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Enhanced compounded mix multi-stage alternate wetland sewage treating process and apparatus thereof

A technology for artificial wetland and sewage treatment, applied in the direction of biological water/sewage treatment, water/sludge/sewage treatment, sustainable biological treatment, etc., can solve the problems of poor impact load resistance, long hydraulic retention time, nitrogen and phosphorus removal Poor capacity and other problems, to achieve the effect of strong impact load resistance, reduced floor space, and strong adsorption capacity

Inactive Publication Date: 2008-05-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The constructed wetland can effectively overcome the disadvantages of the prior art, such as poor nitrogen and phosphorus removal capabilities, long hydraulic retention time, large floor area, and poor impact load resistance.

Method used

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  • Enhanced compounded mix multi-stage alternate wetland sewage treating process and apparatus thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The main components of the multi-stage alternating constructed wetland are: five rectangular vertical flow wetland units, PLC programmable controller, water inlet / outlet solenoid valve, suction pump, water distribution system and connecting pipelines. The bed walls of the five wetland units are made of impermeable materials. Each unit is a mixed packing layer with a thickness of 55 cm, filled with dewatered sludge and gravel of different particle sizes, and filled according to the reverse particle size (see Figure 1). The water distribution pipes are distributed at 5-10cm on the surface of the composite filler, and the distribution is uniform. Local dominant plants such as reeds are selected as wetland plants.

[0014] Fig. 2 is the operating condition diagram of the present invention, and the stage operation time and residence time can be adjusted according to different water quality and water quantity requirements. The first wetland unit 1 is flooded, the second wetl...

Embodiment 2

[0019] Add domestic sewage with average concentrations of COD, ammonia nitrogen, total nitrogen, and total phosphorus at 130mg / L, 16.7mg / L, 17.6mg / L, and 1.75mg / L, and strengthen the composite filler multi-stage alternating wetland system for COD, ammonia nitrogen, and total The removal rates of nitrogen and total phosphorus are 95%, 90%, 89% and 98% respectively, and the average concentrations of COD, ammonia nitrogen, total nitrogen and total phosphorus in the treated effluent are 6.5mg / L, 1.67mg / L, 1.94mg / L, 0.04mg / L, reaching the sewage reuse standard.

Embodiment 3

[0021] Each wetland unit is filled with dewatered sludge from waterworks, gravel, crushed stone and soil. The wetland filling thickness is 45-65cm. The top layer of the bed is covered with soil. Reeds or local dominant plants are planted on the soil. A mud layer and a gravel layer, the bottom layer is an anti-seepage layer, and the particle size of the sludge layer decreases from top to bottom.

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Abstract

The invention relates to a wastewater treatment technology for manual wetland by using a reinforced compound stuffing in a multilevel shift process, which comprising the following steps: firstly, the wastewater is sent into a desilting basin unit to remove the sundries and suspended substances in the water body; secondly, the wastewater is sent into the wetland group unit to be purified and then discharged; wherein, the wetland group unit comprises a plurality of vertical current wetland units connected in series with each other and the wastewater is sent into the wetland units in sequence during the purifying treatment. When one wetland unit is in the process of purifying wastewater, the other wetland units are kept in an empty bed status. The invention has the advantages that firstly, the shift between the anoxic form and the aerobic form is realized in time and space, the denitrification capability of the wetland system is increased greatly and the problem that the bed is blocked due to the excess growth of the biomembrane on the stuffing carrier is avoided; secondly, the water quality of the effluent is favorable, the elimination efficiency of nitrogen and phosphorus is up to 95%, the effluent of the domestic wastewater treated by the technology can reaches the wastewater renovation standard; thirdly, the shock resistance loading ability of the system is high, the occupied area is small, the technology is not only suitable for domestic wastewater in urban areas, wastewater with high concentration nitrogen and phosphorus, but also applicable for lake and river water bodies which are seriously eutrophicated.

Description

1. Technical field [0001] The invention belongs to the technical field of sewage / waste water treatment, and in particular relates to a multi-stage alternating constructed wetland sewage treatment process of reinforced composite fillers and a device thereof. 2. Background technology [0002] Existing technology: Constructed wetland technology is a new sewage treatment technology developed in the past 20 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, and low maintenance technology. Constructed wetland technology can also green the land and improve the ecological environment, and is suitable for sewage treatment in scattered areas and small and medium-sized cities and towns. However, this technology still has problems such as unsatisfactory nitrogen and phosphorus removal effect, large floor area, easy clogging of fillers, reduced filtration capacity and oxygen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/32
CPCY02W10/10
Inventor 傅剑锋
Owner SOUTHEAST UNIV
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