Filamentous fungi and method for recovering phosphorus in sludge by using filamentous fungi
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A filamentous fungus and sludge technology, applied in the field of sludge resource utilization, can solve the problems of long phosphorus treatment cycle, unstable effect, and low degree of resource utilization, and achieve easy subsequent disposal and utilization, regular appearance and structure, economical and practical strong effect
Active Publication Date: 2022-06-21
NANJING AGRICULTURAL UNIVERSITY
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[0007] Aiming at the technical problems of long treatment cycle, unstable effect, and low degree of resource utilization in the existing technology of recovering phosphorus from sludge by relying on acidophilic bacteria microbial method , the app
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Embodiment 1
[0049] This example uses filamentous fungi to extract phosphorus from liquid sludge and synthesize ferrous phosphate.
[0050] Sludge samples were collected from excess activated sludge discharged from a municipal sewage treatment plant in Nanjing, Jiangsu. The basic properties are shown in Table 1.
[0051] Table 1 Basic properties of sludge samples
[0052]
[0053] This embodiment deals with the above sludge, and the flow chart is as follows figure 1 shown, including the following steps:
[0054] (1) Preparation of inoculant agent: pick OU5 cells from the slant, insert into PDA growth medium, 25° C., shake and aerobic culture for 3 days, and obtain a solution containing 10 7 OU5 inoculum of spores / mL.
[0055] (2) Sludge treatment: Inoculate OU5 bacterial agent according to the volume ratio of 5% to the sludge slurry sample with a solid concentration of 3%, ventilate and stir at 30 ° C, and biologically treat it for 3 days. The sludge is disintegrated and acidified, a...
Embodiment 2
[0066] In this example, filamentous fungi are used to extract phosphorus and synthesize iron phosphate from sludge incineration ash.
[0067] The samples of sludge incineration ash were collected from a sludge incineration plant in Nantong, Jiangsu. The basic properties are shown in Table 2.
[0068] Table 2 Basic properties of sludge incineration ash
[0069]
[0070] The present embodiment deals with the above-mentioned sludge incineration ash samples, and the flow chart is as follows figure 1 shown, including the following steps:
[0071] (1) Preparation of inoculation agent: pick OU5 cells from the slant, insert into PDA growth medium, 35 ℃, shake aerobic culture for 3 days, and obtain a mixture containing 10 8 OU5 inoculum of spores / mL.
[0072] (2) Treatment of sludge: Inoculate OU5 bacterial agent into the mortar prepared by sludge incineration ash with a solid concentration of 5%, according to the volume ratio of 20%, ventilate and stir at 35 ° C for 3 days, and ...
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Abstract
The invention belongs to the technical field of sludge recycling, and relates to filamentous fungi and a method for recovering phosphorus in sludge by using the filamentous fungi. Aiming at the technical bottlenecks that in the prior art, extraction of phosphorus from sludge by a microbiological method mostly depends on the action of acidophilic bacteria, the treatment period is long, the effect is unstable and the recycling degree is not high, the filamentous fungus strain Talaromyces tracerspermus OU5 is rich in hypha structure and does not need to be added with any nutritional agent or acid-base medicament, and the method has the advantages that the method is simple, the cost is low, and the production cost is low. The DOM of the sludge can be directly used as a nutrient for rapid growth. The scheme also provides a method for recovering phosphorus from sludge by using filamentous fungi, the strain OU5 is inoculated in sludge, the three-dimensional space floc structure of the sludge is destroyed by using the dual effects of biological disintegration and biological acidification of the strain OU5, phosphorus in the solid phase of the sludge is released and enters the liquid phase, then the sludge floc rich in phosphate is obtained, and then the sludge floc rich in phosphate is dehydrated and separated, so that the phosphorus is recovered from the sludge by using the filamentous fungi. A phosphorus-rich water solution and a sludge cake are obtained. The filamentous fungi are efficient and stable in sludge phosphorus recovery and high in economic practicability.
Description
technical field [0001] The invention belongs to the technical field of sludge resource utilization, and in particular relates to a filamentous fungus and a method for recovering phosphorus in sludge. Background technique [0002] Phosphorus is an important nutrient element to maintain all life on earth, and belongs to a non-renewable strategic reserve resource. In recent years, with the increasing demand for phosphorus in industrial and agricultural production, the reserves of global phosphorus deposits are facing huge challenges, and the phosphate rock available for mining will be on the verge of exhaustion in the next 50 to 100 years. Sludge is the waste produced by urban domestic sewage treatment plants after purifying sewage. Due to the enrichment and concentration of phosphorus by microorganisms in the sewage treatment process, the total phosphorus content in the sludge can reach 1 to 5% (if it is further incinerated, the phosphorus content in the generated sludge ash ...
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