CN100595168C - High algae-laden water treatment technology - Google Patents

Abstract

The invention discloses an algae removing technique, in particular to a high algae-laden water treatment technique which can remove algal tox, including the following steps: high algae-laden water isfirstly led into a pond which keeps algae eating fishes; the outtaken water of the pond enters into an air bearing pond, and the solid substances are separated from the liquid through the returning dissolved air bearing technique; the outtaken water of the air bearing enters into a circular everglade which has two groups which are connected with each other, four channels are annularly and seriallyconnected, the water inlet is provided with a biological contact area which is provided with paddings, the surface of the paddings is agglutinated with a biological film, and the work is fulfilled according to the oxygen-poor-aerobic process. The invention has a plurality of steps coordinated with each other through the stopping of the pond, the filtering of the algae-eating fishes, partial returning dissolved air bearing, hydrolyzation, acidification, denitrification and organism oxidation and degradation of the circular everglade, so that the algae and the algal tox can be completely removed, thereby greatly reducing the toxicity of the algal tox in the water and achieving good social and economical benefit.

Description

A kind of high algae-laden water treatment technology

Technical field

The present invention relates to a kind of treatment process of algae-containing water, the treatment process of the high algae water of especially high algae toxin concentration.

Background technology

At present, many lake severe water pollution are arranged, and total nitrogen and total phosphorus concentration are higher, make algal bloom in the lake water, algae can discharge a kind of biotoxin-algae toxin, and Microcystin wherein (MCs) is the class fresh water cyanophycean toxin that present known toxicity is the strongest, acute hazard is maximum.The safety of these secondary metabolite serious harms mankind and other biological.Therefore to the processing of high algae water, the harm of algae toxin and the common concern that the improvement research work is subjected to domestic and international expert day by day.Often adopt barrier or filter to tackle method, air supporting method, mixed condensed gas flotation process, prechlorination (oxidation)-mixed condensed gas flotation process, coagulant sedimentation for high algae water treatment at present.Because the algae volume is little, the required aperture plate of interception method aperture is less, and head loss is bigger, and it is still very high to go out algae behind the net, and can't remove algae meta-bolites-algae toxin; Algae density is less, and the coagulating sedimentation requirement residence time is very long and clearance is low; The normal at present air supporting method (coagulation air-float, prechlorination air supporting) that adopts can be removed most of algae, but still not obvious to algae toxin removal effect.

Summary of the invention

The present invention provides a kind of algae-removing technology for the weak point that overcomes above-mentioned high algae-laden water treatment technology existence just, especially the high high algae-laden water treatment technology of algae content of toxins.

In order to solve the problems of the technologies described above, technology of the present invention comprises the following steps: that high algae water is introduced into the fish pond, has put food algae fish in the fish pond in a suitable place to breed; Enter air flotation pool from the water outlet in fish pond, and enter the circulation wetland behind flow through successively filter tank, the clean water basin; When the air flotation pool poor processing effect, water outlet enters the emergency processing pond, enters the air flotation pool clean water basin of flowing through once more, comes out to enter the circulation wetland by clean water basin again; The circulation wetland structure is two groups of parallel connections, and every group is the series connection of four channels annular, between channel, being provided with every training wall; At feed-water end biological zone of action is set, and at this district's installing filler, at filling surface apposition growth microbial film, according to the anoxic-aerobic process operation, biological zone of action filler has the perforation gas distribution pipe; Two channels are provided with pusher under water in the outside; And be provided with the air water back washing cleaning device at circulation wetland feed-water end; Fish pond of the present invention is connected in series for one or more, relies on the bottom opening water inlet between the placed in-line fish pond.In the fish pond, throw in food algae fish,, reduce the follow-up system load to reduce algae concentration in the water.The fish pond water outlet enters air flotation pool, adopts the partial reflux dissolved air flotation process, relies on microbubble, it is adhered on algae, suspended substance and the wadding grain, thereby mandatory come-ups such as realization wadding grain reaches the isolating purpose of solid, liquid; Suspended substance tiny in the water, algae are further removed in the air supporting water outlet through the filter tank, prevent follow-up wetland silting; The scum silica frost that air flotation pool produces enters slag bath, is transported to the landfill yard landfill after the pressure filter dehydration, and filtrate is returned the emergency processing pond, enters air flotation pool again.The water outlet clean water basin of flowing through in filter tank enter the circulation wetland, the circulation wetland is set to two groups of parallel connections, four canals annular polyphone, feed-water end is provided with biological zone of action, this district's installing filler, filling surface apposition growth microbial film, move according to anoxic-aerobic process, the acidication effect of anoxic part is decomposed into small molecules readily biodegradable material with the algae toxin of poisonous in the water and difficult degradation, and for denitrifying bacteria provides carbon source, finishes the denitrification denitrogenation effect under anaerobic environment; Aerobic part is finished the oxidative degradation of organic pollutant; The zone of action filler is divided into the perforation gas distribution pipe, viewing system dissolved oxygen situation start-stop aerating system; The outside two channels are reserved the water surface that opens wide, and add pusher under water, to guarantee the circulation oxidation effect; Circulation wetland feed-water end is established the air-water backwashing system, when turning to, wetland circulation carries out back flushing, the back flushing draining enters the biological zone of action of wetland front end with circulation, and suspended substance is removed through microbiological deterioration and flocculation sediment in the zone of action, and throw out regularly drains into slag bath.

The invention has the beneficial effects as follows, adopt algae-removing technology of the present invention, hold back and eat the filter food of algae fish, can reduce follow-up air flotation pool load by the fish pond; The partial reflux dissolved air flotation process relies on microbubble, and it is adhered on algae, suspended substance and the wadding grain, realizes mandatory come-ups such as wadding grain, reaches the isolating purpose of solid, liquid, reduces algae content once more; Circulation wetland feed-water end is provided with biological zone of action, this district's installing filler, filling surface apposition growth microbial film, move according to anoxic-aerobic process, the acidication effect of anoxic part is decomposed into small molecules readily biodegradable material with the algae toxin of poisonous in the water and difficult degradation, and provide carbon source for denitrifying bacteria, under anaerobic environment, finish the denitrification denitrogenation effect, aerobic part is finished the oxidative degradation of organic pollutant, this link water (flow) direction is adjustable, operation scheme is flexible, makes the algae toxin obtain removing more completely, greatly reduces the toxicity of algae toxin in the water.The a plurality of links of process using of the present invention cooperatively interact, and synergy has good social benefit and economic benefit.

Description of drawings

Fig. 1 is a process flow sheet of the present invention;

Fig. 2 is circulation wetland structure figure;

Fig. 3 is the A-A sectional view of Fig. 2.

Embodiment

The present invention is high, and algae water is introduced into fish pond 1, has put food algae fish in the fish pond in a suitable place to breed; Enter air flotation pool 2 from the water outlet in fish pond, and enter circulation wetland 6 behind the filter tank 3 of flowing through successively, clean water basin 4; During the air flotation pool poor processing effect, emergency processing pond 5 is returned in water outlet, enters air flotation pool 2 clean water basin 4 of flowing through once more, comes out to enter circulation wetland 6 by clean water basin again; Circulation wetland 6 structures are two groups of parallel connections, and each is the series connection of four channels 7 annular, between channel 7, being provided with every training wall 8; At feed-water end 9 biological zone of action 10 is set, and at this district's installing filler 11, at filling surface apposition growth microbial film 12, according to the anoxic-aerobic process operation, biological zone of action filler has perforation gas distribution pipe 13; Two channels are provided with pusher 14 under water in the outside; And be provided with air water back washing cleaning device 15 at circulation wetland feed-water end; Fish pond of the present invention is connected in series for one or more, relies on the bottom opening water inlet between the placed in-line fish pond.

It is specially:

Fish pond 1: divide three grades, in put silver carp, bighead in a suitable place to breed, breeding density is 46～50g/m ³The about 1678m of fish pond area ², all dark 2.0m of water, hydraulic detention time 23.8h.

2: two groups of parallel connections of air flotation pool, the about 46 * 2=92m of floor space ²Flocculation zone residence time 8min, disengaging zone residence time 20min, available depth 2.5m.

3: the two groups of parallel connections in filter tank, the about 30 * 2=60m of floor space ²

Clean water basin 4: residence time 40min, depth of water 1.1m, floor space 75m ²

Slag bath: the dark 3.3m in pond, the about 20m of area ²

Press filtration machine room: take up an area of about 16m ²

Emergency processing pond 5: all dark 3.0m of residence time 5h, water, take up an area of 58m ²

Comprehensively above-mentioned, except that the fish pond, comprise occupations of land such as road, pipeline, about 321m is always taken up an area of in pre-treatment ²

Air flotation pool air dissolving system: quantity of circulating water: about 19m ³/ h; Pump head: 45～50m; Air capacity: about 120L/min.

Circulation wetland 6: take up an area of about 3252m ², two groups of parallel connections, the about 490.6m of single group useful volume ³, hydraulic detention time 6.8h.Wetland channel 7 long 30m, width of the channel 5.0m, 4 canals annular polyphone, during 7 of channels are established every training wall 8.The all dark 0.7m of wetland design current velocity 0.12m/s, water.Feed-water end is established biological zone of action 10, and partition wall is established in the centre, and the zone of action hangs elastic solid filler 11, and at filling surface apposition growth microbial film 12, filler is divided into perforation gas distribution pipe 13, viewing system dissolved oxygen situation start-stop aerating system.For guaranteeing the circulation oxidation effect, the outside two channels are reserved the water surface that opens wide, and add pusher 14 under water.Circulation wetland feed-water end 9 is established air water back washing cleaning device 15, when turning to, wetland circulation carries out back flushing, the back flushing draining is removed through microbiological deterioration and flocculation sediment in the zone of action with the biological zone of action suspended substance that circulation enters the wetland front end, and throw out regularly drains into slag bath.

Claims (2)

1, a kind of high algae-laden water treatment technology is characterized in that, described technology comprises the following steps: that high algae water is introduced into fish pond (1), has put food algae fish in the fish pond in a suitable place to breed; Enter air flotation pool (2) from the water outlet in fish pond, and enter circulation wetland (6) behind the filter tank (3) of flowing through successively, clean water basin (4); During the air flotation pool poor processing effect, water outlet enters emergency processing pond (5), enters air flotation pool (2) clean water basin (4) of flowing through once more, and the clean water basin water outlet enters circulation wetland (6); Circulation wetland (6) structure is two groups of parallel connections, and every group is four channels (7) annular polyphone, between channel (7), being provided with every training wall (8); At feed-water end (9) biological zone of action (10) is set, and at this district's installing filler (11), at filling surface apposition growth microbial film (12), according to the anoxic-aerobic process operation, biological zone of action filler has perforation gas distribution pipe (13); Two channels are provided with pusher (14) under water in the outside; And be provided with air water back washing cleaning device (15) at circulation wetland feed-water end.

2, a kind of high algae-laden water treatment technology according to claim 1, it is characterized in that: the fish pond is to be connected in series more than one, rely on the bottom opening water inlet between the placed in-line fish pond, hold back and fish filter food removal part algae through the fish pond, water outlet is further handled through air flotation pool, filter tank, with most algae removals, the filter tank water outlet enters the circulation wetland after the clean water basin rectification, finishes the removal to the algae toxin in the circulation wetland.

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