Method for realizing zero discharge and resource utilization of reverse osmosis concentrated water in coal chemical industry
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A reverse osmosis concentrated water, zero-discharge technology, applied in chemical instruments and methods, oxidized water/sewage treatment, inorganic chemistry, etc., can solve the problems of secondary pollution, high energy consumption, low treatment efficiency, etc., to reduce treatment costs. , the effect of high removal efficiency
Active Publication Date: 2020-04-17
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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Problems solved by technology
The salt washing method has problems such as low treatment efficiency and easy to produce secondary pollution; the high temperature treatment method has problems such as high treatment temperature, high energy consumption, easy melting, and low treatment efficiency; the landfill method has the problems of occupying a large amount of land, Easy to precipitate and cause secondary pollution and other problems
Therefore, there is a lack of effective and reasonable reverse osmosis concentrated water zero discharge and resource treatment methods
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Embodiment 1
[0033] The reverse osmosis concentrated water of a coal chemical water treatment unit is shown in Table 1 and processed through the following steps:
[0034] Table 1 Coal chemical reverse osmosis concentrated water indicators
[0035] project Ca Mg SiO2 COD TOC TDS Cl- SO4 2-
Value, mg / L 120 40 80 195 65 22000 7100 13200
[0036] (1) The reverse osmosis concentrated water first enters the hard and silicon removal unit, and then add softening agent and silicon removing agent. The softening agent is calcium hydroxide, sodium carbonate and magnesium oxide. L, Mg: 5mg / L, SiO 2 : 10mg / L.
[0037] (2) The effluent from step 1 enters the advanced oxidation unit to remove organic matter, and uses NaClO in the NaClO preparation unit to oxidize and remove organic matter in the wastewater. Dosing NaClO according to m(NaClO):m(COD)=2, the effluent COD is reduced to 92mg / L.
[0038] (3) The effluent from step 2 enters the nanofiltration un...
Embodiment 2
[0048] The reverse osmosis concentrated water of a coal chemical water treatment unit is shown in Table 1 and processed through the following steps:
[0049] Table 1 Coal chemical reverse osmosis concentrated water indicators
[0050] project Ca Mg SiO 2
COD TOC TDS Cl- SO4 2-
Value, mg / L 110 60 90 240 80 25600 16100 8100
[0051] (1) The reverse osmosis concentrated water first enters the hard and silicon removal unit, and then add softening agent and silicon removing agent. The softening agent is calcium hydroxide, sodium carbonate and magnesium oxide, and the Ca of the hard and silicon removing unit: 6mg / L, Mg: 4mg / L, SiO 2 : 12mg / L.
[0052] (2) The effluent from step 1 enters the advanced oxidation unit to remove organic matter, and uses NaClO in the NaClO preparation unit to oxidize and remove organic matter in the wastewater. Dosing NaClO according to m(NaClO):m(COD)=2, the effluent COD is reduced to 125mg / L.
[00...
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Abstract
The invention discloses a method for realizing zero discharge and resource utilization of reverse osmosis concentrated water in coal chemical industry. The method comprises the following steps: removing hardness and silicon from reverse osmosis concentrated water, carrying out advanced oxidation on the effluent to remove organic matters, feeding into a nanofiltration system, and separating salts to obtain sodium sulfate concentrated water and sodium chloride produced water; concentrating the sodium sulfate concentrated water by a concentrated water membrane, adding an oxidant, carrying out concentrated water hydrothermal concentration treatment, and carrying out potassium sulfate preparation treatment on the effluent to obtain a potassium sulfate product and a sodium chloride solution; andcarrying out water production membrane concentration treatment on the sodium chloride produced water, carrying out produced water thermal concentration treatment, and feeding the effluent into an ionic membrane electrolysis unit to obtain H2, Cl2 and a 30% NaOH solution, wherein H2 and part of Cl2 are used for preparing a hydrochloric acid solution, and part of Cl2 and part of the NaOH solution enter a NaClO preparation unit to prepare NaClO. According to the method, reverse osmosis concentrated water is pretreated to prepare the approximately saturated sodium chloride and sodium sulfate concentrated salt water without crystallization so as to reduce the treatment cost, and finally the concentrated salt water is prepared into acid-alkali and potassium sulfate with industrial values, so that resource utilization is realized, and the method has good application prospect.
Description
technical field [0001] The invention belongs to the field of advanced wastewater treatment, and in particular relates to a method for realizing zero discharge of reverse osmosis concentrated water in coal chemical industry and resource utilization. Background technique [0002] my country's energy distribution is characterized by more coal and less oil, and coal reserves are mainly distributed in the west. Most coal chemical projects are concentrated in the west where there is a lot of coal and water shortage. Reuse, reduce new water consumption, achieve about 75% high-quality water reuse, and produce 25% reverse osmosis concentrated water at the same time, most of the pollutants in the wastewater are trapped in the reverse osmosis concentrated water, if not directly discharged without treatment Entering environmental water will cause great pressure on the deterioration of the water environment in the area where the enterprise is located, seriously restricting the sustainable ...
Claims
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