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A kind of siderite/sulfur biofilter and its method for simultaneously removing nitrogen and phosphorus in water

A biofilter, siderite technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sewage treatment, etc., can solve the problems of slow reaction speed, high calcium ion in effluent, high hardness of effluent, etc., to achieve the method Simple and practical, high processing power, widely distributed effects

Active Publication Date: 2020-03-24
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When the traditional biological water treatment process treats sewage with low carbon-to-nitrogen ratio, the denitrification and phosphorus removal effect is not good and the cost is high; the sulfur / limestone system has a good denitrification effect, but cannot effectively remove phosphorus, and the effluent hardness is too high; pyrite The system can effectively remove nitrogen and phosphorus, but the reaction speed is slow, and there is also the problem of excessive calcium ions in the effluent

Method used

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  • A kind of siderite/sulfur biofilter and its method for simultaneously removing nitrogen and phosphorus in water
  • A kind of siderite/sulfur biofilter and its method for simultaneously removing nitrogen and phosphorus in water
  • A kind of siderite/sulfur biofilter and its method for simultaneously removing nitrogen and phosphorus in water

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Embodiment 1

[0034] A method of synchronously removing nitrate nitrogen and phosphorus in water by using siderite / sulfur biofilter in this embodiment, the treatment object is the artificial water distribution composed of tap water, potassium dihydrogen phosphate, ammonium chloride and potassium nitrate, wherein NO 3 - -N28mg / L, PO 4 3 -P3.1mg / L, NH 4 + -N2mg / L, water temperature 20°C, other treatment steps are:

[0035] (1) Filling preparation and construction of biofilter: siderite and sulfur are prepared into granular materials with a particle size of 2 mm respectively, and the siderite and sulfur particles are washed with clean water before filling, and the pH value of the rinsed water reaches 7-8. Can. Mix siderite and sulfur particles uniformly at a volume ratio of 3:1 and fill the reactor. The reactor is an upflow reactor with water inflow from the bottom and water outflow from the top, and the best shape is cylindrical. Among them, the volume ratio of siderite and sulfur has a...

Embodiment 2

[0040] A method of synchronously removing nitrate nitrogen and phosphorus in water using a siderite / sulfur biofilter in this embodiment is basically the same as in embodiment 1, except that siderite and sulfur are prepared separately in step 1 of this embodiment Granular material with a particle size of 0.5 mm and cleaned, and then the siderite and sulfur are uniformly mixed in a volume ratio of 2:1 to fill the reactor; in step 2, the enriched bacteria solution is mixed with the culture medium, and the inoculum size is 7 %, after 3 days of static culture, new medium is pumped again until the reactor film is mature; in step 3, the waste water to be treated is pumped into the reactor, the hydraulic retention time is 48 hours, and it runs for one month, sampling once a day to complete the sewage Synchronous removal of nitrate nitrogen and phosphorus in the water, the effluent discharges up to the standard, the results are as follows figure 2 As shown, the concentration of nitrat...

Embodiment 3

[0042] A method of synchronously removing nitrate nitrogen and phosphorus in water by using a siderite / sulfur biofilter in this embodiment is basically the same as in Embodiment 2, except that the influent in this embodiment comes from a certain sewage treatment plant in Changzhou Level 2 effluent and influent comprehensive indicators are as follows: COD68mg / L, PO 4 3- -P0.35mg / L, NO 3 - -N8.498mg / L, NH 4 - -N0.326mg / L, SO 4 2- -S324.857mg / L. The present embodiment runs for 10 days, takes a sample every two days, and the sampling result is as follows: image 3 As shown, the nitrate nitrogen in the final effluent was lower than the detection limit, the nitrate nitrogen removal rate was 100%, the phosphate in the effluent gradually decreased, and the phosphate removal capacity gradually recovered.

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Abstract

The invention discloses a siderite / sulfur biofilter tank and a method for simultaneous removal of nitrate nitrogen and phosphorus in water by using the same, and belongs to the field of sewage deep treatment. The method comprises the following steps: (1) preparation and construction of a biofilter tank packing; (2) startup of the biofilter tank; and (3) operation of the biofilter tank. In the method, sulfur autotrophic denitrifying bacteria take sulfur as electron donors, nitrate in water is reduced into nitrogen gas, and nitrate nitrogen in the water is removed; siderite provides an inorganic carbon source for supporting performing of autotrophic denitrifying reaction and simultaneously releases iron ions for chemical removal of phosphorus, so that the simultaneous denitrification and phosphorus removal of the filter tank is realized. The biofilter tank has the advantages of simple structure, convenient start-up, stable operation, high efficiency of denitrification and phosphorus removal, and is suitable for deep treatment of sewage.

Description

technical field [0001] The invention belongs to the field of advanced sewage treatment, and specifically relates to a siderite / sulfur biological filter and a method for synchronously removing nitrate nitrogen and phosphorus in water by using it. Background technique [0002] In the traditional water treatment biological denitrification process, microorganisms convert ammonia nitrogen into nitrate nitrogen under aerobic conditions, and heterotrophic denitrifying bacteria gradually convert nitrate nitrogen into nitrogen gas under anoxic conditions with organic carbon sources as electron donors. Traditional biological phosphorus removal is accomplished by using microorganisms such as phosphorus accumulating bacteria to absorb phosphorus under aerobic conditions and release phosphorus under anoxic conditions. Both processes require organic carbon sources. A2 / O and other processes formed by combining biological nitrogen removal and biological phosphorus removal in series can achi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F101/10C02F101/16
CPCC02F1/281C02F3/2826C02F2101/105C02F2101/16
Inventor 李睿华李甫昌张永威王卫葛志斌李爱民
Owner NANJING UNIV
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