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Method and device for denitrification and dephosphorization of sewage

A technology for denitrification and phosphorus removal and sewage, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Low recovery rate and other problems, to achieve the effect of stable sewage treatment quality, long service life, convenient and simple material acquisition

Inactive Publication Date: 2016-08-24
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The present invention solves the problem of limited sludge treatment capacity per unit area, high energy consumption and low nitrogen and phosphorus removal rate caused by adjusting and optimizing the alternation of anaerobic, anoxic and aerobic states in the existing nitrogen and phosphorus removal process. Due to the low recovery rate of nitrogen and phosphorus, high operation and maintenance costs, and secondary pollution caused by struvite denitrification and phosphorus removal process, a sewage denitrification and phosphorus removal method and its device are provided, and the COD removal rate reaches more than 97%. Ammonia nitrogen (NH 3 -N) 99% removal, phosphorus (P) 98% removal, fully meet the sludge reduction requirements, and can realize efficient recovery of nitrogen and phosphorus resources and energy storage and reuse

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  • Method and device for denitrification and dephosphorization of sewage

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Embodiment 1

[0035] Such as figure 1 As shown, a sewage denitrification and phosphorus removal device is mainly composed of a water inlet tank 1, anaerobic membrane bioreactor 2, adsorption tank 10 and gas separation membrane device 11 connected in sequence, and the adsorption tank 10 and gas separation membrane device 11 The inlet end is connected, and the outlet end of the gas separation membrane device 11 is connected to the ammonia nitrogen absorption pool 13 and the water outlet 12 respectively.

[0036]The present invention adopts an anaerobic membrane bioreactor treatment system, which includes a water inlet pool 1, an anaerobic membrane bioreactor 2, a gas collection device 4, a membrane surface scouring device 19, and a vacuum diaphragm pump 14. A mechanical agitator is provided in the water inlet pool 1, and the water inlet pool 1 and the anaerobic membrane bioreactor 2 are connected by short pipes. A gas collection device 4 is arranged above the anaerobic membrane bioreactor 2,...

Embodiment 2

[0044] The method for denitrification and dephosphorization of sewage of the present invention comprises the following steps:

[0045] Step 1. Anaerobic hydrolysis: the sewage entering the anaerobic membrane bioreactor 2 from the inlet pool 1 undergoes anaerobic hydrolysis fermentation reaction in the anaerobic membrane bioreactor 2, and this reaction degrades a large amount of COD in the sewage, while the sewage in the sewage The organic nitrogen and organic phosphorus in the anaerobic membrane bioreactor 2 are converted into ammonia nitrogen and phosphate, and flow out of the anaerobic membrane bioreactor 2 with water under the action of the first suction pump 15 .

[0046] Step 2. Phosphorus removal and recovery by adsorption: the sewage that enters the first adsorption pool 5 from the anaerobic membrane bioreactor 2 undergoes a phosphorus adsorption process in the first adsorption pool 5, and the adsorbed sewage is acted on by the second suction pump 16 Enter the phosphoru...

Embodiment 3

[0050] In a simulation test of wastewater from a poultry breeding factory in Lishui District, Nanjing, the invention was used to treat poultry breeding wastewater.

[0051] The influent COD concentration of the anaerobic membrane bioreactor is 3548mg / L, the total nitrogen (TN) concentration is 522mg / L, and the ammonia nitrogen (NH 3 -N) concentration is 510mg / L, total phosphorus (TP) concentration is 25mg / L, and the inlet water temperature is 16-20°C.

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Abstract

The invention discloses a sewage nitrogen and phosphorus removal method and device. The device comprises a water inlet tank (1), an anaerobic membrane bioreactor (2), an adsorption tank, a gas separation membrane device (11) and an ammonia nitrogen absorption tank (13) which are connected in sequence, wherein sewage enters the anaerobic membrane bioreactor (2) from the water inlet tank (1) for anaerobic hydration; a vacuum membrane pump (14) and a membrane surface washing device (19) conduct membrane surface washing on the anaerobic membrane bioreactor (2); the sewage after hydration enters the adsorption tank for adsorption phosphorus removal; the sewage after adsorption phosphorus removal and alkalinity medical liquid react; the sewage is separated into purified water and ammonia gas after the sewage enters the gas separation membrane device (11); the ammonia gas enters the ammonia nitrogen absorption cell (13) after the ammonia gas reacts with acidity medical liquid; purified water flows out from a water outlet. According to the invention, 99% of ammonia nitrogen (NH3-N) is removed and recovered; 98% of phosphorus (P) is removed and recovered; water outlet effect is good; new energy is provided; energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a sewage denitrification and dephosphorization method and a device thereof. Background technique [0002] The currently widely used denitrification and phosphorus removal processes all include the alternation of anaerobic, anoxic and aerobic states in space or time. These processes often achieve efficient nitrogen and phosphorus removal by adjusting and optimizing the combination of the three states the goal of. [0003] A 2 / O is currently a relatively mature process for denitrification and phosphorus removal of sewage. The treatment efficiency of this process can reach more than 70% of TN and about 90% of TP. It has the characteristics of simple system, short hydraulic retention time, less sludge bulking, and low operating cost . However, if the denitrification and phosphorus removal processes are completed in one system at the same time, there will inevitably b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 陈琳靳斌斌朱亮王俊夏新邱云鹏
Owner HOHAI UNIV
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