Oxygen-release material for ground water in situ aerobic bioremediation, and preparation method for the same
An aerobic biology and groundwater technology, applied in the direction of aerobic process treatment, sustainable biological treatment, etc., can solve the problem of unsatisfactory oxygen release time, achieve the effect of increasing aggregation, obvious effect, and improving structural characteristics
Inactive Publication Date: 2012-02-01
BEIJING UNIV OF TECH
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[0008] The above research shows that ORC is feasible in the aerobic bioremediation of groundwater, but the oxygen release time is not ideal. Oxygen-releasing materials have great practical significance
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[0030] The oxygen-releasing material of the invention will be specifically described below in conjunction with examples, which are not intended to limit the protection scope of the present invention.
[0031] 1.1 Materials and instruments
[0032] Calcium peroxide: food grade, 70% purity, the main impurity is Ca(OH) 2 (Beijing Jinnuo Xincheng Chemical Co., Ltd.).
[0033] Bentonite: Natural sodium bentonite.
[0034] Sand: natural river sand, particle size <2mm.
[0035] Cement: P.S.A32.5 slag portland cement (type A), 20% < slag content ≤ 50%, compressive strength ≥ 32.5MPa.
[0036] Precision acidity meter, six-connected stirrer, portable dissolved oxygen rapid tester (Hana HI9146), electronic balance.
[0037] 1.2 Preparation of three different oxygen-releasing materials
[0038]1.2.1 Oxygen-releasing material without bentonite (comparative material)
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Abstract
The invention discloses an oxygen-release material for ground water in situ aerobic bioremediation, and a preparation method for the same, belonging to the field of oxygen-release material. The oxygen-release material is composed of the following component parts by weight: 11-14 parts of edible calcium peroxide by weight, 10 parts of sodium bentonite by weight, 1-3 parts of monopotassium phosphate by weight, 2-6 parts of ammonium sulfate by weight, 15 parts of river sand by weight and the coagulant (the rest), wherein total weight of the above materials is 70 parts by weight. The preparation method comprises the following steps of: weighing the calcium peroxide, the sodium bentonite, the monopotassium phosphate and the ammonium sulfate, fully mixing and uniformly dispersing the weighed materials; adding the cement and the river sand, adding water after mixing the cement and the river sand uniformly to prepare the mixture into a massive material, and naturally drying by air. The oxygen-release material has high total oxygen-release quantity and smooth oxygen-release speed, effectively prolongs the oxygen-release time, and improves the change cycle of the oxygen-release filler. The pH value and nutrient substances, such as N, P and the like in the water all meet the requirements on growth of aerobic microorganisms.
Description
technical field [0001] The invention relates to an oxygen-releasing material for in-situ aerobic bioremediation of groundwater, in particular to a novel oxygen-releasing material suitable for in-situ aerobic bioremediation of groundwater and a preparation method thereof, belonging to the technical field of oxygen-releasing materials. Background technique [0002] Groundwater, as a source of water supply and an important support of the ecosystem, is an indispensable guarantee for maintaining a virtuous cycle of the water system (Hao Hua, 2004). However, with the intensification of environmental pollution, the problem of groundwater pollution has become increasingly prominent. Aiming at the remediation of groundwater pollution, developed countries have carried out a lot of research and application (Grete Rasmussen et al., 2002; Seunghak L et al., 2007), among which in-situ bioremediation technology has become the current method of remediation of polluted groundwater due to its...
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IPC IPC(8): C02F3/02C04B28/04
CPCY02W10/10
Inventor 张永祥梁建奎任仲宇井琦王然兰双双
Owner BEIJING UNIV OF TECH
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