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Chemical treatment programme for disc-tube reverse osmosis (DTRO) plant


Industry

Municipal Utilities Sector

Type

Landfill leachate treatment plant

Task

To select the chemical treatment programme of ROptima products for landfill plant DTRO treatment

Water source

Landfill leachate

About the project

The plant is situated in the landfill territory. The leachate is collected by the trench system from 30 hectares of the landfill territory. This wastewater is highly contaminated by heavy metals and organic pollution, also contains significant amounts of dissolved solids (up to 8000 mg/l). Annual landfill leachate generation is up to 90 000 m3. After collection, this filtrate is treated in the disc-tube reverse osmosis plant. Treated leachate is piped to the wastewater treatment plant, while concentrated is returned to the landfill. Since the dissolved solids in this by-product are concentrated as many as 4 times, the salts precipitate in the landfill, thus not increasing the dissolved solids concentration in newly collected leachate.


Water treatment programme

An acidic and alkaline cleaner as well as antiscalant ROptima for disc-tube reverse osmosis plant


Main technical parameters of the object

Leachate treatment capacity 90 000 m3/year Recovery 75% (possible to reach 82%)




No.

Parameter

Unit

Raw leachate

Concentrate

1

pH

-

7.27

6.94

2

Conductivity

μS/cm

17880

51300

3

Total dissolved solids

ppm CaCO3

736

21626

4

Total hardness

meq/l

18

65

5

Calcium hardness

meq/l

14

60

6

Total M-alkalinity

meq/l

126

170

7

​Sulphate

ppm

526

23560

8

Silica

ppm

375

647


Summarise


Jurby WaterTech International experts conducted an analysis of technical literature, visited the plant, and gathered all necessary data and samples (leachate, concentrate, membranes) for successful water treatment program selection and development. The R&D laboratory ran a series of experiments to test and modify existing and create new formulations of products to match the required targets. According to the obtained results, acidic and alkaline cleaners for membranes cleaning and an antiscalant agent for leachate treatment were selected. Calculations, modifications, a clean-in-place (CIP) programme, and a leachate chemical treatment programme were done. Then the service engineers revisited the plant and performed the trial of membrane cleaning in the facility. The products showed good performance and the test results fitted the client’s requirements. After the CIP procedure, one membrane was taken out and it was seen that the major mineral and organic deposits were removed from it. The client’s needs were fulfilled 100 percent and more. The plant technologist and operator were extremely satisfied with the price and quality of ROptima® products.


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