Quick-start unpowered biologically enhanced constructed wetland system suitable for treating domestic sewage and waste water in small towns

A technology of constructed wetland system and domestic sewage, which is applied in the field of fast-start non-powered bio-augmented constructed wetland system, which can solve the problems of random discharge and achieve the effects of reducing energy consumption, promoting growth and solving blockage

Inactive Publication Date: 2012-07-25
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system can effectively shorten the start-up time of existing constructed wetlands and improve the treatment efficiency in the start-up phase; try to solve the blockage problem of subsurface flow wetlands after a period of operation; reduce energy consumption in the process of water treatment; pay attention to the landscape effect of plant configuration and soil The role of animals in water treatment can improve the local ecological environment; and it can solve the problem of unused rural land in my country and domestic sewage being collected and discharged randomly without treatment

Method used

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  • Quick-start unpowered biologically enhanced constructed wetland system suitable for treating domestic sewage and waste water in small towns
  • Quick-start unpowered biologically enhanced constructed wetland system suitable for treating domestic sewage and waste water in small towns

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Quick-start non-powered landscape artificial wetland display system such as figure 1 shown.

[0022] Sewage first enters the reservoir (grit chamber) stage to remove impurities and suspended solids in the water, and then enters the wetland treatment unit. The wetland treatment unit is divided into three parts. The front part is a suspended biological packing bed, the middle part is a biological treatment subsurface flow wetland, and the rear part is a three-stage surface flow wetland. The three parts are connected in series. The entire wetland treatment system is designed and constructed according to the elevation difference of the terrain, so that the water inlet end is higher than the water outlet end, and the whole process runs without power.

[0023] The front suspended biological filler bed is 5-8m long, 1.5-2m wide, and 40-50cm deep. An impermeable membrane is laid on the bottom, and a pebble layer is laid on the impermeable membrane, with a thickness of 5-10cm; ...

Embodiment 2

[0027] By adding activated sludge to the filler during the construction of the constructed wetland, the start-up time of the constructed wetland is shortened from about 1 month to about 1 week, and the removal efficiency in the start-up stage is significantly improved, and the COD is increased by 10-20 %; total nitrogen increased by 10-15%;

[0028] Total phosphorus increased by 5-10%.

Embodiment 3

[0030] Sewage with the same concentration of pollutants passes through subsurface constructed wetlands with and without earthworms respectively. The experiment shows that earthworms have a certain influence on the content of organic matter in the constructed wetland. Through the physical and physiological effects of earthworms, the organic matter brought into the soil by sewage Removed by gut action of earthworms. The COD removal rate of some constructed wetlands with earthworms to treat rural domestic sewage reaches 83%-88%, and the BOD 5 The removal rate reaches 91%-96%, the SS removal rate reaches 85%-92%, and the organic matter removal rate effect is equivalent to that of ordinary activated sludge method. The nitrogen removal effect of earthworm wetland is obviously better than that of ordinary activated sludge method, and the removal rate of ammonia nitrogen reaches 55%-65%. Its effluent concentration is (12-20) mg / L, which can meet the requirements of national discharge...

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Abstract

The invention relates to the sewage treatment field, and particularly relates to a quick-start unpowered biologically enhanced constructed wetland system suitable for treating domestic sewage and waste water in small towns. The constructed wetland system comprises: (1) a sand basin; (2) a suspending biological packing bed, wherein an impermeable membrane is paved on the bottom of the bed; a pebble bed is paved over the impermeable membrane; suspending biological packing is arranged over the pebble bed; and the mixture of volcanic packing, ceramsite packing and soil is paved over the suspending biological packing; (3) a biological treatment subsurface wetland, wherein the bottom layer of the biological treatment subsurface wetland is an impermeable layer; a pebble bed is paved over the impermeable layer; a volcanic packing layer is paved over the pebble bed; and earthworms are put in the area; and (4) a surface wetland. The system can effectively shorten the start time of the existing constructed wetland, improve the treatment efficiency at the start stage, solve the problem of blockage of the subsurface wetland and reduce the energy consumption of the water treatment process; and the system emphasizes the visual effect of plant arrangement and the role of soil animals in water treatment.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular, the invention relates to a fast-start non-powered bio-augmented artificial wetland system suitable for domestic sewage and wastewater treatment in small towns. Background technique [0002] Constructed wetland sewage treatment technology is a sewage treatment technology developed in recent years. This technology is widely used in many fields such as sewage treatment and surface water pollution control due to its low energy consumption, low investment, simple maintenance and management. Constructed wetlands also have landscape effects, can improve the local ecological environment, and are suitable for domestic sewage treatment in residential areas, small towns and rural areas. However, this technology still has problems such as slow startup after completion, large footprint, and easy plugging of fillers. [0003] At present, the improvement of the constructed wetland sewage treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 李俊清刘峰梁文艳
Owner BEIJING FORESTRY UNIVERSITY
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