Bar screen and screening water treatment is the first process unit operation used at wastewater treatment plants. Screening removes objects such as rags, paper, plastics and metals to prevent damage and clogging of downstream equipment and piping.Cleaning frequency depends on the characteristics of the wastewater entering a plant.
Bar Screen Operation and maintenance considerations
Check and clean the bar screen at frequent intervals.
Do not allow solids to overflow /escape from the screen bar screen
Ensure no large gaps are formed due to the breakage of the screening water treatment.
Replace breakage bar screen immediately.
Mechanically cleaned screening system to remove larger materials because they reduce labor cost and they improve flow conditions and screening capture.
Mechanically cleaned bar screen should have a standby screen to put in operation when the primary screening device is out of service.
Trouble Shooting of screening water treatment
S.NO
PROBLEM
CAUSE
1
Large particles pass through and check the pumps
Poor operation /screen damaged
2
Up stream water levels is much higher than down stream level
Poor operation (inadequate cleaning)
3
Excessive collection of trash on screening water treatment
Poor operation
4
Excessive odor
Poor operation /trash disposal practices.
Daily and weekly maintenance work
Check gear box oil qty periodically and completely drain out oil and replace afresh as per manufacture’s recommendation.
Check oil pump every day ,top up if necessary
Check every day chain alignments and must periodically 4 hrs once chain cleaned or removed impurities materials.
Main use of screening water treatment
To remove the suspended solids
To avoided the pump cloaking
To increase the Bacteria attachment in the FBBR system
To avoided the solids cloaking in the air distribution system in Equalization tank
To increase the air volume in Equalization tank
Project Brief of screening water treatment plant
Auto is engaged into printing of textile garments using pigments and reactive colours. The Effluent Treatment Plant is designed to treat 40m3 per day of the effluent to achieve the norms prescribed by the local governing bodies and BSR guidelines. The Factory presently produce only up to 10m3/Day Effluent. The ETP is designed for higher capacity considering the future expansion and addition of Washing Process.
Plan Capacity of screening water treatment plant
The Effluent screening water treatment Plant is designed to treat wastewater generated from the processing unit. The Effluent treatment plant is designed to treat 40m3/day of Washing & Printing combined effluent generated from the process house (Washing 15m3/Day & Printing 5m3/Day). The plant will be capable of operating at the flow rate of 2m3/hr. The Present Effluent generation is 10m3/Day and the Plant is operated for 10-12 Hours per Day with 50% flow rate.
Conclusion
The treatment plant is based on Electro-coagulation Treatment. Electrocoagulation system has distinct advantages for the treatment of Textiles industrial wastewater. EC Systems present high efficiency, easy operation and environmental compatibility this process involves generation of coagulants by electrolytic oxidation of a sacrificial anode (iron) by applying a direct current. The most widely used electrode materials in electrocoagulation process are iron. The hydrolyzed iron ions can form long chains of Fe-O-Fe-OH which may chemically adsorb a large amount of contaminants. Screening water treatment with bar screen is very essential for etp.
ETP is stand for Effluent Treatment Plant. It is used in sewerage and wastewater system. ETPS is very important for Garments and Textile Industry. ETP purify waste water comes from different industry like textile, garments, ternary, pharmaceuticals etc. The industrial effluent treatment plants involve different stages of treatment including physio chemical treatment and biological treatment flowed by tertiary treatment. ETP reduce the cost of environmental control, the principal activities undertaken by Ministry of Environment and Forest consist of protection of environment, in the framework of egislations directed by the United Nations Environment program (UNEP)
List of Equipment for Common Effluent Treatment Plant :
Bar screen
Collection Tank cistern
Equalization Tank
Flash Mixer with Polymer
Biological Oxidation Tank
Bar Screen :
Bar screen are very well matched for removing suspended and floating coarse from wastewater such as weed, reed and rags. Bar screen is first step of etps – effluent water treatment process.
Bar Screen
Feature of Bar Screens:
Heavy accumulation of screening managed easily water pollution,
No moving parts permanently under sewerage
It is the process of cistern,
Confident engineering use bar screens
All unit easily accessible for lubrication of bar screens.
Collection Tank:
It is primary tank where wastewater stored from different section like dyeing, washing, knitting, finishing etc. Wastewater treatment plant is same meaning of effluent water treatment process.
Collecton tank
Equalization Tank for Effluent Treatment Plant in Textile Industry :
After primary mixing, the liquor passes to equalization tank by mixing of effluent from various process takes place
Equalization tank
Polymer Mixing Systems :
In flash mixer alum works upon sludge so that postponed solids settle down in etps. A polymeric material having a large number ion exchange sites. Generally polymer mixer is general system which is used in ETPs as flocculants and on some occasions as coagulants. Polymer mixing systems can be classified in 3 types e.g. cationic, anionic and nonionic polymer mixer.
Biological Oxidation Tank:
oxidiation
Echo system installed here. It is the last process of biological oxidation. ETP system use biological oxidation system, physical and chemical treatment process. Industrial water treatment and water recovery is the process for good environment.
ANNEXURE 1 TO PI NUMBER CEPL/BD/ATL/01 DATED
S.No
Description
quantity
BRAND
Acid dosing pump of PP construction
2 nos (1W + 1S)
SURYA
Fine Bubble Vertical Diffusers.
600 nos
IFU, GERMANY
FBBR Random Bio-Media
30m3
CONFIDENT
Effluent Feed Pumps (With motor and accessories)
2 nos. (1W + 1S)
JOHNSON / KIRLOSKAR
Secondary Clarifier Mechanism and FRP Well.
1 set
CONFIDENT
Sludge Re-Circulation Pump.
2 (1W +1S)
JOHNSON / KIRLOSKAR
Motorised Rotary Bar Screen
2 Nos.
CONFIDENT
Motors for Blowers
5 nos
ELGI / KIRLOSKAR
Electro coagulation skid
3 nos (2W + 1S)
CONFIDENT
Polymer dosing pump of PP construction
2 nos (1W + 1S)
SURYA
Flash mixer
1 set
BONFIGLIOLI
Effluent Feed Pumps
4 nos (2W +2S)
JOHNSON / KIRLOSKAR
HRSC Clarifier Mechanism and FRP well.
1 set
CONFIDENT
Screw pump
2 nos.
HYDRO PROKAV
Filter press
1 no.
HYDRO PRESS
PH indicator & controller
1 no.
COUNTRONICS
Level controller
4 nos
MINILEC
Temperature indicator
2 nos
SELECTRON
On-Line DO meter
1 no
INSTRONIX
Inverter for Effluent Pumps
2 nos
YASKAWA
Inverter for Aeration tank Blowers
2 nos
YASKAWA
Lab Accessories
1 set
REPUTED
Digital TDS meter
1 no
REPUTED
Digital Portable pH Meter
1 no
REPUTED
Digital Portable DO Meter
1 no
REPUTED
PIPE LINES, VALVES AND ACCESSORIES
ASSORTED
27.
ETP panel with PLC and D.C. pulse Power controller from CROSBY Controls, UK., Inverters and control Accessories.
3 sets
CONFIDENT
CROSBY, SCHNEIDER, IDEC, SIEMENS
Screw press dewatering is better than general effluent treatment plan.
