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Method using downflow biological aerated filter to treat algal slurry press filtrate

A technology of biological aerated filter and algae slurry, which is applied in biological water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., and can solve problems such as strong liver toxicity and secondary pollution of water bodies

Active Publication Date: 2013-08-14
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the death or rupture of cyanobacteria cells releases intracellular substances into the water body, resulting in high concentrations of COD, nitrogen, phosphorus, microcystin and other pollutants in the algal pulp press filter.
Nitrogen and phosphorus are one of the main factors that cause eutrophication of water bodies. Microcystins have strong liver toxicity and "three-caused" effects. If these pollutants are discharged directly without treatment, they will cause secondary pollution to water bodies.

Method used

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  • Method using downflow biological aerated filter to treat algal slurry press filtrate
  • Method using downflow biological aerated filter to treat algal slurry press filtrate
  • Method using downflow biological aerated filter to treat algal slurry press filtrate

Examples

Experimental program
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Embodiment 1

[0015] The influent pH value is 6.8; the downward flow biological aerated filter is 0.15m 3 / (m 2 The filtration rate of h) is used to hang the film, the temperature of the film is 15°C, the time of the film is 14d, the influent is domestic sewage mixed with 1% algae toxin-degrading bacteria liquid; the operating temperature is 15°C, the air-water ratio 0.5, flow rate 0.65 m 3 / (m 2 h); the backwash cycle is 7 days, the method is to aerate for 10 minutes first, and the aeration intensity is 50m 3 / (m 2 h), and then backwash with air and water for 10 minutes, and the water inlet flow rate is 15m 3 / (m 2 h), finally turn off the fan, keep the water inlet speed unchanged and only backwash with water for 10 minutes.

Embodiment 2

[0017] The influent pH value is 8.0; the downward flow biological aerated filter is 0.18m 3 / (m 2 The filtration rate of h) is used to hang the film, the temperature of the film is 30°C, the time of the film is 12d, and the influent is domestic sewage mixed with 0.9% algae toxin-degrading bacteria liquid; the operating temperature is 18-25°C, and the air The water ratio is 0.6 and the flow rate is 0.72 m 3 / (m 2 h); the backwash period is 7 days, the method is to aerate for 10 minutes first, and the aeration intensity is 55m 3 / (m 2 h), and then backwash with air and water for 10 minutes, and the water inlet flow rate is 16m 3 / (m 2 h), finally turn off the fan, keep the water inlet speed unchanged and only backwash with water for 10 minutes.

Embodiment 3

[0019] The influent pH value is 7; the downward flow biological aerated filter is 0.20m 3 / (m 2 h) for film-hanging, the film-hanging temperature is 20-26°C, the film-hanging time is 10 days, the influent is domestic sewage mixed with 0.8% algae toxin-degrading bacteria liquid; the operating temperature is 20-28°C , the air-to-water ratio is 0.7, and the flow velocity is 0.78 m 3 / (m 2 h); the backwash period is 7 days, the method is to aerate for 10 minutes first, and the aeration intensity is 55m 3 / (m 2 h), and then backwash with air and water for 10 minutes, and the water inlet flow rate is 16m 3 / (m 2 h), finally turn off the fan, keep the water inlet speed unchanged and only backwash with water for 10 minutes.

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Abstract

The invention discloses a method using a downflow biological aerated filter to treat algal slurry press filtrate, which includes that algal slurry press filtrate is inputted in an adjusting tank for precipitation, the filtrate is injected into the top of the downflow biological aerated filter and downwardly enters a filtering material layer in the filter, the filter is filled with clinoptilolite which is 4-6mm in particle size and modified by NaCl, a Roots fan is used for aeration to the filter material layer from the bottom end, membrane forming is performed at the filtering speed of 0.15-0.23m3 / (m2h), algal toxin degrading bacterial liquid with the accession number being CGMCC4498 is added in membrane forming inflow water and accounts for 0.5-1% of the inflow water in volume, water outputted from the downflow biological aerated filter flows into a water collection tank and pumped into the bottom of the filter for backwashing through a backwashing water pump, the backwashing water backflows into the adjusting tank through a pipeline from the top of the filter, settled sludge is inputted into a sludge thickening tank, the thickened sludge is inputted into a horizontal spiral centrifuge for dewatering, sewage and supernatant in the sludge thickening tank are jointly inputted into the adjusting tank, and efficient synchronous removal of COD ( chemical oxygen demand), ammonia nitrogen and micro-capsule algal toxin is realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for treating algae pulp press filtrate by using a downward flow aerated biological filter. Background technique [0002] With the development of my country's industry and agriculture, a large amount of nutrients, especially nitrogen and phosphorus, enter the water body through various channels, resulting in the proliferation of algae and other aquatic plants, the decline of dissolved oxygen in the water body, and the deterioration of water quality. At present, more than 66% of lakes and reservoirs in my country are at the level of eutrophication, of which heavy eutrophication and super eutrophication account for 22%. With the eutrophication of lakes and reservoirs, algae blooms will occur, especially under continuous high temperature conditions, cyanobacteria will accumulate and explode in a short period of time, forming severe cyanobacteria blooms. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34
Inventor 张文艺罗鑫刘明元李秋艳韩有法李定龙
Owner 溧阳常大技术转移中心有限公司