Constructed wetland system capable of enhancing denitrification

A constructed wetland system and wetland technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve problems such as large footprint, achieve enhanced denitrification, improve denitrification Function, the effect of accelerating electron transfer speed

Pending Publication Date: 2021-10-22
CHONGQING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, constructed wetlands have the problem of occupying an excessively large area. Therefore, in order to reduce the occupied area, it is necessary to improve the denitrification efficiency of constructed wetlands.

Method used

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  • Constructed wetland system capable of enhancing denitrification
  • Constructed wetland system capable of enhancing denitrification
  • Constructed wetland system capable of enhancing denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Construction of a Constructed Wetland System for Strengthening Nitrogen Removal

[0028] A constructed wetland system for enhanced denitrification, comprising a wetland substrate 2 and a wetland plant 1 (cattail), the wetland substrate is divided into bottom substrate 21, middle layer substrate 22 and top substrate 23 from bottom to top, and the cattail is planted In the top substrate, the planting density is 40 plants / m 2 , the bottom matrix is ​​a gravel layer with a thickness of 10cm, and the particle size of the gravel is 5-8mm. The matrix of the middle layer is biochar and gravel, the volume ratio of the two is 1:4, and the thickness is 20cm. The top matrix is A layer of gravel with a thickness of 10 cm.

[0029] Using different process conditions to prepare biochar, see Table 1:

[0030] (1) Harvest last year's cattail, dry to constant weight, pulverize, and pass through a 60-mesh sieve to obtain wetland plant biomass;

[0031] (2) Under a nitrogen at...

Embodiment 2

[0035] Embodiment 2 The enhanced denitrification effect of the constructed wetland system of the present invention

[0036] The constructed wetlands were divided into three groups, and each group had three parallel groups. One group without adding biochar was recorded as the blank group, the other group was added with unmodified biochar, which was set as the unmodified biochar group, and the third group was added with modified biochar. Sexual biochar, set as manganese modified biochar group, is the biochar of No. 2 sample in embodiment 1. Each constructed wetland is arranged in such as figure 2 In the reactor shown, in order to monitor the water quality. The operation mode of the constructed wetland is the intermittent operation mode, the hydraulic retention time HRT = 7d, the actual water intake volume is 11L, and the water intake is from bottom to top through the peristaltic pump. Generally, the water intake is completed within 10 minutes. After the cycle ends, in order to...

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Abstract

The invention belongs to the field of sewage treatment technology and environmental protection, and particularly relates to a constructed wetland system capable of enhancing denitrification. The constructed wetland system can strengthen denitrification and improve removal of nitrate nitrogen, so that the purpose of reducing the occupied area is achieved. The constructed wetland system comprises a wetland substrate and wetland plants, the wetland substrate is sequentially divided into a bottom substrate, a middle substrate and a top substrate from bottom to top, the wetland plants are planted on the top substrate, the middle substrate comprises biochar, and the biochar is prepared from the wetland plants. According to the constructed wetland system, nitrogen removal and organic matter removal can be enhanced, the wetland plants planted in the top layer substrate are utilized and prepared into biochar, the biochar is further applied to the wetland system, and the effect of maximum utilization of resources is achieved.

Description

technical field [0001] The invention belongs to the field of sewage treatment technology and environmental protection, and in particular relates to an artificial wetland system capable of strengthening denitrification. Background technique [0002] Constructed wetland is an ecological system built to simulate natural wetland and treat sewage. It has the characteristics of low construction cost, high efficiency and simple maintenance. Constructed wetlands mainly use substrates, microorganisms and plants to treat sewage through physical, chemical and biological effects, so that the quality of sewage flowing through constructed wetlands can be purified and discharged. [0003] In winter, the plants in the constructed wetlands need to be harvested in time due to maturity and withering. If not harvested in time or improperly disposed of after harvesting, it will cause secondary pollution; for example, patent CN103241838A discloses a method of using wetland harvesting plants to s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F101/16C02F101/30
CPCC02F3/32C02F2101/30C02F2101/163
Inventor 陈一蔡然张功良何强郭富成罗南王征戍聂敏
Owner CHONGQING UNIV
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