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desalination of seawater water filtration systems for 200TPD SWRO equipment in irrigation

desalination of seawater water filtration systems for 200TPD SWRO equipment in irrigation

Brand Name: KY
Certification: ISO9001:2008, CCS
Model Number: KYCT40-200
Minimum Order Quantity: 1set
Delivery Time: 90~100 working days
Payment Terms: T/T, L/C
Wisnex Aqua Fittings Co.,Ltd
Active Member
Guangzhou Guangdong China
Business type: Manufacturer Trading Company
Supplier`s last login times: within 19 hours

1. Introduction

The process and equipment covered by this scheme can satisfy to produce water for domestic use or agricultural irrigation as follows:

1.1 Production application: domestic drinking water and agriculture

1.2 System capacity: 200m³/d(25℃)

1.3 System recovery rate:40%

1.4 System configuration: pre-treatment, SWRO desalination unit (with energy recovery device) and assisting units.


2. Technological Process

Coagulant/bactericide reductant/anti-scalant

↓ ↓

Seawater →feed water pump→multimedia filter→5μm security filter→1μm security filter→HP pump→RO device(with energy recovery device)→fresh water tank


3. pretreatment equipment

(1)multimedia filter

The multi-media filter is to remove suspended solids and colloid particles in raw water. Coagulant is added by dosing pump before raw water entering into multimedia filter. Then flocculus formed by coagulant and colloids is removed through the filter, meeting the requirements on RO feed water (SDI15﹤5, turbidity﹤1NTU).

This system comprises of 2 sets of FRP filter with diameterφ1200*1850, and flow is 8-12m³/h. It is filled with refined quartz sand and anthracite with the height 1000mm. Multimedia filter is controlled by multi-way valve to automatically back washing.

(2)bactericide dosing

Bactericide is added into filter inlet pipes, and its dosage is controlled within free chlorine 0.1-0.3mg/L.

(3)coagulant dosing

When confirming coagulant types and dosage, it usually adds ferric or polyaluminium chloride, as well as polyacrylamid. Coagulant dosage is controlled within SDI<5 ( coagulant amount 5-10mg/L).

(4)reductant dosing

Adding reductant (sodium bisulfite) is to neutralize free chlorine, and it is added in the front of security filter or before RO system. Dosage is 2-3 times as much as free chlorine.

(5)anti-scalant dosing

Adding anti-scalant is to prevent carbonate and sulfate from scaling precipitation. It is added in the front of security filter and its dosage is around 5mg/L.


4. SWRO system

RO system mainly consists of double grade security filter, HP pump, SWRO membrane element, pressure pipe, and RO tank and connected instruments. This system adopts 1st pass SWRO process, and production flow is 200m³/d.

To prevent the particles in raw water and pipes from entering into HP pump and RO module, two security filters are selected one after another as RO pre-treatment. Precision of 2 sets of filters is 5um and 1um respectively. Under normal working conditions, filter element should be changed in time when the pressure difference between inlet and outlet of filter is above 1 bar. Filter structure can allow to change filter element rapidly.


5. HP pump

The pressure difference is the working power of RO device. Raw water is lifted by HP pump to the working pressure of RO, which is usually 5.0~6.0Mpa, making RO process stably operate, namely to overcome that seawater osmotic pressure, driving permeate water molecule through RO membrane into fresh water flow.


6. RO

①Membrane module

Membrane module of this system employs world advanced TFC composite membrane( “USA DOW”), which has high desalination rate and high flux of SW30-400 with dimension 8″×40″ as follows:

membrane model

effective area (㎡)

flux(L/㎡·h)

desalination rate

SW30HRLE-400

37

14.13

99.8


②Confirm of RO membranes

In order to reach the system recovery rate of around 40% , the first stage is selected with three branches of pressure vessels(each vessel containing four membrane elements), and the second is selected with one branch pressure vessel containing four membrane elements. There are sixteen membrane elements in the RO system.

(Ps: it is theoretically adopted 20membrane elements, but we take customer’s cost, placing space, etc into account, it is also ok to use 16 elements as long as system recovery rate up to 40%. )


7. Energy recovery device

iSave21 Pressure Exchanger devices actually includes energy recovery part and booster pump. They’re made of a high purity, aluminum oxide ceramic that’s corrosion-proof, three times more abrasion-resistant than steel, and provides unmatched durability. The simplicity and modularity of this design allows for optimum scalability, quick startup, and no required maintenance. The iSave21, can achieve greater than 95% energy recovery efficiency.

Model

No.

Flow

Efficiency

Power

iSave21

1 set

7-21m3/h

95%

5.5KW



Product Tags:

reverse osmosis water filtration system

      

desalination of salt water

      

slow sand water filtration

      

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desalination of seawater water filtration systems for 200TPD SWRO equipment in irrigation