Horizontal subsurface flow constructed wetland for treating polluted river water and low-concentration wastewater

Abstract

The invention relates to a horizontal subsurface flow constructed wetland for treating polluted river water and low-concentration wastewater. The horizontal subsurface flow constructed wetland comprises a reactor box body (1), a reactor water charging and distributing pipe (2), a water charging and distributing region porous clapboard (3), a water discharging region porous clapboard (4), a filler sampling port (5), a water discharging and collecting pipe (6), a water discharging hose (7), a fixed water level outlet (8), a zeolite or slag filler layer (9) and a gravel filler layer (10). A water charging and discharging region is provided with the porous clapboards, and one side of the water charging and discharging region, near to a treating unit, is covered with a bolting silk, so that the water charging and discharging distribution uniformity is improved, most of suspended particles in water can not enter a treating unit, and the blockage in a reactor is effectively delayed and weakened. The treating unit adds composite filler of the zeolite and gravel or adds the composite filler of the slag and the gravel, so that CODCr, ammonia nitrogen and nitrate nitrogen in the polluted river water or the low-concentration wastewater can be effectively reduced due to the synergistic effect of the filler and microorganism. The filler submerging depth is changed by adjusting the water level height of the water discharging hose, so that the ranges of an aerobic zone and an anoxic zone are adjusted, and the ammonia nitrogen and total nitrogen removing effect is improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a horizontal subsurface flow constructed wetland for treating polluted river water and low-concentration sewage. Background technique [0002] Constructed wetland is a water treatment technology that strengthens its purification ability through artificial construction and control based on the principle of natural wetland sewage purification. It is widely used in the treatment of raw domestic sewage, rainfall runoff, polluted river water and lake water, after secondary or tertiary treatment domestic sewage and low-concentration industrial wastewater. Constructed wetland treatment systems can be divided into the following types: (1) surface flow wetland system, (2) subsurface flow wetland system, (3) vertical flow wetland system. Although their structures are different, their mechanism of action basically includes adsorption, retention, filtration, redox, prec...

AI Technical Summary

Problems solved by technology

The constructed wetland treatment system has the characteristics of large buffer capacity, good treatment effect, simple process, low investment and low operating cost, but there are still many unsolved problems in the constructed wetland sewage treatment technology

[0003] Judging from the operation effect of the existing constructed wetland, there are still some deficiencies in its treatment of polluted river water and low-concentration sewage. First, the denitrification capacity is insufficient, and the treatment efficiency of nitrifying bacteria and denitrifying bacteria in the constructed wetland can also be improved. ; Second, the seasonal adaptability is not strong, and the treatment effect is poor under low temperature conditions; Third, in wetland systems that use natural soil as filler, there are often cut-off or dead flow phenomena; Fourth, after long-term operation of artificial wetlands Soil compaction forms a blockage, resulting in a decrease in treatment efficiency

Images