A method for treating farm wastewater by using periphyton algae
A technology of periclump algae and farms, which is applied in the field of using periclump algae to effectively treat nitrogen and phosphorus in pig wastewater, and can solve the problems of removing nitrogen and phosphorus, difficulty in increasing periclump biomass, and difficulty in eutrophication. Realization and other issues, to achieve the effect of realizing a virtuous ecological cycle, simple design, and easy operation
Inactive Publication Date: 2019-04-02
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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Problems solved by technology
Although this technology has achieved certain results in controlling eutrophication in lakes, since the growth of periphytons requires sufficient light and nutrient conditions, the growth of periphytons in low nutrient levels or deep eutrophic lake waters will Therefore, it is difficult to realize the method of joint control of lake eutrophication by using scraping fish and periphyton, and there are still some problems in direct promotion and application.
However, there are no related reports on the use of periphyton algae to remove nitrogen and phosphorus in pig farm wastewater
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0019] The specific processing method adopted in the present embodiment is as follows:
[0020] First, choose a nylon net suitable for the growth of surrounding algae as an artificial substrate, and fix about 30 pieces of nylon nets (length and width: 50 × 30 cm, and net diameter: 1 mm) in a water depth of 0.3 to 0.5 m in the coastal zone of a eutrophic lake. At the bottom of the lake, after cultivating for 8-15 days, a nylon net with a large amount of algae attached to it was obtained. In the later stage of inoculating the periphyton algae, the pig manure wastewater from a pig farm in the suburbs of the city was placed in a cylindrical funnel-shaped sedimentation tank with a diameter and height of 1 and 2 m, respectively, and was allowed to settle for 4 to 8 hours. Move into another flocculation tank with the same specification and size, and add flocculant chitosan and sodium alginate (0.2-0.5g·L -1 ) for 20 to 30 minutes, filtered through the sewage filter, and then diluted...
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Abstract
The invention provides a method for treating animal farm wastewater by using periphytic algae. The method comprises the following steps: firstly, artificial substrates suitable for attaching the periphytic algae and easily retracted are put into a natural eutrophic water body, and the artificial substrates are inoculated with the periphytic algae in the water body; pretreated animal farm wastewater is discharged into an outdoor annular treatment tank, and then the artificial substrates attached with the periphytic algae are uniformly put in the annular treatment tank for 8 to 12 days, the periphytic algae with which the artificial substrates are inoculated on nylon nets can use sunlight to effectively remove nitrogen and phosphorus in wastewater while growing in animal farm wastewater, the removal rates of the total nitrogen, the total phosphorus and the COD are respectively 86.5-94.8%, 93.4-98.7% and 91.5-95.6% after animal farm wastewater is treated. Water purified by the method disclosed by the invention can be used for farm irrigation, landscaping and the like, and the treated periphytic algae are easily harvested, and can be used as fertilizers or feeds, so that a virtuous ecological cycle of wastewater can be effectively realized.
Description
technical field [0001] The invention belongs to the technical field of biological treatment of organic wastewater, and relates to a method for effectively treating wastewater from farms by utilizing periphyton algae, in particular to a method for effectively treating nitrogen and phosphorus in pig-raising wastewater by utilizing periphyton algae. Background technique [0002] With the development of livestock and poultry breeding technology, decentralized pig farming is gradually transforming into a large-scale pig production model. This large-scale centralized farming method will inevitably produce a large amount of pig manure wastewater rich in nitrogen, phosphorus and other nutrients and microorganisms. However, such large-scale pig farms are mainly built near cities and towns. Obviously, there is not enough agricultural land to receive the sewage. If it is discharged directly without treatment, it will inevitably lead to pollution and eutrophication of nearby lakes and ri...
Claims
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IPC IPC(8): C02F9/14C02F103/20C02F1/52C02F3/32
CPCY02W10/37
Inventor 裴国凤阎春兰夏爽
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES