Method for advanced treatment of domestic sewage through combination of constructed wetland and vermi-biofilter (VBF)
A technology of domestic sewage and ecological filter, which is applied in the field of environmental engineering, can solve problems such as unreachable and environmental impact of natural water bodies, and achieve the effect of eliminating the impact of treatment effect
Inactive Publication Date: 2013-03-13
FUDAN UNIV
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Problems solved by technology
It can be seen that even if the sewage discharged by general sewage treatment plants meets the most stringent Class A standard in the pollutant discharge standard for urban sewage treatment plants (GB18918-2002), it still cannot meet the environmental quality standards for surface water (GB 3838-2002). 2002) is the worst category V water standard, so if the effluent of the sewage treatment plant is directly discharged without advanced treatment, it will have a negative impact on the natural water environment
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[0024] A method for advanced treatment of domestic sewage by combining a constructed wetland and an earthworm ecological filter. To build a combined system of constructed wetland and earthworm ecological filter with a processing capacity of 100 tons / day to conduct advanced treatment of domestic sewage in a certain community. Consider the VSFCW-VBF and VBF-VSFCW combination under the condition of three influent pollution load concentrations with C / N of 2.5:1, 5:1 and 10:1, to determine the best Constructed wetland and earthworm ecological filter are combined to treat actual domestic sewage.
[0025] The following are the specific steps:
[0026] VSFCW and VBF form two combinations of VSFCW-VBF and VBF-VSFCW. The composition of the packing layer of VSFCW is as follows: 20 cm thick gravel is arranged at the bottom of the wetland (the nominal average particle size is 1.65 cm), and 45 cm thick slag is arranged on the wetland (the nominal average particle size is 1.35 cm); the slag mus...
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Abstract
The invention belongs to the technical field of environmental engineering, and particularly relates to a method for the advanced treatment of domestic sewage through a combination of a constructed wetland and a vermi-biofilter (VBF). The method comprises the following steps: combining a vertical subsurface flow constructed wetland (VSFCW) and a VBF, thus forming a VSFCW-VBF treatment combination or a VBF-VSFCW treatment combination; using artificially synthesized domestic sewage as influent water, and simulating three concentrations, namely a carbon-nitrogen ratio (C / N) pollution load concentration, a medium C / N pollution load concentration and a high C / N pollution load concentration; testing pollutant removal effects of the VSFCW-VBF and the VBF-VSFCW under the conditions of different C / N pollution load concentrations in a whole year; and finally, comprehensively considering the chemical oxygen demand and the total nitrogen and total phosphorus removal rate, and determining an optimal combination to treat actual domestic sewage. The method provided by the invention can remarkably improve the advanced treatment effect of domestic sewage, is simple and easy to implement and convenient to operate and has good economic benefits.
Description
Technical field [0001] The invention belongs to the technical field of environmental engineering, and specifically relates to a method for advanced treatment of domestic sewage by combining a constructed wetland and an earthworm ecological filter. Background technique [0002] Generally, the treatment of domestic sewage must go through at least three steps: pretreatment, primary treatment and secondary treatment. The pretreatment usually uses grilles to remove the large debris that damages the equipment; the suspended solids in the wastewater generally undergo primary treatment, and the methods of interception, sedimentation and sedimentation can be used to remove solids such as sediment and a small amount of decaying organic matter. Removal; and colloidal impurities are mostly treated by a secondary treatment method, and most of the organic matter is removed at this stage. After primary treatment and secondary treatment, general sewage will meet the pollutant discharge standard...
Claims
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IPC IPC(8): C02F3/32
Inventor 郑正颜诚罗兴章张丽
Owner FUDAN UNIV