Two-stage DTRO system process
The membrane system is a two-stage reverse osmosis, the first stage reverse osmosis requires water from the core filter, and the second stage reverse osmosis treatment first stage permeable water.
The water from the raw water storage tank is supplied to the reverse osmosis equipment by the pump PK00211, and the sand filter booster pump PK13011 provides pressure to the raw water. There are 1 sand filter, FS13011. There are pressure gauges at the inlet and outlet of the sand filter. When the pressure difference exceeds 2.5 bar, the backwashing procedure must be performed. The frequency of backwashing of the sand filter depends on the suspended solids content of the incoming water. In the backwashing, the air pump RK13811 is used for air washing, and then the pump PK13011 is used for flushing. The filtering efficiency of the sand filter is 50 μm. After passing through the sand filter, the raw water directly enters the core filter. The equipment is equipped with two core filters, and there are pressure gauges at the inlet and outlet ends. When the pressure difference exceeds 2.0 bar, the filter element is replaced. The core filter has an accuracy of 10 μm to provide the last protective barrier for the membrane column. In order to prevent the formation of scale phenomenon due to high concentration of various poorly soluble sulfates and silicates in the membrane module, the membrane life is effectively extended, and a certain amount of scale inhibitor is added before the first-stage reverse osmosis membrane. The amount added is determined by the concentration of the poorly soluble salt in the raw water.
The raw water passing through the core filter directly enters the first-stage reverse osmosis high-pressure piston pump.
The DT membrane system has a shock absorber behind each plunger pump to absorb the pressure pulses generated by the high pressure pump to provide a smooth pressure to the membrane column. The effluent after the high pressure pump enters the membrane module, and the membrane module adopts the tube-type reverse osmosis membrane column, which has the advantages of strong anti-pollution and good material exchange effect, and has strong adaptability to leachate, and the first-stage DTRO membrane can reach For more than 3 years, the life of the secondary DTRO membrane is as long as 5 years. The first-stage reverse osmosis system is proposed to be two sets, which is a series connection mode. The first group of reverse osmosis concentrated liquid enters the second group after the series connection, and the COD concentration and salt content of the concentrated liquid treated in each group increase sequentially. A set of two-stage reverse osmosis.
The first stage reverse osmosis shock absorber effluent enters the first membrane group (FM161), the first group is directly supplied by the high pressure pump, and the second group membrane column is equipped with an online circulation pump to generate sufficient flow and flow rate to overcome the membrane. Pollution; the second-stage reverse osmosis does not require an online booster pump. Because of its low water conductivity and high recovery rate, only high-pressure pumps can meet the requirements.
The membrane column has two parts of water. The permeate of the first stage reverse osmosis is discharged to the inlet end of the second stage reverse osmosis, and the concentrate is discharged into the concentrate storage tank. The second-stage reverse osmosis permeate enters the clean water storage tank and is awaiting reuse. The concentrate enters the first-stage reverse osmosis inlet for further processing. The two-stage reverse osmosis concentrate has a pressure regulating valve (VS1601 and VS2601) for controlling the pressure in the membrane group to produce the necessary water recovery.
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