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Method for regulating acidogenic effect of liquid state fermentation of sludge and removing nitrogen and phosphorus on line

A technology of nitrogen and phosphorus removal and liquid fermentation, applied in the field of organic solid waste recycling, can solve the problem of long overall cycle of sludge anaerobic fermentation and nitrogen and phosphorus removal, increase of subsequent treatment steps of fermentation broth, unfavorable process operation and management and other problems, to achieve the effect of simplifying the process flow, reducing the subsequent treatment process and improving the yield

Active Publication Date: 2017-09-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also some problems in this method: on the one hand, a large amount of ammonia nitrogen is produced due to the gradual consumption of protein substances during the fermentation process, and the concentration of ammonia nitrogen can reach more than 1000 mg / L. The efficiency of anaerobic fermentation is low; on the other hand, the nitrogen and phosphorus content of the fermentation liquid is high, far exceeding the discharge limit of the sewage plant, and it cannot be directly put into the sewage plant as a carbon source. The fermentation liquid often needs to be denitrified and dephosphorized. can be used as an external carbon source
However, due to the need for solid-liquid separation and chemical denitrification and phosphorus removal of the sludge after fermentation, the subsequent treatment steps of the fermentation broth are increased, which is not conducive to the operation and management of the entire process. operation, the total cycle of sludge anaerobic fermentation and nitrogen and phosphorus removal is relatively long, the efficiency is low, and the energy consumption is too large

Method used

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  • Method for regulating acidogenic effect of liquid state fermentation of sludge and removing nitrogen and phosphorus on line
  • Method for regulating acidogenic effect of liquid state fermentation of sludge and removing nitrogen and phosphorus on line
  • Method for regulating acidogenic effect of liquid state fermentation of sludge and removing nitrogen and phosphorus on line

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Effect test

Embodiment 1

[0030] (1) The first stage (UASB liquid fermentation without adding nitrogen and phosphorus removal device): Use deionized water to adjust the total solid concentration (TS) of the remaining sludge (Wuxi Shuofang Wastewater Treatment Plant, Jiangsu) to 75g / L, and use The pH of the NaOH solution was adjusted to 12, and after sealing, it was placed at 90-105°C and stirred slowly for 12 hours for pretreatment. Centrifuge the pretreated hydrolysate, and separate the liquid (organic load is 8kg COD / m 3 / d) Continuously pass into a 5L UASB reactor (the volume of the inoculated seed mud is 20%) for fermentation. During the fermentation, the temperature in the reactor is controlled at 35±2℃ and the pH is controlled at 9-10. The yield of ammonia nitrogen, total phosphorus and TVFA are as follows: figure 2 , 3 Shown in the first stage. During steady operation, the concentrations of ammonia nitrogen and total phosphorus were 991.60±3.23 mg / L and 532.16±1.59 mg / L, respectively, and the yi...

Embodiment 2

[0033] UASB liquid fermentation with nitrogen and phosphorus removal equipment:

[0034] Adjust the total solid concentration (TS) of the remaining sludge (Wuxi Shuofang Wastewater Treatment Plant, Jiangsu) to 75g / L with deionized water, and adjust its pH to 12 with NaOH solution, and then place it under 95℃ and slowly stir for 12h after sealing. Pretreatment. Centrifuge the pretreated hydrolysate, and separate the liquid (organic load is 8kg COD / m 3 / d) Continuously pass into a 5L UASB reactor (the volume of the inoculated seed mud is 20%) for fermentation. During the fermentation, the temperature in the reactor is controlled at 35±2°C, and the pH is controlled at 9-10. Among them, the fermentation broth of UASB enters the nitrogen and phosphorus removal device with a reflux ratio of 0.8 and HRT of 2.0h, and Mg is kept in the nitrogen and phosphorus removal device. 2+ Dosing concentration is 1000±5.0mg / L, temperature and pH are the same as UASB. During steady operation, the am...

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Abstract

The invention discloses a method for regulating the acidogenic effect of liquid state fermentation of sludge and removing nitrogen and phosphorus on line, which belongs to the field of turning organic solid wastes into sources. The method couples and synchronizes a denitrifying and dephosphorizing device and an upflow anaerobic sludge fluidized bed (UASB) to achieve the objective of removing nitrogen and phosphorus and increasing the yield of volatile fatty acid (VFA). The denitrifying and dephosphorizing device, which is of an upflow type, receives fermented liquid coming from the UASB after the liquid state fermentation of sludge, dissolved magnesium salt is added according to a produced struvite proportion, the denitrified and dephosphorized liquid flows back into the UASB, and produced struvite precipitate is removed from the bottom of a reactor. Compared with ammonia nitrogen and total phosphorus in the fermented liquid of a UASB not synchronized with a denitrifying and dephosphorizing device, ammonia nitrogen and total phosphorus in the fermented liquid of the method disclosed by the invention are respectively decreased by 78.09 plus or minus 0.30 percent and 94.61 plus or minus 0.51 percent, and meanwhile, 1.52 plus or minus 0.04g of struvite / g of PO4<3-> is recovered. Moreover, the proportions of acetic acid and propionic acid are increased to 66.76 plus or minus 0.23 percent and 16.54 plus or minus 0.17 percent, and the directional acidogenesis of acetic acid and propionic acid is enhanced.

Description

Technical field [0001] The invention relates to a method for regulating the acid production effect of sludge liquid fermentation and online denitrification and phosphorus removal, and belongs to the field of organic solid waste recycling. Background technique [0002] The anaerobic fermentation of urban surplus sludge to produce volatile fatty acids (VFAs) as a way of resource utilization of sludge has attracted increasing attention in wastewater treatment plants. Sludge liquid fermentation is an efficient method for acid production, which has the advantages of high fermentation intensity, high VFAs output and low operating energy consumption. However, this method also has some problems: On the one hand, protein substances are gradually consumed during the fermentation process to produce a large amount of ammonia nitrogen, the concentration of ammonia nitrogen can reach more than 1000 mg / L, and the conversion of ammonia nitrogen into free ammonia continuously accumulates and seve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01B25/45C02F101/10C02F101/16
CPCC01B25/451C02F1/5236C02F3/2846C02F2101/105C02F2101/16
Inventor 刘和李祎飞马惠君刘宏波符波
Owner JIANGNAN UNIV
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