CN203639266U

CN203639266U - Struvite crystallizing reaction device for collecting nitrogen and phosphorus in biogas slurry

Info

Publication number: CN203639266U
Application number: CN201320664304.9U
Authority: CN
Inventors: 杨志敏; 陈玉成; 雷蕾; 王莹
Original assignee: Southwest University
Current assignee: Southwest University
Priority date: 2013-10-25
Filing date: 2013-10-25
Publication date: 2014-06-11
Anticipated expiration: 2023-10-25

Abstract

The utility model provides a struvite crystallizing reaction device for collecting nitrogen and phosphorus in biogas slurry. The struvite crystallizing reaction device comprises a mixed reaction area, a crystallizing and precipitating area, a buffering area, a struvite sludge area, a precipitating and separating area, and an overflow water collecting area, wherein the mixed reaction area is provided with a water inlet, a NaOH solution feeding port, a MgCl2 solution feeding port, and a stirrer, a struvite crystal trapping net is distributed in the crystallizing and precipitating area and is fixed between the bottom end of an inner cylinder and an outer cylinder, so as to prevent the struvite sludge from entering a separating area along with water flow, the struvite sludge area is cone, is arranged at the bottom of the device, and is provided with a mud valve capable of recycling high concentration struvite sludge and an external receiving port for struvite sludge dialysate, the precipitating and separating area is arranged between the inner cylinder and the outer cylinder, which are fixed by a fixed mount, and a drain pipe is arranged at the lower end of a water collecting tank in the overflow water collecting area. The struvite crystallizing reaction device effectively solves the problem that in the prior art, the removal rate of phosphorus and ammonia nitrogen in centralized biogas slurry is low, and the nitrogen and phosphorus elements are inconvenient to recycle.

Description

A kind of struvite crystallization reaction device of collecting nitrogen, phosphorus in the liquid of natural pond

Technical field

The utility model relates to concentrated natural pond liquid and administers technical field, relates in particular to a kind of struvite crystallization reaction device of collecting nitrogen, phosphorus in the liquid of natural pond

Background technology

Concentrated natural pond liquid quantity discharged is large, complicated component, pollution load are large, wherein phosphorus is up to 100～200mg/L, ammonia nitrogen is up to 1000～5000mg/L, and according to People's Republic of China's livestock and poultry breeding industry pollutant emission standard, it is 80mg/L that ammonia nitrogen concentration is daily discharged in the highest permission of intensive livestock and poultry breeding industry water pollutant, total phosphorus is 8.0mg/L, and this is a huge challenge beyond doubt for biogas engineering.Struvite crystalline deposit method, as a kind of more novel method, obtains more and more investigators' favor in high ammonia nitrogen, phosphorus field of waste water treatment.Struvite molecular formula is MgNH ₄pO ₄6H ₂o, is a kind of white crystal that is insoluble in water, by adding the pH value of magnesium salts and raising waste water, makes the NH of free state in waste water ₄ ⁺and PO ₄ ^3-with Mg ²⁺form struvite crystalline deposit, when realizing nitrogen and phosphorus pollution thing, remove, and struvite itself contains two kinds of nutritive elements of nitrogen phosphorus, is a kind of well slow-release fertilizer.The struvite precipitator method are applied in the processing of concentrated natural pond liquid, not only can efficiently remove nitrogen, the phosphorus in the liquid of natural pond, can realize again the efficient recovery to compound fertilizer, be conducive to the Sustainable development of biogas industry and nitrogen, phosphor resource simultaneously.

Utility model content

Technical problem to be solved in the utility model is: a kind of struvite crystallization reaction device of collecting nitrogen, phosphorus in the liquid of natural pond is provided.

The utility model solves the technical scheme that its technical problem adopts: a kind of struvite crystallization reaction device of collecting nitrogen, phosphorus in the liquid of natural pond; It is characterized in that: comprise hybrid reaction district (I), crystalline deposit district (II), buffer zone (III), struvite mud district (IV); Depositing separation area (V), overflow catchment area (VI); Hybrid reaction district (I) is provided with water-in, NaOH solution adds mouth, MgCl ₂liquid adds mouth and agitator, (II) is furnished with struvite crystals collecter ring in crystalline deposit district, struvite crystals collecter ring is fixed between inner core bottom and urceolus, to prevent that struvite mud from entering disengaging zone (V) with current, struvite mud district (IV) is conical, be positioned at the bottom of device, and be provided with mud valve and the struvite mud penetrating fluid external tapping of recyclable high density struvite mud; Depositing separation area (V) is between inner core and urceolus, and wherein inner core and urceolus fix by anchor; There is water shoot the water leg lower end of overflow catchment area (VI).

The beneficial effects of the utility model are: the struvite precipitator method are applied to the industrial treatment of concentrated natural pond liquid, a kind of simple to operate, continuous reaction apparatus that treatment effect is stable is provided, improved the treatment capacity to natural pond liquid in the unit time, realize

The object of efficient processing; Reaction unit energy consumption is low, operation and maintenance cost is low, it is little to take up an area, easy handling; In struvite crystallization apparatus, be provided with crystal trapping net, in reducing water outlet turbulence level, can realize the trapping to tiny struvite crystallization; The ideal treatment effect of the utility model to concentrated natural pond liquid, to the clearance of concentrated natural pond liquid phosphorus, ammonia nitrogen more than 68.24% and 45.82%; The utility model is the synchronous nitrogen phosphoric that reclaims in the process realizing at denitrogenation dephosphorizing, realizes the high-value-use of concentrated natural pond liquid, is a kind of water treatment novel process less, that effectively remove and reclaim nitrogen, phosphorus in the liquid of concentrated natural pond of investing.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the utility model struvite crystallization reaction apparatus structure block diagram;

Fig. 2 is the floor map of the utility model struvite crystallization reaction device;

Embodiment

Below in conjunction with accompanying drawing, the utility model is further described, but protection domain of the present utility model is not limited to the following stated.

The utility model object is to provide a kind of struvite crystallization reaction device of collecting nitrogen, phosphorus in the liquid of natural pond, and this device is the synchronous nitrogen phosphoric that reclaims in the process of natural pond liquid denitrogenation dephosphorizing, realizes the high-value-use of concentrated natural pond liquid.

In the liquid of collection of the present utility model natural pond, the struvite crystallization reaction device of nitrogen, phosphorus comprises hybrid reaction district (I), crystalline deposit district (II), buffer zone (III), struvite mud district (IV); Depositing separation area (V), overflow catchment area (VI); Hybrid reaction district (I) is provided with water-in 4, NaOH solution adds mouth 2, MgCl ₂liquid adds mouth 3 and agitator 1, (II) is furnished with struvite crystals collecter ring 10 in crystalline deposit district, struvite crystals collecter ring 10 is fixed between inner core 5 bottoms and urceolus 6, to prevent that struvite mud from entering disengaging zone (V) with current, struvite mud district (IV) is conical, be positioned at the bottom of device, and be provided with mud valve 11 and the struvite mud penetrating fluid external tapping 12 of recyclable high density struvite mud; Depositing separation area (V) is between inner core 5 and urceolus 6, and wherein inner core 5 and urceolus 6 fix by anchor 9; There is water shoot 8 water leg 7 lower ends of overflow catchment area (VI).

The utility model is realized by following process steps successively:

(1); Concentrated natural pond liquid enters struvite crystalline deposit device via water-in, and flooding velocity is 2～4L/h;

(2); In the process of water inlet, drip NaOH solution, maintain pH value between 8.5～9.5, and drip in right amount MgCl ₂solution, makes Mg ²⁺: PO ₄ ^3-be 1: 1～1.2: 1, turn on agitator, rotating speed is 150～200r/min;

(3); NH in the liquid of concentrated natural pond ₄ ⁺, PO ₄ ^3-with Mg ²⁺after stirring, fully mix, under alkaline environment, form struvite crystallization, and precipitate by the mode of gravitational settling;

(4); Water outlet after treatment is through buffer zone to overflow to depositing separation area, and the enrichment on the net when by crystal trapping net of part struvite fine crystals, more can effectively reduce the content of phosphorus in water outlet;

(5); Water outlet enters water leg through overflow catchment area, and discharges by water shoot;

(6); The mud in struvite mud district is pushed and is formed high concentration sludge by gravity, can be removed by mud valve.

With the utility model method place concentrated natural pond liquid, to the phosphoric clearance in the liquid of natural pond more than 68.24%, can be up to 45.82% to the clearance of ammonia nitrogen.

Finally it should be noted that: above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: the technical scheme that its in specification sheets still can be recorded aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement, does not make the essence of appropriate technical solution depart from the spirit and scope of the each embodiment technical scheme of the utility model.

Claims

1. collect the struvite crystallization reaction device of nitrogen, phosphorus in the liquid of natural pond for one kind; It is characterized in that: comprise hybrid reaction district (I), crystalline deposit district (II), buffer zone (III), struvite mud district (IV); Depositing separation area (V), overflow catchment area (VI); Hybrid reaction district (I) is provided with water-in (4), NaOH solution adds mouthful (2), a MgCl ₂liquid adds mouthful (3) and an agitator (1), crystalline deposit district (II) is furnished with struvite crystals collecter ring (10), struvite crystals collecter ring (10) is fixed between inner core (5) bottom and urceolus (6), to prevent that struvite mud from entering disengaging zone (V) with current, struvite mud district (IV) is conical, be positioned at the bottom of device, and be provided with mud valve (11) and the struvite mud penetrating fluid external tapping (12) of recyclable high density struvite mud; Depositing separation area (V) is positioned between inner core (5) and urceolus (6), and wherein inner core (5) and urceolus (6) fix by anchor (9); There is water shoot (8) water leg (7) lower end of overflow catchment area (VI).