been fully implemented (the TKN would be 0), and
non-organic nitrogen should be absent, which is impossible.
Nominal temperature of entry water: min. + 12°C, Annual average +17°C, max. +20°C.
Nominal temperature of outdoor air: min. – 10°C, max. +28°C. To achieve limit values,
separation is necessary of atmospheric and faecal sewerage and only faecal wastewater
should be poured into the plant.
The treatment plant is projected under the Book of Regulations on terms, manner and limit
values of the emission of wastewaters following their purification, the manner of their
calculation, given the special requirements for conservation of protected areas (Official
Gazette of RM, nr. 81/11).
5. QUANTITY OF WASTEWATER
For the given scope of work, the water quantity is a result of the assessment of equivalent
inhabitants that shall benefit from the treatment plant by the completion of exploitation
deadline. Average daily water consumption per equivalent inhabitant (EI) reaches 150
l/day/inh.
The number of inhabitants in this laydown area, added to the ratio of population growth for
a 30-year period, amounts 1000 inhabitants. For this laydown area, construction of WWTP –
MBBR1000 was envisaged, having Strumica River as recipient.
The quality of purified water is expected to meet physical-chemical standards for discharge
in the surface watercourse – Strumica River.
Based on the hydraulic calculations made, the hydraulic dimensioning of WWTP was
completed, pursuing the following entry parameters, the number of inhabitants and the
water supply norm, which are the basic entry parameters for dimensioning treatment plants.
Number of inhabitants WWTP = 1000 E.I. (equivalent inhabitants).
Discharge norm reaches Qo = 150 (l/day/inh.).
Hydraulic dimensioning of WWTP
���/��� = �.�� �.��.��
= �, ���/�, Average hourly wastewater flow.
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
�� = 1.5 +2.5
��� / !�"
�� = 3.39, Coefficient of daily fluctuations.
�%�&/ !�" = �'( /!�" ∗ ��(+ /',-) = 5,90+/'
0!�" =1 � /!�" ∗ 86400
1000= 150(%3/ !�")
Discharge norm for daily consumption should cover equivalent inhabitant Qo=150 l/day. It is
necessary to mount container type of treatment plant 1000 EI, in capacity of 150 m3/day,
which shall follow the principle of MBBR technology.
6. TECHNICAL PARAMETERS OF WWTP – MBBR1000
The treatment plant is consisted of AB pumping station, AB reservoir to collect wastewaters
and MBBR reactor.
The pumping station is attached to the reservoir and is consisted of 2 (two) carrier pumps
with the following characteristics: Q=3.5/s, H=5.50m. Each pump has special compression
pipeline leading to the first chamber of the egalisation reservoir. The pump station should be
accompanied by a locker with a count control, options for manual and automatic operation.
The automatics should be connected with a level of depth plumb-line to control the
operation of the pumps.
A pump is placed in the reservoir to organise the dosage of raw wastewater that should
further flow onto the central treatment plant. The basin is with volume of 50m3
serving to
level up the inflow quantities, and it also serves as a depositor.
The central treatment plant is of container type and is placed above a concrete panel. The
wastewater treatment plant in the treatment capacity of 150 m3/day (1000 PE) is in
compacted package 11,9 x 2,2 m. The station has to use a two-level technology MBBR
(Moving Bed Bio Reactor) (high and medium-size compression), projected for optimum
organic compression for high performance and production speed of mill <75 kg/day. The
energy consumption of this station is below 0,95 kWh/m3 of treated water. Besides, the
station is FULLY MOUNTED ON ONE SINGLE MOVING STRUCTURE, which covers a screening
system, bio reactors, decentralised and control chamber. These characteristics shall enable
easier movement and displacement of the system, it considerably reduces the space to place
visual effect and the device transport may be carried out by using a container or a platform
track. The MBBR system is a flexible solution due to its stability during outflows and
variations of loading, with no significant changes in the installation. Actually, the reactors
may be filled from 30%-70% of the carriers’ volume, making the adjustment of volume of
carriers and the aeration sufficient to cope with such variations.
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
The produced wastewater should meet the required limits for drainage into the
watercourse, according to the organic, physical and microbiological parameters as set in the
DIRECTIVE 91/271/EEC, into effect in Macedonia (BOD <25 mg/l, COD<125 mg/l, TSS<60
mg/l), having in mind the bio-degradable urban wastewater or equivalently to (BOD 400
mg/l, COD 1000mg/l, TSS 400 mg/l) and guaranteed outcome of purification that is higher
than 90%.
The device has to be robust, fitting and modularly, manufactured as per CE certificate. Fully
tested in a factory (hydraulic and electric tests, outflow check, automatisation...), as per
quality management system standards. In addition, for easier and direct mounting without
construction works, it should be supplied with a solution for quick plug in and operation
(plug&play).
The device includes the following components:
SUBMERSIBLE PUMP: one (1) submersible pump for wastewaters, produced by stainless still
A/INOX, propulsion pump for transition of free solid substances up to 50 mm, engine power
of 1.2 kW, engine insulation of class F and IP68 protection, high efficiency IE3, plugged in
system for automatic plug in using mechanism for fixation and handling for easy installation
and maintenance. Characteristics of a pump with sufficient density and pressure to ensure
continuous flow throughout the station and flow of re-circulation which returns back to the
reservoir for homogenisation, thus enabling continuous and efficient fusion of raw water. It
should be installed into the homogenisation tank (out of scope).
FUSION HOMOGENISATION SYSTEM is included of organic loading and flow regulation.
DETAILED THOROUGH RECORDING: one (1) self-cleaning dynamic rotation tank to filtrate
liquid or for sifting and dehydration of solid substances, with processing capacity of 56 m3/h,
manufactured with stainless steel A/INOX 316L, at a distance of 3 mm, engine power of 0,18
kW, self-cleaning system with double rake and automatic cleaning with indoor and outdoor
water pressure injection.
BIO REACTORS WITH HIGH AND MEDIUM-SIZE COMPRESSION, frame profiles and sheet
metals manufactured from carbon steel, with width of 4 mm, inlay with welded and
imprinted FRP and 4-layer outlay (abrasive cleaning of the metal surface, epoxide and
polyester enamel, final layer with imprinting treatment), with removable covers, including
manholes to check reactors and valves for drainage of tanks.
The reactors are filled up with 70% volume of CARRIERS, manufactured from high density
polyethylene (HDPE), with minimum specific surface of 650 m2/m3.
The bio reactors include OXYGENISATION SYSTEM, consisted of blower with one (1) one-
level canal, produced by cast aluminium, 5,5 kW power, motor insulation of class F and IP55
protection, available high efficiency IE2, integrated heat protection, used with changeable
speed drive, as deemed necessary.
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
AIR DISTRIBUTION SYSTEM with steel pipe while emptying the blower, self-regulation
system with pressure and flow, to enable air with homogenous diffusion, oxygen injected
efficiently into a fused liquid for optimum control of oxygen concentration into the treated
volume.
LAMELLA CONE-SHAPE DECANTER (SEDIMENTATION TANK), profiles of frame and metal
sheet manufactured from carbon steel, with width of 4 mm, inlay with welded and imprinted
FRP and 4-layer outlay (abrasive cleaning of the metal surface, epoxide and polyester
enamel, final layer using imprint treatment), with removable covers, including manholes to
check the tanks and valves for reservoir drainage.
LAMELLA CLARIFIER produced from PVC, with specific surface of 6,25 m2/m3 and with raked
panel under a 60° angle, to improve the sediment separation.
One (1) SYSTEM FOR FLOCULENT DOSAGE (substance improving the collection of particles,
especially for wastewater treatment) is included to improve sediment decantation
(separation of substances that are not degradable into water and which are composed of
larger particles), consisted of one (1) peristaltic dosage pump with 4-20 mA, ppm, pulsing
and manual function, IP65 protection, one (1) polyethylene tank of 50L and one (1) fusion
system.
One (1) SEDIMENT EXTRACTION SYSTEM is included, with one (1) submersible pump to lay
down sediment, manufactured from stainless steel A/INOX, drive pump containing corridor
for transition of free solid substances up to 50 mm, engine power of 1.2 kW, engine
insulation of Class F and IP68 protection, high efficiency IE3, system is included for automatic
plug in with mechanism for attaching and handling for easy installation and maintenance.
CONTROL BOOTH, profiles of frame and metal sheet produced from carbon steel, with width
of 2 mm, 4-layer indoor and outdoor foundation (abrasive cleaning of the metal surface,
epoxide and polyester enamel, final layer by using imprint treatment), with two (2) access
doors, with lock system assembled, with ventilation system. Inside the control booth, there
are electric locker, blower and dosage system installed.
INSTRUMENTATION composed of one (1) electro-magnetic flow measurer without movable
part, with signal of 4-20 mA, PN10-16 and max.: Tº 80ºC, IP65 protection, for fast
measurement and fully clarified water during the flow. Circuit breakers for the operation
level, with start/stop buttons and for protection of electro-mechanic equipment.
ELECTRIC BOOTH made of carbon steel with anti-corosion layer, with simplex current,
transformer, circuit breakers, RCD protection (device for residual current), starters, relays
and contactors, circuit breakers for switch off and urgent switch off button, emergency kit
and cables for proper installation, pursuing the standards.
MANAGEMENT AND AUTOMATISATION SYSTEM, including PLC and HMI touch panel, with
special vigilance software, history recording, alarms and alerts and automatic control of the
submersible pump, sediment pump, detailed thorough recording system for oxygenisation,
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
with communication protocol with the central management system and available remote
control.
For the required operation capacity, one (1) plant was envisaged. To protect buildings from
river outflow, anchoring central plants with concrete panels was envisaged.
It is recommended that the Investor develops project documentation related to the
protection of the plant from water outflow from the riverbed (e.g. embankments, support
walls, or alike).
Following the treatment in the container plants, the sediments is headed into a sediment
density basin 10m3, and the clean water is discharged into the recipient. The dense
sediment from the basin is periodically transported with a cistern to an external site.
The entire upurified water (from outflows, discharge, etc.) is returned back to the pump
station, where it is sent back in the purification process.
The plant is automates and works without supervision. The Operator should periodically add
the needed chemicals (polymers) necessary for condensation of sediments.
SOURCE: Sanitary wastewater – wastewater coming from residential areas.
Basic characteristics:
• High level of suspended substances
• High level of organic matters
• High level of microbiological activities
• Content of fats and oils, max. 50 mg/l
QUALITY: The wastewater characteristics are equalised with the communal water
composition.
Book of Regulations on the conditions, manner and limit values of the discharge emission of
wastewaters after their purification, the manner of their calculation, given the special
requirements for conservation of protected areas (Official Gazette of RM nr. 81/11).
The adopted quality of collection sanitary-faecal wastewaters, if compared to the quality of
wastewater that is allowed to be discharged into the recipient, indicates that during the
purification treatment, it is of utmost importance to reduce the content of specific
substances.
Table. Comparative parameters for necessary level of purification
Parameter
Expected
concentration into
the wastewater
Limit values of
emission
Required level of
purification RLP (%)
pH 7,0 6,5 – 9,0 /
Temperature / 30 /
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
Suspended substances 367 35 90.5%
Deposit / 0,3 /
HPK 800 125 84,3%
BPK 400 25 93,8%
Total of fats and oils 120 20 83,3%
Total of chlorine 0 0,4 0%
Total of nitrogen 70 10 85,7%
Ammonia nitrogen 40 10 75%
Total of phosphorus 16 2 87,5%
Basic structure of planned solution consists in the following components:
1. Egalisation reservoir V=50m3, made of reinforced concrete.
2. Compact container plant consisted of the following processes:
• Raw wastewater pump
• Fine automatic grid
• Biological reactor MBBR
• Dosage of flocculants
• Lamella separator
• Density basin and supplementary sediment stabilisation.
Based on the quality criteria of purified water and expected characteristics of raw
wastewater, selective and gradual process is recommended, ensuring efficient elimination of
pollution and maximum perseverance of installed equipment.
The central plant is a device relying on MBBR technology.
MBBR reactor is adaptable and flexible solution assisting the users to achieve requested
objectives. The MBBR process is based on floating biofilm carriers, which are in continuous
movement under aeration conditions inside the reaction reservoir. The biofilm carriers
ensure protected surface for growth and development of heterotrophic bacteria (those
using organic bounded carbon for their growth) and autotrophic bacteria (those using non-
organic bounded carbon) inside the cells. Compared to the traditional treatment manner,
this method requires less maintenance and considerably smaller space. Not needing return
of active sediment in the process, the operation is considerably simplified, and the process
efficiency is considerably increased.
Basic features:
• Compact wastewater treatment plant
• Moving Bed Biological Reactor (MBBR)
• Modular implant, simple to transport and superstructure
• The installation is above the earth level
• Automatic operation.
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
BASICS OF THE SYSTEM OPERATION
The MBBR process is relying on floating biofilm carriers, which are in constant movement
under aeration conditions inside the reaction reservoir. The biofilm carriers ensure
protected surface for growth and development of heterotrophic bacteria (those using
organic bounded carbon for their growth) and autotrophic bacteria (those using non-organic
bounded carbon) inside their cells. Compared to the traditional treatment manner, this
method demands less maintenance and considerably smaller space. Not needing return of
active sediments into the process, the operation is considerably simplified, and the process
efficiency is considerably increased.
Table. Comparison with the active sediments process
MBBR Process with active sediments
Microorganisms are attached on carriers
(biofilm)
Biomass concentration: 9.000 mg/l
Biofilm density is formed depending on the
organic compression
No re-circulation of sediment is needed.
Microorganisms are suspended into the
mixture
Biomass concentration: 2.500 – 3.500 mg/l
Intervention is necessary from an Operator
when the organic compression is changed.
Re-circulation of sediments is needed.
Image. Technological process scheme
Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
Image. Detailed technological process scheme
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
The wastewater treatment includes the following processes:
The pump positioned in the egalisation reservoir has been continuously supplying the process
with wastewater in a unified composition. In front of the entrance into the MBBR reactor, large
dirt is removed using colanders. The reactor contains a filling space populated with active
biomass, and the reactor itself constructively adjusts the process conditions. Removing the
extra sediments from the purified water is ensured with the lamellas of the separator, and the
sediments are transported using a sediment pump. Thanks to the high level of purification, the
effluent from the plant may be discharged into the natural watercourse, as it was aligned with
all the quality standards.
Characteristics of the MBBR plant for wastewater treatment:
• The biomass is developed on the carriers, which are in the suspended water mixture.
• Large surface compared to the volume: 650m2/m
3
• It was designed to guarantee transfer of oxygen and organic substances
• The biofilm density is controlled and maintained by continuous separation happening under the
influence of aeration and fusion
• The material of carriers cannot be damaged – there are plants that are old even 20 years, and
still using same carriers
• The two-level biological process (high and medium-size compression) enhances the efficiency
and adaptation in fluctuating inflow of raw water
• The ratio of capacity/space occupying the plant is maximised
• High flexibility in the operation: from 30% - 70% share of carriers in relation to the reservoir
volume.
Table. Efficiency of MBBR device depending on the quantity of the fill
Treatment efficiency Loading (g BPK5/m2 day)
75 – 80 %
80 – 85 %
85 – 90 %
90 – 95 %
95 – 100 %
20,0
10,0
6,0
4,5
2,5
Image. Fill of a biological reactor MBBR
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
Operation and maintenance:
• No qualified staff is needed
• Sediment production: 0,35 kg dry matter / kg HPK
• Reduced consumption of chemicals (necessary flocculants for clearance 2-4 ppm)
The plant includes:
• Reservoir for alignment of the wastewater composition, concrete, digged in. There are
wastewater pumps placed in the basin.
• Wastewater submersible pump
o Submersible pump made of stainless steel for water with dirt up to 50mm, equipped for
assembling and easy handling.
• Fine colander
o Automatic rotation colander with porosity of 3mm made of stainless steel.
• MBBR aerobe biological reactor
o Biological reactor (for high and medium-size stress), made of steel panels with width of
4mm, and FPR coating, and outdoor anticorrosive coating. Carriers included (filling in
30% to 70% of the total reactor volume), aeration system with blowers and air
distribution throughout HDPE/PVC pipes.
o Operation parameters:
� Pressure of raw water: 2 - 4 bars
� Outdoor temperature: 0 – 40 °C
� Water temperature: 5 – 30 °C
� Above-see-level height: 230m
� Content of fats and oils: max. 50 mg/l
• Flocculants dosage to split sediments from the cleaned water. Poly-electrolyte is highly anion
electrised and is dosed in the secondary depositor in a concentration of approximately 2.00
mg/l.
Baseline Wastewater Treatment Project in the village of Novo Konjarevo, Municipality of Novo Selo
• Lamella depositor
o Depositor made of steel panels with height of 4mm and FPR spread, and anti-corrosion
spread from the outdoor. Pack of lamellas for larger surface of PVC and dosed system
with flocculants for sediment conduction.
• Sediment discharge.
o Submersible pump made of stainless steel for cleaning wastewater from dirt of 35-
50mm equipped for assembling and easy handling.
• Sediment densification is done in the depositor with cone-shape bottom, with volume of 10m3,
one for each installed treatment line. The depositor is digged in right after the container plant.
• Automatisation
o PLC with touch screen and special programme to handle the plant. Monitor and control
of the pressure and watercourse.
• Electro-panel and receptacles.
o Metal locker with transformer, circuit breakers and engine starters. It covers conduct of
electro-distributor and electro-mechanical equipment.
• Standardised housing unit
o The entire needed equipment is assembled in the container housing unit.
top related