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Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland

A technology of biochar and artificial wetland, applied in sustainable biological treatment, biological water/sewage treatment, biofuel, etc., can solve problems such as being easily affected by climate temperature, achieve high economic value and ornamental value, and solve land occupation Large area, the effect of improving phosphorus removal efficiency

Active Publication Date: 2015-05-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a simple and practical method of using biomass charcoal-constructed wetland coupling to treat phosphorus-containing sewage, which can effectively remove phosphorus in sewage, and at the same time solve the problems existing in the prior art. Issues such as the influence of climate temperature, disposal of aquatic plants, and re-release of saturated phosphorus adsorbed by substrates

Method used

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  • Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland
  • Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland
  • Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland

Examples

Experimental program
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Effect test

Embodiment 1

[0032] From March to April 2012, 1 / 3 of the area of ​​reed, calamus and cattail were planted on the soil layer of the constructed wetland. The pollen of cattails is collected from June to July. When the reeds and calamus are not completely withered and yellow in autumn, dig out the roots of the reeds, calamus and cattails, and make them into modified biochar. The specific steps are as follows:

[0033] (1) Air-drying and pulverizing the remainder of the aquatic plants into powder;

[0034] (2) the powder that step (1) obtains is in the MgCl that magnesium ion concentration is 0.8g / mL 2 Soak in 6H2O aqueous solution;

[0035] (3) Dry the mixed system obtained in step (2) first, then place it in a muffle furnace, keep it at 400-600°C (optimally stable at 500°C) for 1 hour, and cool to room temperature to obtain a carbonized product;

[0036] (4) Washing the carbonized product obtained in step (3) with water for 3 times, drying, grinding and passing through a 1 mm aperture sie...

Embodiment 2

[0039] Example 2: Determination of Phosphorus Removal Ability of Modified Biochar-Constructed Wetland

[0040] (1) select three kinds of aquatic plants of reed, calamus and cattail, air-dried and ground into powders with a diameter of about 2 mm, which are respectively recorded as l, C and K;

[0041] (2) The three powders in step (1) are equally divided into 4 parts, respectively in water, CaCl 2 Aqueous solution, MgCl2 6H2O aqueous solution and FeCl 3 Soak in aqueous solution for 2 hours to obtain C~CK, C~Ca, C~Mg, C~Fe, l~CK, l~Ca, l~Mg, l~Fe, X~CK, X~Ca, X~Mg and X~Fe12 group samples; wherein, the concentration of metal ions in the solution is 0.8g / mL;

[0042] (3) Dry each group of samples obtained in step (2) at 80°C, then divide them into 3 parts, put them into ceramic crucibles, wrap them with tinfoil paper after compaction and cover them, and put them in 400°C respectively , 500°C and 600°C muffle furnaces, kept for 1h, and cooled to room temperature to obtain carb...

Embodiment 3

[0048] Example 3: Modified biochar-constructed wetland coupled treatment of phosphorus-containing sewage

[0049] (1) Adopt the coupling system of biochar-underflow constructed wetland (such as Figure 4 ), the upper 30cm matrix is ​​the filler layer, and the lower 10cm is the water-repellent layer, wherein the matrix in the filler layer is soil+quartz sand+modified biochar (the mass ratio of soil, quartz sand and modified biochar is 5:5:1 , the soil is conventional paddy field soil, quartz sand grain size 0.5cm), and evergreen aquatic iris is planted, with a density of 13 plants / m 2 .

[0050] (2) In the step (1), adopt the water flow mode of upper water outlet and lower water outlet, and the hydraulic retention time is 72h. ;

[0051](3) Measure the concentration of total phosphorus and dissolved phosphorus in the influent and effluent. The concentrations of total phosphorus and soluble inorganic phosphorus in the influent are 0.163mg / L and 0.093mg / L respectively, and the...

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Abstract

The invention discloses a method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland, which comprises the following steps: growing aquatic plants on the soil layer of artificial wetland; collecting organisms in the harvesting season of the aquatic plants, and making the organisms into modified biomass charcoal; and adding the modified biomass charcoal into the artificial wetland, continuing growing the aquatic plants, and circulating like this. Compared with the prior art, the method solves the problems of high susceptibility to influence of climate temperature, aquatic plant treatment, phosphorus release of saturated-adsorption matrix, and the like, and especially has more obvious effect on phosphorus element treatment in the artificial wetland.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for coupling modified biomass charcoal and artificial wetland to treat phosphorus-containing sewage. Background technique [0002] Phosphorus is one of the main elements sustaining life in the earth system, and it is also an essential element that constitutes living organisms and participates in metabolic processes. The abundance of elements and the quality of phosphorus environment will directly affect the growth and development of all organisms including humans. In recent years, the water quality of rivers, lakes, oceans and other waters has deteriorated, especially the problem of eutrophication has occurred from time to time, and it is becoming more and more serious. Eutrophication not only makes the water body lose its proper function, but also makes the ecological environment of the water body evolve in a direction that is not conducive to human beings. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C10B53/02C10B57/10C10B57/06B01J20/20B01J20/30
CPCC02F3/32C02F2101/105Y02E50/10Y02W10/10
Inventor 杨柳燕李丽贾雯高斌王鑫
Owner NANJING UNIV
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