Closed-Pipe Medium Pressure UV Disinfection for Wastewater

Closed-Pipe Medium Pressure UV Disinfection For Wastewater


The disadvantages of open channel disinfection include the large footprint required for the disinfection channels; the large number of low pressure lamps required; the difficulty in cleaning the lamps, which have to be either cleaned manually -  a laborious procedure - or physically lifted and moved to an acid bath; significant pressure drop; the danger of personnel being exposed to UV light; and the growth of algae in the open channels. Also, the hydraulic movement of liquids through open channels is not particularly turbulent, so some sections of the wastewater may not pass close enough to the UV lamps to receive the minimum required UV dose.
Closed pipe medium pressure UV systems, on the other hand, have a much smaller footprint, as the UV chambers are inserted into existing pipework; the number of lamps is much less as medium pressure lamps have a significantly higher UV output than low pressure lamps; the lamps are fitted with a mechanical wiper on their protective quartz sleeve which keeps them clean - something that is not possible with low pressure systems. Periodic chemical cleaning, if required, is simple and can be done 'in-line' without removing the lamps. Pressure drop is much less as the wastewater passes directly through the treatment chambers. In addition, as the chambers are completely enclosed there is no danger to staff; this also eliminates the problem of algal growth. In addition, lamp change-over is easy and can be done in minutes. The hydraulic design of closed-pipe systems also means the movement of wastewater through the treatment chamber is more turbulent than in open-channels, ensuring all the wastewater receives the minimum required UV dose by passing close to the lamps. 






Cleaning of quartz sleeves
A major factor to consider with UV wastewater treatment plant is fouling of the protective quartz sleeves surrounding the UV lamps. Suspended solids and minerals in the wastewater attach themselves to the sleeves and must be removed at regular intervals to ensure maximum UV output. This is something that happens to both low and medium pressure UV lamps, and in both open-channel and closed-pipe systems.
There are two main ways to control fouling: mechanical cleaning of the sleeves (with O-rings or brushes) or chemical cleaning with acids. Even when mechanical cleaning is used, the sleeves will still need to be chemically cleaned from time to time. As explained above, with open-channel UV systems the UV lamps must be physically lifted from the channel and transferred to an external chemical bath.






Advantages
There are several advantages of using UV water filtration system rather than a chemical 
disinfection solution (such as chlorination):
1.No known toxic or significant nontoxic byproducts
2.No danger of overdosing
3.Does not require storage of hazardous material
4.Adds no smell to the final water product
5.Requires very little contact time



Application
1. Food processing industry, including juices, milk, drinks, beer, practical oil and canned food.
2. Electronic industry.
3. Hospitals, various laboratory and high levels of pathogenic body water disinfection.
4. Households building, residential, office buildings, hotels, restaurants, water factories.
5. Purification and disinfection of shellfish, fish cleaning and disinfection
6. Military camp, field water supply system
7. Urban wastewater disinfection.
8. Swimming pool, other recreational water disinfection
9. Thermal power, nuclear power plant industrial, central air conditioning system cooling water.
10. Biological, chemical and pharmaceutical, cosmetics for the production of cooling water.
11. Sea water, fresh water breeding, aquaculture water
12. Agricultural water disinfection



UV specification
Ultraviolet light treatment is a widely recognized and proven method of disinfection of water and has several advantage over other disinfection methods such as chlorination, ozonation, etc. UV light does not add anything to the water, such as, undesirable color, odor, taste, or flavor, nor does it generate harmful byproducts. It adds only energy in the UV radiation. Also, UV disinfection requires only a fraction of the contact times required by other disinfection methods. It is fast, efficient, effective, economical and environmentally-friendly.

Principle of Operation
UV water disinfection system design has been carefully conceived to provide adequate germicidal dosage throughout the disinfection chamber. The dosage, as it applies to UV disinfection, is a function of time and the intensity of UV radiation to which the water is exposed. Exposure time is related to the flow rate, the higher the flow rate, the lower the exposure time or the lower the flow rate, the higher the exposure time. The UV intensity is the amount of energy, per unit time, emitted by germicidal lamp. The Dosage is the product of UV intensity and the exposure time.



Effectively treating water with higher concentration levels than listed above can be accomplished, but may require added measures to improve water quality to treatable levels. If, for any reason, it is believed the UV transmission is not satisfactory, contact the factory.
UV wavelength (nm)

DOSAGE is the product of intensity & time
Dosage=intensity*time=micro watt/cm2*time=microwatt-seconds per square centimeter
(μ W-s/cm2)
Note: 1000μ W-s/cm2=1mj/cm2(milli-joule/cm2)

As a general guideline, the following are some typical UV transmission rates (UVT)
City water supplies850-980‰
De-ionized or Reverse Osmosis water950-980‰
Surface waters(lakes, rivers, etc)700-900‰
Ground water(wells)900-950‰
Other liquids10-990‰

model	Processing capacity (Ton/Hour)	power (W)	inlet and outlet (inch)	working pressure (Kg/cm 2 )	malfunction alert for UV lamp	reactor dimension (cm) L×W×H	dimension of panel(cm)	anchor bolt  (cm)	overall weight (Kg)
YLCn-005	0.3	16	1/2"	6	matched	30×6×11			5
YLCn-008	1	25	1/2"	6	matched	47×6.3×11			10
YLCn-050	2	40	1"	6	matched	100×9×20	Φ8.9×25 (diameter×length)	69×4×Φ1	25
YLCn-150	6	80	1+1/4"	6	matched	100×11×23		69×4×Φ1	30
YLCn-200	8	120	1+1/2"	6	matched	100×15.9×30	Φ8.9×45 (diameter×length)	69×7×Φ1	35
YLCn-300	12	160	2"	6	matched	100×15.9×32		69×7×Φ1	40
YLC-050	2	40	DN25/1"	6	matched	100×8.9×30	25×30×12 (L×H×w)	60×4×Φ1	45
YLC-150	6	80	DN32/1 1/4 "	6	matched	100×10.8×30		60×4×Φ1	50
YLC-200	8	120	DN40/1 1/2 "	6	matched	100×15.9×40		60×7×Φ1	60
YLC-300	12	160	DN50/2"	6	matched	100×15.9×40		60×7×Φ1	70
YLC-360	15	200	DN65/2 1/2"	6	matched	100×15.9×40	50×78×25 (L×H×W)	60×7×Φ1	120
YLC-500	20	240	DN65/2 1/2"	6	matched	100×21.9×50		60×11×Φ1.2	130
YLC-600	25	280	DN80/3"	6	matched	100×21.9×50		60×11×Φ1.2	140
YLC-700	30	320	DN100/4"	6	matched	100×21.9×50		60×11×Φ1.2	150
YLC-1000	40	360	DN100/4"	6	matched	100×21.9×50		60×11×Φ1.2	160
YLC-1200	50	400	DN125/5"	6	matched	100×21.9×50		60×11×Φ1.2	180
YLC-1500	60	420	DN150/6"	6	matched	170×27.3×57		120×16×Φ1.4	210
YLC-2000	80	560	DN150/6"	6	matched	170×27.3×57		120×16×Φ1.4	220
YLC-2500	100	700	DN150/6"	6	matched	170×27.3×57	60×128×30 (W×H×T)	120×16×Φ1.4	275
YLC-3000	125	840	DN150/6"	6	matched	173×27.3×57		120×16×Φ1.4	300
YLC-4000	150	1120	DN200/8"	6	matched	173×32.5×65		120×20×Φ1.6	325
YLC-5000	200	1400	DN200/8"	6	matched	173×37.7×72		120×22×Φ1.6	350
YLC-7000	300	2100	DN250/10"	6	matched	175×42.6×80		120×24×Φ2.0	400
YLC-10K	400	2520	DN250/10"	6	matched	176×52.9×95	60×150×40 (W×H×T)	120×28×Φ2.2	475
YLC-15K	600	3080	DN300/12"	6	matched	176×78×110		120×32×Φ2.4	600
YLC-20K	800	3920	DN350/14"	6	matched	confirmed	confirmed	confirmed	confirmed
YLC-25K	1000	4760	DN350/14"	6	matched	confirmed		confirmed	confirmed