Treatment method of membrane filtration concentrated solution
A treatment method and concentrated solution technology, which is applied in the field of membrane filtration concentrated solution, can solve the problems of high evaporation and adsorption operation costs, and the applicability of the final treatment process to be discussed, and achieve good effluent quality, small footprint, H2O2 Residue reduction effect
Active Publication Date: 2013-04-24
PETROCHINA CO LTD
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Problems solved by technology
It should be pointed out that drying and solidification is only suitable for the treatment of concentrated liquids with extremely high concentrations, and the operating costs of evaporation and adsorption are extremely high. Technical and economic applicability is still open to question
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[0027] A petrochemical company's sewage treatment and reuse unit adopts ultrafiltration-reverse osmosis double-membrane technology, and the treated water is reused as circulating cooling water and boiler make-up water. However, the COD of the membrane filter concentrate reaches 200mg L -1 Left and right, cannot be discharged directly. The present invention selects this membrane filter concentrated solution as the processing object, and adopts a 50L-scale Fenton oxidation-enhanced flocculation integrated treatment device for testing, and the treated water enters 1L h after collection. -1 BAF biochemical treatment unit.
[0028] Concrete operation steps and technological conditions are as follows:
[0029] (1) Fenton oxidation. select H 2 o 2 / COD (mass ratio) is 1.0, Fe 2+ / COD (mass ratio) is 0.5, the pH value is controlled at 4.0, the temperature is at room temperature (about 25°C), and the batch feeding method is adopted: the number of batches is 3 times, and the time i...
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Abstract
The invention relates to a treatment method of a membrane filtration concentrated solution. The method comprises the steps of: permitting the raw water of the membrane filtration concentrated solution enter the reaction container, adding H2O2 and Fe<2+> in 1-8 times, with the pH value controlled between 2.0 and 4.0; subjecting the mixed solution to an incomplete Fenton oxidation reaction for 30-360min; adjusting the pH value to a range of 4.0-6.0, stirring for 10-60min for flocculation; adjusting the pH value to a range of 6.0-9.0, leaving the mixed solution to stand and precipitate for 15-45min; putting the supernate into a biochemical treatment unit, and allowing the settled sludge to enter a sludge treatment system. The total adding amount of the Fenton reagent is determined according to the H2O2 / COD mass ratio of 0.5-4.5 and the Fe<2+> / COD mass ratio of 0.1-4.5. The medicine is added at an interval of 10-150min, and each time the mass added is about 33-100% of the the last time. The method of the invention has the obvious characteristics of simple equipment, small occupation area, low operation cost, high treatment efficiency, good effluent water quality, and the like.
Description
technical field [0001] The invention relates to a method for treating membrane filtration concentrated liquid by adopting a combined process of Fenton oxidation-flocculation-biochemical treatment. Background technique [0002] At present, membrane filtration units such as ultrafiltration, nanofiltration and reverse osmosis have been widely used in the field of advanced sewage treatment, and the resulting membrane filtration concentrate treatment problem has also proposed a new topic for environmental protection technicians. Since the COD concentration of the membrane filtration concentrate in the advanced sewage treatment is usually 150-600 mg L -1 Within the scope, follow-up treatment must be carried out to meet the emission standards. However, the main components of the membrane filtration concentrate are undegraded organic components and soluble microbial products (polysaccharides, proteins, lipids, etc.) in the upstream water, which are typical refractory organic wastew...
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IPC IPC(8): C02F9/14C02F1/72C02F1/52
Inventor 邓旭亮杜龙弟张春燕吴林美荣丽丽王桂芝刘长福郝丽王薇何昌洪邵正宏李群英
Owner PETROCHINA CO LTD