CN201722256U - Sewage treating pond - Google Patents

Abstract

The utility model discloses a sewage treatment pool, which comprises an anaerobic area, anoxic area, an aerobic area and a water outlet area, an aeration system is arranged at the bottom of the pool corresponding to the aerobic area, and the aerobic area is filled with light suspension Filling, a first barrier structure is set between the anaerobic zone and the anoxic zone, and the bottom of the first barrier structure is provided with a first water hole for inputting sewage from the anaerobic zone to the anoxic zone; the anoxic zone and the aerobic zone A second blocking structure is provided between the zones, and a second water hole is provided at the lower part of the second blocking structure, and intercepting screens are arranged at intervals on the second blocking structure, and the second water holes are distributed between the intercepting screens, An agitator to prevent sludge from settling is arranged on the blocking screen; an interval screen is arranged between the aerobic area and the water outlet area. The utility model scientifically and rationally improves the sewage treatment pool, fills a certain amount of fillers, and continuously treats the sewage in a cycle, so that the sewage treatment pool can work continuously, improves the denitrification rate, and reduces the cost of sewage treatment.

Description

a sewage treatment pool

technical field

The utility model relates to the technical field of organic sewage treatment, in particular to a sewage treatment pool for treating residential sewage and industrial waste water.

Background technique

The SBR method is the abbreviation of the sequencing batch activated sludge method. Its process has many advantages such as simple structure, compact layout, less land occupation, stable treatment effect and flexible operation. In recent years, the SBR method has been greatly developed, but its pool capacity utilization rate is low, the equipment idle time is long, and it is difficult to work continuously. The average value of the removal of ammonia nitrogen from the sewage treated by the traditional or classic SBR method is only 30%. At the same time, due to the small volume of the SBR tank, the residence time of the sewage is short and the aeration time is short, resulting in COD, NH ₃ -N, and BOD ₅ cannot be stably up to the standard discharge, and the existing traditional or classic SBR process often does not require biological denitrification, and the effluent quality is difficult to meet the first-level discharge standard. This shows that the prior art needs further improvement and development.

Utility model content

The utility model provides a sewage treatment pool to solve the above-mentioned defects in the prior art, and scientifically and rationally improves the sewage treatment pool in the prior art to improve its denitrification performance and reduce its idle rate.

In order to solve the above-mentioned technical problems, the utility model scheme includes:

A sewage treatment pond, which includes an anaerobic zone, anoxic zone, an aerobic zone, and an outlet zone, wherein an aeration system is provided at the bottom of the tank corresponding to the aerobic zone, and the aerobic zone is filled with light suspended fillers, and the anaerobic zone A first barrier structure is set between the oxygen zone and the anoxic zone, and the bottom of the first barrier structure is provided with a first water hole for inputting sewage from the anaerobic zone to the anoxic zone; between the anoxic zone and the aerobic zone A second barrier structure is provided, and the second barrier structure is provided with a second water hole at the bottom, and intercepting screens are arranged at intervals on the second barrier structure, and the second water holes are distributed between the intercepting screens, and the intercepting screens An agitator is provided to prevent sludge from settling; an interval screen is provided between the aerobic zone and the water outlet zone.

The above-mentioned sewage treatment tank, wherein, the above-mentioned second barrier structure is a barrier plate or a barrier wall, and the intercepting screens are arranged on the second barrier structure at intervals, and each intercepting screen is vertical from the upper edge of the barrier plate or the barrier wall. Extend straight to the lower edge; the second water hole is arranged at the lower part of the barrier plate or the barrier wall between the interception screens.

Said sewage treatment tank, wherein, the above-mentioned interval screen extends to both sides to the side wall of the pool, extends upward to the upper edge of the pool, and extends downward to the bottom of the pool.

Said sewage treatment tank, wherein, a mud discharger is provided in the water outlet area, and a mixed liquid return pump for returning the effluent to the anoxic area is provided at the end of the water outlet area.

Said sewage treatment tank, wherein at least one flow pusher is arranged in the water outlet area, and at least one flow pusher is respectively arranged at both ends of the anoxic area close to the side wall of the pool.

Said sewage treatment pool, wherein, the cross section of said sewage treatment pool is circular.

Said sewage treatment tank, wherein, said spacer screens are provided with fillers capable of nitrifying and retaining nitrifying bacteria.

The sewage treatment pool treats sewage at a low water level, and continuously pours sewage into the pool from a high water level, so that the sewage treatment forms a continuous process and improves the efficiency of sewage treatment.

The utility model provides a sewage treatment pool, the sewage treatment pool is designed as a circular cross-section, the overall shape is close to a cylindrical pool, and the pool is divided into anaerobic area, anoxic area, aerobic area and water outlet area. The aerobic area is filled with sewage treatment filler, the bottom of the aerobic area is equipped with an aeration system, and the anoxic area is equipped with agitators to prevent sludge from settling. The sewage treatment tank can continuously treat sewage, which improves the efficiency of sewage treatment and reduces its idle time. The aerobic area is filled with biological fillers that can retain nitrifying bacteria with a long generation time, which improves the efficiency of denitrification. The sewage treated by the utility model reaches the first-class discharge standard, and the denitrification rate can reach more than 90%.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of a pond side wall cut off in the sewage treatment pond in the utility model;

Fig. 2 is the top view structure schematic diagram of the sewage treatment tank in the utility model;

Fig. 3 is a schematic diagram of the longitudinal section structure of the sewage treatment tank in the utility model.

Detailed ways

The utility model provides a sewage treatment pool. In order to make the purpose, technical solution and advantages of the utility model clearer and clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

The utility model provides a sewage treatment pool, which divides the sewage treatment pool into anaerobic area, anoxic area, aerobic area and water outlet area, wherein the anoxic area is equipped with agitator, and the aerobic area is filled with sewage treatment fillers. When the pool is settling and decanting, water can still flow continuously, which improves the efficiency of sewage treatment, and the sewage passes through various areas continuously, so that the organic matter in the sewage can fully contact with the filler, and the efficiency of denitrification is improved. As shown in Figure 1, the sewage treatment tank includes anaerobic zone 1, anoxic zone 2, aerobic zone 3 and water outlet zone 4, the bottom 5 of the pool corresponding to aerobic zone 2 is provided with an aeration system 6, and the aerobic zone 3 The interior is filled with light suspended fillers, and a first barrier structure 7 is set between the anaerobic zone 1 and the anoxic zone 2. The first water hole 8; the second barrier structure 9 is set between the anoxic zone 2 and the aerobic zone 3, and the second barrier structure 9 is connected to the pool side wall 10. A second water hole is set 11. Interception screens 14 are arranged at intervals on the second barrier structure 9, and the second water passage 11 is distributed between the interception screens 14, and agitators for preventing sludge from settling are arranged on the interception screens 14; the aerobic zone 3 and the water outlet area 4 are provided with a spacer screen 15, and the spacer screen 15 is provided with fillers for treating sewage. The fillers generally use SPR-1 type fillers; it can be known from the above description that in the aerobic zone It is filled with light suspended filler, which can retain nitrifying bacteria with a long generation time. There is a stirrer in the anoxic zone, and the nitrogen in the sewage is converted into nitrous nitrogen in the aerobic zone, and converted into Nitrogen, and the phosphorus contained in the sewage is removed by chemical methods in the anaerobic zone, and the utility model improves the efficiency of nitrogen removal.

In order to further improve the performance of the present utility model, as shown in Fig. 1, Fig. 2 and Fig. 3, the second barrier structure 9 is a barrier plate or a barrier wall, and interception screens 14 are arranged at intervals on the second barrier structure 9 Above, each intercepting screen 14 extends vertically from the upper edge of the blocking board or the blocking wall to the lower edge; the second water hole 11 is arranged at the lower part of the blocking board or the blocking wall between the blocking screens 14 . And the spacer screen 15 extends to both sides to the side wall 10 of the pool, extends upward to the upper edge of the pool, and extends downward to the bottom 5 of the pool. In particular, a mud discharger 16 is provided in the water outlet area 4, and a mixed liquid return pump 17 is provided at the end of the water outlet area for returning the effluent to the anoxic area from the internal nitrifying liquid and activated sludge. At least one flow pusher is arranged in the water outlet area, and at least one flow pusher 18 and flow pusher 19 are respectively arranged at both ends of the anoxic area close to the side wall of the pool. The horizontal cross-section of the sewage treatment pool in the utility model is circular, and of course the horizontal cross-section of the sewage treatment pool can be set as a square, ellipse or other shapes as required. Fillers capable of nitrifying and retaining nitrifying bacteria are arranged in the spacer screen 15 . It can be seen from the above description that the filler stays in the screen structure, and the sewage flows continuously in the sewage treatment tank, which prolongs the sewage residence time and aeration time, improves the efficiency of denitrification, and reduces the idle rate of equipment.

In order to describe the utility model in more detail, now take the daily treatment of 50,000 tons of domestic sewage as an example for illustration. The basic parameters of sewage water quality are: COD: 600mg/l; BOD ₅ : 200mg/l; TN: 50mg/l; NH4-N: 40mg/l; SS: 300mg/l. The above-mentioned sewage is run in the sewage treatment tank by the SBR method, and the pusher 17, the pusher 18 and the pusher 19 provide power to form a clockwise or counterclockwise circulation flow along the nearly cylindrical sewage treatment tank, so that the sewage Pass through the anaerobic zone 1, anoxic zone 2, aerobic zone 3 and effluent zone 4 at one time, carry out a chemical reaction in the anaerobic zone 1 to remove phosphorus, and in the aerobic zone 3, nitrogen in the sewage is removed by nitrifying bacteria. In the anoxic zone 2, the nitrite nitrogen is converted into nitrogen by denitrifying bacteria and released, and the sedimentation and decanting are carried out in the water outlet zone 4, due to the barrier between the first barrier structure 7 and the second barrier structure 9 Therefore, when sedimentation and decanting are performed, the sewage continues to enter the anaerobic zone 1, forming a continuous working process. The specific flow process of the sewage is indicated by the arrows in Figure 1 and Figure 2. Since the existing technology of the operation process of the SBR method is very mature, it will not be repeated here. The discharge water standard of above-mentioned sewage after being treated by the utility model is as shown in table 1 below. As shown in Table 1, it can be seen that the utility model improves the denitrification rate, and greatly reduces the values of COD, BOD5, TN and SS, and improves the discharge standard of treated water.

Table 1

project COD BOD ₅ TN NH4-N SS Effluent water quality (Class B) 60mg/L 20mg/L 20mg/L 8mg/L 20mg/L Removal rate (%) 90 90 60 80 93

To sum up, the utility model provides a kind of sewage treatment pool, by improving the structure of the sewage treatment pool in the prior art, and filling the corresponding filler in the relevant area, the sewage is treated continuously in a cycle, so that the sewage The treatment tank can work continuously, which reduces the idle rate of equipment; the sewage circulates in the sewage treatment tank, which increases the residence time of sewage in the effective area, improves the denitrification rate, improves the utilization rate of fillers, and reduces the cost of sewage treatment , which is a great progress in the prior art.

It should be understood that the above-mentioned descriptions for the preferred embodiments are relatively detailed, and cannot therefore be considered as limiting the protection scope of the utility model patent. In the case of the scope of protection of the new claims, various modifications such as replacement and simple combination can also be made, all of which fall within the protection scope of the utility model, and the scope of protection of the utility model should be based on the appended claims allow.

Claims (7)

1. treatment tank, it comprises anaerobic zone, oxygen-starved area, aerobic zone and exhalant region, it is characterized in that: be provided with aerating system at the bottom of the pond of aerobic zone correspondence, be filled with light suspended filler in the aerobic zone, be provided with first barrier structure between anaerobic zone and the oxygen-starved area, the bottom of this first barrier structure is provided with from anaerobic zone and crosses the water hole to first of oxygen-starved area input sewage; Be provided with second barrier structure between oxygen-starved area and the aerobic zone, this second barrier structure bottom is provided with second and crosses the water hole, on second barrier structure at interval be provided with the interception screen cloth, second crosses the water hole is distributed between the interception screen cloth, the interception screen cloth is provided with the agitator that prevents sludge settling; Be provided with screen cloth at interval between aerobic zone and the exhalant region.

2. treatment tank according to claim 1, it is characterized in that: above-mentioned second barrier structure is baffler or intercepts wall, being arranged on second barrier structure of interception screen cloth interval, each interception screen cloth all vertically extends to the lower edge from the upper edge of baffler or obstruct wall; Second crosses the bottom that the water hole is arranged in the baffler between the interception screen cloth or intercepts wall.

3. treatment tank according to claim 1 and 2 is characterized in that: above-mentioned interval screen cloth extends to the pond sidewall to both sides, extends upwardly to the upper edge, pond, extends downward at the bottom of the pond.

4. treatment tank according to claim 3 is characterized in that: be provided with mud exhauster in the above-mentioned exhalant region, nitrification liquid and activity sludge reflux are to the mixed-liquor return pump of oxygen-starved area in the exhalant region end is provided for water outlet gone.

5. treatment tank according to claim 4 is characterized in that: be provided with at least one impeller in the above-mentioned exhalant region, the oxygen-starved area is respectively arranged with at least one impeller near the two ends of pond sidewall.

6. treatment tank according to claim 5 is characterized in that: the cross section of above-mentioned treatment tank is for circular.

7. treatment tank according to claim 5 is characterized in that: being provided with in the screen cloth of above-mentioned interval can the nitrated filler of holding back nitrobacteria.

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