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Application of potamogeton crispus fermentation liquor to constructed wetland denitrification

A technology for artificial wetlands and fermentation broth, which is applied in the field of environmental engineering, can solve the problems that carbon source release cannot be effectively controlled, effluent water quality is easily affected by external temperature, and hydraulic retention time is long. The effect of reducing environmental hazards

Active Publication Date: 2014-10-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantages are that the release of carbon sources cannot be effectively controlled, the required hydraulic retention time is long, and the effluent quality is easily affected by the external temperature.

Method used

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  • Application of potamogeton crispus fermentation liquor to constructed wetland denitrification
  • Application of potamogeton crispus fermentation liquor to constructed wetland denitrification
  • Application of potamogeton crispus fermentation liquor to constructed wetland denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: Preparation of fermented sludge.

[0056] The fermented sludge used in the experiment was taken from the dehydrated residual sludge of a sewage treatment plant.

[0057] Prepare acclimatization medium with the following components: glucose 15g / L, NaNO 3 3.04g / L, KH 2 PO 4 0.44g / L, MgSO 4 ·7H 2 O0.96g / L, CaCl 2 0.72g / L, NaHCO 3 0.96g / L, MnCl 2 0.11g / L. Then put 2.5kg of dehydrated residual sludge from the sewage treatment plant into a 5L fermenter, add 4L of acclimatization medium, adjust the pH to 7.4, acclimate at 28°C for one week, and monitor and control the pH every day.

[0058] The fermented sludge in the following examples was prepared according to the above method.

Embodiment 2

[0059] Embodiment 2: the preparation of fermented liquid of Smilax chinensis.

[0060] The weeds used in the experiment were collected from Tianlai River, Xianlin Campus, Nanjing University. After collection, weigh 1.3kg of Smilax, crush it with a plant vermicelli machine, put it in a fermenter with a volume of 5L, and add 350ml of domesticated fermentation sludge and 3000ml of tap water at the same time, and adjust the pH to 7-8. The fermenter was placed in a water-proof constant temperature incubator, and anaerobically fermented at 30°C for 7 days. The fermented liquid was filtered to remove the residues of Smilax chinensis, and the filtrate was collected and stored at 4°C for later use.

[0061] The Smilax fermented liquid in the following examples was all prepared according to the above-mentioned method.

Embodiment 3

[0062] Example 3: The effect of adding the fermented liquid of Smilax chinensis on the denitrification effect of the constructed wetland.

[0063] The fermented liquid of Smilax was added as the additional carbon source of the horizontal subsurface flow constructed wetland. Under the conditions of different influent COD / N and different hydraulic retention time (HRT), the effluent water quality is shown in Table 2.

[0064] Depend on figure 1 , 2 It can be seen that under the three hydraulic retention times, TN, NO 3 - -N removal rate all increased with the increase of influent COD / N value. Influent COD / N = 0, that is, when no fermented scorpion was added, TN, NO at three hydraulic retention times 3 - -N removal rates are 4%-9% and 4%-14% respectively, indicating that the denitrification efficiency is very low at this time; when influent COD / N=8, TN, NO 3- -N removal rates were increased to 37%-74%, 68%-87%, respectively, and the nitrogen removal efficiency of the system ...

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Abstract

The invention discloses an application of potamogeton crispus fermentation liquor to constructed wetland denitrification. The potamogeton crispus fermentation liquor is prepared by draining off and grinding potamogeton crispus after collecting potamogeton crispus, then putting ground potamogeton crispus in a fermentation tank to be mixed with naturalized fermentation sludge, then adding water, carrying out constant temperature fermentation, and removing potamogeton crispus residues. The invention also discloses an application of potamogeton crispus fermentation liquor to constructed wetland denitrification. The method has the advantages of simplicity in operation, cheap and easily obtained raw materials, good denitrification effects and the like, and has important social, economic and ecological benefits.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to the application of a fermented fermented liquid of Smilax in artificial wetland denitrification. Background technique [0002] In recent years, the annual comprehensive assessment results of river water quality in the Taihu Lake Basin show that the water quality of 85.2% of the monitored sections cannot meet the requirements of Class III, and most of them are Class V or worse than Class V. Among them, the main pollutants exceeding the standard are ammonia nitrogen, permanganate index, dissolved oxygen, five-day biochemical oxygen demand, petroleum, total phosphorus and chemical oxygen demand. The continuous deterioration of water quality in upstream rivers and lake areas has directly led to an increase in the total amount of pollutants entering Taihu Lake. Affected by the increase of pollutants entering the lake, the content of TP and TN in the water body of ...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/34C02F3/28
CPCC02F3/06C02F2101/105C02F2101/16C02F2305/06C02F3/327C02F2103/007Y02W10/10
Inventor 杨柳燕陈乾坤焦一滢张权李丽陈旭
Owner NANJING UNIV
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