Treatment method of wastewater with high salt content and treatment device thereof
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A treatment method and technology for wastewater treatment, which are applied in the fields of degassed water/sewage treatment, neutralized water/sewage treatment, and water/sewage multi-stage treatment. Reduced operating costs, improved system water recovery, and improved recovery effects
Active Publication Date: 2010-08-11
BEIJING E & E TECH
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[0007] Due to the above-mentioned deposition of dissolved solids in water on the reverse osmosis membrane, the existing reverse osmosis treatment process can generally produce about 75% of product fresh water and about 25% of reverse osmosis concentrated water. Since the concentrated water accounts for 1 / 3 of the entire influent 4. In the actual application of the reverse osmosis system, the amount of concentrated reverse osmosis water is also considerable. This part of the wastewater cannot be recycled and can only be discharged
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Embodiment 1
[0077] Pilot test situation of treating high-salt wastewater on-site in a power plant:
[0078] 1. Pilot test water source: cooling tower circulating sewage.
[0079] 2. Pilot test water quality:
[0080]
[0081] 3. Drug specification for pilot test:
[0082] Name Purity
[0083] Slaked lime 85%
[0084] Polyiron (flocculant) 12% (calculated as Fe)
[0085] PAM industrial products
[0086] HCl 30%
[0087] NaClO 10%
[0088] NaCl industrial products
[0089] antiscalant concentrate
[0090] Reductant Industrial Products
[0091] NaOH 32%
[0092] 4 Pilot test equipment process:
[0093]
[0094] 5 Test Equipment Specifications
[0095] The design output of the pilot test equipment is 1~2m3 / h, and the main equipment parameters are as follows:
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Abstract
The invention provides a treatment method of wastewater with high salt content, comprising the following steps of: reducing the hardness and the permanent hardness of carbonate in the wastewater with high salt content, keeping the hardness of the carbonate in the wastewater with high salt content below 150mg/l and the permanent hardness below 300mg/l; adjusting the pH value of the wastewater with high salt content to be below 8.5; filtering precipitate in the wastewater with high salt content; exchanging the permanent hardness of the wastewater with high salt content by using a sodium ion exchanger; exchanging the hardness of the carbonate in the wastewater with high salt content by using a weak acid ion exchanger; removing carbon dioxide in the wastewater and keeping the index of the carbon dioxide in the wastewater with high salt content below 5mg/l; adjusting the pH value of the wastewater with high salt content to be below 8.5 again; and filtering the wastewater with high salt content by using a reverse osmosis device. The invention also provides a treatment device of wastewater with high salt content. The invention provides a treatment method of the wastewater with high salt content and a treatment device thereof, which can greatly improve the water recovery rate and save water for production and the consumption of common salt for generating the sodium ion exchanger.
Description
technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method and a treatment device for high-salt wastewater. Background technique [0002] At present, the reverse osmosis desalination process has been widely used in seawater desalination, reclaimed water reuse desalination and natural water desalination, etc., because the reverse osmosis treatment process requires the quality of influent water to be pollution index SDI<3, when water When using reverse osmosis to desalinate, a certain pretreatment process is required before reverse osmosis. At present, the typical pretreatment processes are: [0003] (1) clarification filtration + multi-media filtration + activated carbon treatment + reverse osmosis [0004] (2) clarification filtration + ultrafiltration / microfiltration membrane treatment + reverse osmosis [0005] (3) Biological aeration BAF + filtration + ultrafiltration + reverse osmosis [0006] No matter how co...
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