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Water treatment plant for fertilizers production company


Industry

Agrochemistry and Fertilizer Industry

Type

Water treatment plant

Task

The water treatment plant modernisation

Water source

Surface (river) water

About the project

Part of the river water is directed directly to the mechanical filters and filtered water is supplied as make-up water for the cooling system. Another part of river water is treated by clarifiers dosing lime combined with coagulation. The clarified water is filtered in mechanical filters. Filtered water demineralized by The Ion Exchange Packed-Bed filters. Ammonia and iron are removed from the process condensate by cation resin filters. Demineralized water and treated process condensate deionizing by MixedBed filters.


Plant Capacity

Deionized water 430 m3/h

Demineralized water 200 m3/h

Filtered water 130 m3/h




River water

Parameter

Unit

Value

Parameter

Unit

Value

Total Hardness

meq/kg

4 ÷ 4.7

Mg2+

mg/kg

15 ÷ 20

Alkalinity

meq/kg

3 ÷ 3.8

Phosphates

mg/kg P2O5

0.15 ÷ 0.18

BOD

mg/kg O2

8 ÷ 9

Silicates

mg/kg SiO2

5 ÷ 9

NH4+

+ NH3

mg/kg N

0.2 ÷ 0.5

Salinity

mg/kg

220 ÷ 280

NO2– + NO3–

meq/kg

2 ÷ 3

​​Suspended Solids

mg/kg

6 ÷ 12

Cl-

meq/kg

10 ÷ 16

pH

6.5 ÷ 7.5

SO4 2-

meq/kg

25 ÷ 35

Conductivity

mS/cm

400 ÷ 480

Fe3+

meq/kg

0.3 ÷ 0.5

Temperature

°C

4 ÷ 20

Ca2+

meq/kg

25 ÷ 50

Flow rate

m3/h

800


Steam condensate

Parameter

Unit

Value

NH3

mg/kg N

≤0,500

Fe3+

mg/kg

≤0,050

Cu2+

mg/kg

≤0,020

Silicates

​mg/kg SiO2

≤0,030

Conductivity

​mS/cm

≤ 2

Temperature

​°C

<50÷60

Flow rate

​t/h

<220


Process condensate

Parameter

Unit

Value

NH3

mg/kg N

​≤10

CO2

mg/kg

≤15

Organics

mg/kg CH3OH

≤30

Temperature

°C

40÷50

Pressure

bar

3,7

Flow rate

m3/h

120


Effluent water parameters

Parameter

Unit

Demineralized water

Deionized water

​Silicates (SiO2)

​mg/kg

<40

20

Fe

​mg/kg

<50

30

Cu

​mg/kg

<20

20

NO2– + NO3–

​mg/kg

<20

20

pH

<8.5

​6.5÷7.5

Conductivity

mS/cm​

<2

0.5

Flowrate

t/h

200

430



Summarise


The modernisation of the existing clarifiers was provided in this project. It became possible to achieve suspended solids concentration of up to 2mg/l in the clarified water. Because of this working cycle and service life of mechanical and Ion Exchange filters will be extended. Reduced service water and reagents consumption allow our customer to save money.

Modernizing the water treatment plant our engineers make a decision to replace classic Ion Exchange filters with the Ion Exchange Packed-Bed technology. This technology makes it possible to achieve better water demineralization results, reduce the amount of water and reagents consumed for filter regeneration.


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