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Method for reinforcing anaerobic biological phosphorus removal of wastewater through biological carbon coupling micro-current

An anaerobic biological and biochar technology, applied in chemical instruments and methods, biological water/sewage treatment, electrochemical biological combined treatment, etc., can solve the problems of complex process, difficult adjustment of system parameters, etc. , Reduce the consumption of carbon source, the effect of moderate proportion

Active Publication Date: 2018-08-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing patent application CN 104828939 A discloses "a method for multi-stage phosphorus removal and production of phosphine from phosphorus-containing organic wastewater". Through the two reaction units of anaerobic fermentation and microbial electrolysis cell, multi-stage phosphorus removal and production of phosphine are realized. While improving the efficiency of phosphorus removal, the purity of phosphine produced is relatively high, but the process is quite complicated, and the regulation of system parameters also more difficult
The existing patent application CN 106365309 A discloses "a method for anaerobic biological phosphorus removal and phosphorus recovery of phosphorus-containing sewage". By controlling the organic load and phosphorus load of the sewage system to enrich phosphate-reducing bacteria, the phosphate-reducing bacteria will Phosphate in wastewater is transformed into phosphine to achieve the purpose of phosphorus removal; phosphine is a gaseous form of phosphorus cycle, and phosphorus removal in wastewater is achieved through the release of gaseous phosphine. This type of research has been paid more and more attention; See the disclosure of phosphorus removal methods related to this application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The anaerobic pool sludge from the urban sewage treatment plant was inoculated into phosphorus-containing wastewater, and the concentration of the mixed liquid sludge in the anaerobic reactor was 5060 mg / L; after the mixture was ultrasonically crushed, the total phosphorus concentration was determined to be 520 mg / L; Coconut shell was used as raw material, and under the condition of nitrogen as protective gas, the temperature was raised to 700°C in a muffle furnace at 15°C / min, and after carbonization for 2h, it was cooled to near room temperature. The obtained carbon-based material was soaked in 0.3mol / L HCl for 2h, and then used Wash with ionic water until the lotion is neutral, dry at 80°C to constant weight to obtain coconut shell biochar, and the dosage of biochar is 1.5kg / m 3 Phosphorus-containing wastewater to be treated;

[0020] Take coconut shell biochar and add it to the above-mentioned wastewater after inoculation, adjust the pH to 7.0 after stirring and mix...

Embodiment 2

[0023] Inoculate the sludge from the anaerobic tank of the urban sewage treatment plant into phosphorus-containing wastewater. The concentration of the mixed liquid sludge in the anaerobic reactor is 6960mg / L, and the concentration of total phosphorus is 670mg / L; bamboo chips are used as raw materials, and nitrogen is used as protection. Under gas conditions, the temperature was raised to 600°C at 20°C / min in a muffle furnace, carbonized for 2.5 hours, and then cooled to near room temperature. The obtained carbon-based material was soaked in 0.2mol / L HCl for 2 hours, and then washed with deionized water until the washing liquid was medium. Bamboo biochar is obtained by drying at 80°C to constant weight, and the dosage of biochar is 1.0kg / m 3 Phosphorus-containing wastewater to be treated;

[0024] Take bamboo chips biochar and add it to the wastewater after inoculation, adjust the pH to 7.5 after stirring and mixing, and maintain the current intensity in the reactor at 50mA; p...

Embodiment 3

[0027] The anaerobic tank sludge from the urban sewage treatment plant was inoculated into phosphorus-containing wastewater. The concentration of the mixed liquid sludge in the anaerobic reactor was 3120 mg / L, and the total phosphorus concentration was 426 mg / L; :1) The mixture is used as the raw material. Under the condition of nitrogen as the protective gas, the temperature is raised to 500°C in the muffle furnace at 25°C / min, carbonized for 3h, and then cooled to near room temperature. The obtained carbon-based material is soaked in 0.1mol / L HCl for 2h, and then Wash with deionized water until the washing liquid is neutral, and dry at 80°C to constant weight to obtain biochar. The dosage of biochar is 0.5kg / m 3 Phosphorus-containing wastewater to be treated;

[0028] Take biochar and add it to the above-mentioned inoculated wastewater, stir and adjust the pH to 6.5 after mixing, and maintain the current intensity in the reactor at 30mA; place the reactor in a constant tempe...

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Abstract

The invention discloses a method for reinforcing anaerobic biological phosphorus removal of wastewater through biological carbon coupling micro-current, and belongs to the technical field of wastewater treatment. According to the method, anaerobic sludge of a municipal sewage treatment plant is inoculated into phosphorus-containing wastewater to be treated, then biological carbon is added, stirring is carried out for uniform mixing, the pH value of the wastewater is adjusted, the current intensity of the reaction system is controlled through an external voltage-stabilized constant-current power supply, and the anaerobic digestion is carried out at the temperature of 15-35 DEG C. Under the action of biological carbon coupling micro-current to the phosphorus-containing wastewater, anaerobicmicroorganisms convert phosphate into a gaseous phosphine, and the gaseous phosphine escapes from the water body, so that the total content of phosphorus entering a subsequent biochemical unit is reduced, and the biological phosphorus removing effect of the anaerobic-anoxic-aerobic biochemical treatment system is obviously improved. The technological process is simple, the period is short, and thephosphorus removal effect is obvious.

Description

technical field [0001] The invention relates to a method for enhancing anaerobic biological phosphorus removal of wastewater by coupling microcurrent with biochar, and belongs to the technical field of wastewater treatment. Background technique [0002] In recent years, the production and consumption of chemical fertilizers, pesticides, and phosphorus-containing detergents in my country have increased rapidly, and the eutrophication of water bodies caused by phosphorus pollution has become increasingly serious. Lake "blooms" and offshore "red tides" have occurred and intensified. Eutrophication of water bodies has endangered agriculture and fishery, and also poses a huge threat to drinking water sanitation and food safety. The control of phosphorus pollution mainly adopts chemical and biological methods. The chemical phosphorus removal method requires the addition of chemical agents, which will generate a large amount of chemical sludge, and the treatment cost is quite expe...

Claims

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Application Information

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IPC IPC(8): C02F3/28
CPCC02F3/005C02F3/2813
Inventor 刘树根李婷刘煜牛晓君宁平
Owner KUNMING UNIV OF SCI & TECH
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