A low-energy consumption desalination process for wastewater and an apparatus thereof
A technology with low energy consumption and waste water, applied in general water supply conservation, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of high energy consumption, achieve low energy consumption, high water production rate, and reduce energy consumption and cost effects
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Embodiment 1
[0052] The object of advanced treatment is coking wastewater after biological treatment, and the TDS (total dissolved solids) in the wastewater is about 1000mg / L.
[0053] The waste water 13 first enters the forward osmosis unit 1; the draw liquid of the forward osmosis unit 1 adopts 50g / L calcium bicarbonate solution, after passing through the forward osmosis unit 1, the waste water is concentrated to about 10g / L, and the water production rate is 90% %, the concentrated waste water 14 is discharged or disposed of; the calcium bicarbonate solution after absorbing moisture enters the neutralization reaction unit 2, and in the neutralization reaction unit 2, slaked lime (from the follow-up pyrolysis unit 6 , a small amount of supplementation) to react, the mixed solution after the reaction enters the subsequent precipitation unit 3; the supernatant in the precipitation unit 3 enters the subsequent filtration unit 4, and the filtered water 15 is reused;
[0054] Part of the sedim...
Embodiment 2
[0056] The object of advanced treatment is urban wastewater after biological treatment, and the TDS (total dissolved solids) in the wastewater is about 500mg / L.
[0057] The waste water 13 first enters the forward osmosis unit 1; the draw solution of the forward osmosis unit 1 adopts 10g / L calcium bicarbonate solution, after passing through the forward osmosis unit 1, the waste water is concentrated to about 6g / L, and the water production rate is 92 %, the concentrated waste water 14 is discharged or disposed of; the calcium bicarbonate solution after absorbing moisture enters the neutralization reaction unit 2, and in the neutralization reaction unit 2, slaked lime (from the follow-up pyrolysis unit 6 , a small amount of supplementation) to react, the mixed solution after the reaction enters the subsequent precipitation unit 3; the supernatant in the precipitation unit 3 enters the subsequent filtration unit 4, and the filtered water 15 is reused;
[0058] Part of the sedimen...
Embodiment 3
[0060] The object of advanced treatment is the concentrated brine from the reverse osmosis desalination station, and the TDS (total dissolved solids) in the wastewater is about 8000mg / L.
[0061] The waste water 13 first enters the forward osmosis unit 1; the draw liquid of the forward osmosis unit 1 adopts 120g / L calcium bicarbonate solution, after passing through the forward osmosis unit 1, the waste water is concentrated to about 48g / L, and the water production rate is 83 %, the concentrated waste water 14 is discharged or disposed of; the calcium bicarbonate solution after absorbing moisture enters the neutralization reaction unit 2, and in the neutralization reaction unit 2, slaked lime (from the follow-up pyrolysis unit 6 , a small amount of supplementation) to react, the mixed solution after the reaction enters the subsequent precipitation unit 3; the supernatant in the precipitation unit 3 enters the subsequent filtration unit 4, and the filtered water 15 is reused;
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