CN104163491A - Petrochemical sewage treatment system by pulse water-distribution hydrolysis and acidification and application method thereof - Google Patents

Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a petrochemical sewage treatment system by pulse water-distribution hydrolysis and acidification and an application method thereof. The system comprises a bell-jar siphon pulse water distributor and a matched hydrolysis and acidification tank, wherein the pulse water distributor comprises a cylinder, a retractable bell jar and a bracket thereof, a central water outlet pipe with adjustable fixed position, an auxiliary siphon tube, an air communicating tube, a water inlet tube, an evacuation tube and a cover; and the hydrolysis and acidification tank comprises a tank body, a primary water distributor, a secondary water distributor, a water outlet, an overflow weir, a water collecting channel, an overflow port, a section sampling port and an evacuation and sludge discharge port. In the application process, the system is applied, and wastewater enters the hydrolysis and acidification tank through the water outlet pipe of the pulse water distributor. The system does not need any power other than the lifting pump, is easy to maintain, and has the advantages of stable performance, uniform water distribution and favorable sludge-water mixing effect. The pulse water-distribution hydrolysis and acidification device has favorable application prospects in petrochemical wastewater treatment.

Description

A pulse-distributed water hydrolysis acidification petrochemical sewage treatment system and its application method

technical field

The invention belongs to the technical field of water treatment, in particular to a pulse water distribution hydrolysis acidification petrochemical sewage treatment system and an application method thereof.

Background technique

Petrochemical wastewater has the characteristics of large wastewater volume, complex water quality, high toxicity, large water quality fluctuations, high concentration, and difficult biodegradation. It is a relatively difficult industrial wastewater to treat. Therefore, it is necessary to carry out appropriate pretreatment technology for petrochemical wastewater to change its pollutant structure, reduce the concentration of poisonous substances, and improve its biodegradability. Hydrolytic acidification is an anaerobic treatment process (Ding Lei, Qi Peishi, Zhao Yixian. 2012. Research on the evaluation system of hydrolytic acidification process. Environmental Engineering, 30(6):65-68). It can hydrolyze suspended solids and macromolecular refractory substances in wastewater into dissolved organic matter, easily biodegradable small molecule substances and volatile fatty acids, improve the biodegradability of wastewater, and thus improve the operation effect of subsequent biological treatment processes; at the same time It has the characteristics of high load, less mud production, low energy consumption, small nutrient demand, strong impact load resistance, insensitive to water temperature and pH changes, and easy to control. Therefore, the hydrolytic acidification process is widely used in the treatment of refractory petrochemical wastewater.

In order to ensure sufficient contact between sludge and wastewater in the hydrolytic acidification tank, mechanical agitation and hydraulic agitation are generally used to enhance the mud-water mixing effect. In practical applications, there are disadvantages such as sludge deposition, power consumption, and equipment corrosion.

The water intake mode of the hydrolytic acidification tank is divided into continuous water intake and intermittent pulse water intake. The continuous flow of water can achieve relatively uniform water distribution, but there are problems of large head loss and easy blockage of the water outlet. The pulsed water inlet can form a high-speed fluid to impact the bottom sludge in the tank, so that the sludge and sewage can be fully mixed without consuming power, so it is a better water inlet method.

Pulse water distributors can generally be divided into switch type and siphon type. The switch type uses the automatic control device to control the solenoid valve or electric valve according to the working conditions and process requirements to form pulses. The switch-type pulse water distributor is precise in control, but the equipment cost and operating cost are relatively high, and it is prone to failure due to long-term operation.

The siphon pulse water distributor uses the fast-flowing water in the siphon to take away the air in the main pipe, so that a certain degree of vacuum is formed in the main pipe, and the water in the container enters the main pipe and is discharged into the pool under the action of the atmospheric pressure inside and outside the pipe. . Due to the fast water flow, the water distribution can be completed in a short time, achieving the effect of pulse, stirring up the sludge at the bottom of the pool, so that it can be continuously and fully mixed with the wastewater in the pool, and the organic matter in the sludge and sewage can be fully contacted and reacted. Thereby, the mud-water mixing effect of the hydrolytic acidification tank is improved, and the treatment efficiency is improved.

Contents of the invention

Aiming at the deficiencies of the prior art, the invention provides a set of hydrolytic acidification equipment, including a pulse water distributor and a hydrolysis acidification tank. Among them, the pulse water distributor provides high-efficiency energy-saving, stable and reliable pulse effects, and can realize single pulse volume, pulse time and pulse period under different flow conditions. The center outlet pipe and the air gap of the bell can be adjusted Tune. It can study the pulse conditions suitable for petrochemical wastewater under different conditions, and can adapt to the requirements of pulse water distribution under various working conditions. The hydrolytic acidification tank optimizes the diameter of each water distribution pipe and the size and position of the outlet hole through numerical simulation calculations. With the pulser, it can achieve uniform water distribution, prevent pipe hole blockage, strengthen the mixing effect of mud and water, and enhance biological activity and mass transfer.

A pulse water distribution hydrolysis acidification petrochemical sewage treatment system, the system is composed of a pulse water distributor and a hydrolysis acidification tank, wherein the pulse water distributor consists of a cylinder, a telescopic bell, a bracket, a central outlet pipe, an auxiliary siphon, an atmospheric The connecting pipe, water inlet pipe, emptying pipe and cylinder cover; the hydrolysis acidification tank is composed of the tank body, the first-level water distribution pipe, the second-level water distribution pipe, the outlet hole, the overflow weir, the sump, the overflow pipe, the sampling port along the process and the Empty sludge discharge port configuration;

A bracket is set in the cylinder, and a telescopic bell jar is arranged on the bracket. The telescopic bell jar is composed of a male buckle section and a female buckle section, wherein one end of the male buckle section is fixedly connected (welded) to the bracket, and the female buckle section The other end of the cylinder is sealed by a blind plug; the top of the cylinder is provided with a cylinder cover, and the bottom of the cylinder is provided with a water inlet pipe; the top of the auxiliary siphon is fixedly connected with the bottom of the cylinder, and the bottom is connected with the top of the primary water distribution pipe; The bottom is connected to the auxiliary siphon pipe through the vent pipe; a valve (ball valve) is set on the vent pipe; the auxiliary siphon pipe is connected to the atmospheric communication pipe; a central water outlet pipe with an adjustable fixed position is set in the auxiliary siphon pipe, and the top of the central water outlet pipe is located at the telescopic The bell jar, the bottom end is located in the first-level water distribution pipe;

A pool body is set under the cylinder body, a secondary water distribution pipe is arranged horizontally in the pool body, and a water outlet is set on the secondary water distribution pipe; a primary water distribution pipe is arranged perpendicular to the secondary water distribution pipe, and the bottom end of the primary water distribution pipe The water pipes are connected; the top of the pool is provided with an overflow weir, the top of the overflow weir is provided with a sump, and the bottom of the sump is provided with an overflow pipe; the bottom of the pool is provided with an emptying and mud discharge port; Valves (ball valves) are respectively arranged on the venting mud outlets.

A valve (ball valve) is arranged on the water inlet pipe.

The central water outlet pipe is a pipe body with a male buckle of a certain length at the top.

The central water outlet pipe is connected with the barrel body and the bracket through threaded buckles respectively.

The secondary water distribution pipes are centered on the bottom end of the primary water distribution pipes and are evenly distributed in the shape of a "meter".

An application method of a pulsed water distribution hydrolysis acidification petrochemical sewage treatment system, the pulse process is as follows:

Sewage flows into the cylinder of the pulsator from the water inlet pipe through the lifting pump; when the liquid level in the cylinder reaches the bottom of the telescopic bell, the air in the telescopic bell, the central outlet pipe and the auxiliary siphon is sealed, and the liquid in the cylinder As the level continues to rise, the above-mentioned sealed air is discharged through the atmospheric communication pipe due to water pressure; when the liquid level in the telescopic bell rises to the top of the central outlet pipe, the central outlet pipe begins to overflow with sewage, and further discharge is sealed At the same time, the liquid level in the center outlet pipe will be higher than the liquid level in the first-level water distribution pipe. This liquid level difference will cause the liquid level in the center outlet pipe to decrease, causing the air pressure in the center outlet pipe to be less than one atmospheric pressure, which is in a negative pressure state. Then a siphon is formed, and the sewage in the cylinder is injected into the pool at high speed through the telescopic bell jar, the central outlet pipe, the primary water distribution pipe, the secondary water distribution pipe and the water outlet hole; when the liquid level in the cylinder drops to the telescopic bell jar At the bottom, air enters the retractable bell jar, destroys the original negative pressure state, and the siphon stops.

The above-mentioned pulse water distributor can be made of organic glass, stainless steel and other materials.

The beneficial effects of the present invention are:

The high-speed sewage in the system of the present invention has better stirring effect on the sludge at the bottom of the hydrolysis acidification tank. Sludge realizes periodic expansion and compression. The whole system does not need other power except the lifting pump, easy to maintain, stable performance, uniform water distribution, and good mud-water mixing effect.

Description of drawings

Fig. 1 is the schematic diagram of the device structure of the pulse water distribution hydrolysis acidification petrochemical sewage treatment system of the present invention;

Fig. 2 is the device structural representation of retractable bell jar of the present invention;

Fig. 3 is a schematic diagram of the device structure of the secondary water distribution pipe of the present invention;

Numbers in the figure: 11-Cylinder body, 12-Telescopic bell jar, 12A-Male buckle section, 12B-Female buckle section, 13-Bracket, 14-Central water outlet pipe, 15-Auxiliary siphon pipe, 16-Atmospheric communication pipe, 17 -Inlet pipe, 18-Empty pipe, 19-Cylinder cover, 21-Pool body, 22-First-level water distribution pipe, 23-Secondary water distribution pipe, 24-Water outlet, 25-Overflow weir, 26-Sink, 27-Overflow pipe, 28-Sampling port along the way, 29-Empty mud discharge port.

Detailed ways

The present invention provides a pulsed water distribution hydrolysis acidification petrochemical sewage treatment system and its application method. The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

A pulse water distribution hydrolysis acidification petrochemical sewage treatment system, the system is composed of a pulse water distributor and a hydrolysis acidification tank, wherein the pulse water distributor consists of a cylinder 11, a telescopic bell 12, a bracket 13, a central outlet pipe 14, Auxiliary siphon pipe 15, atmospheric communication pipe 16, water inlet pipe 17, vent pipe 18 and cylinder cover 19; the hydrolysis acidification tank is composed of pool body 21, primary water distribution pipe 22, secondary water distribution pipe 23, water outlet hole 24, overflow weir 25. It is composed of a water collection tank 26, an overflow pipe 27, a sampling port 28 along the way, and a mud discharge port 29;

A support 13 is arranged in the cylinder body 11, and a telescopic bell case 12 is arranged on the support 13. The telescopic bell case 12 is formed by connecting a male buckle section 12A and a female buckle section 12B, wherein one end of the male buckle section 12A is connected to the support 13 Fixedly connected (welded), the other end of the female buckle section 12B is sealed by a blind plug; the top of the cylinder 11 is provided with a cylinder cover 19, and the bottom of the cylinder 11 is provided with a water inlet pipe 17; the top of the auxiliary siphon 15 is fixed to the bottom of the cylinder 11 The bottom end is connected to the top of the primary water distribution pipe 22; the bottom of the cylinder body 11 is connected to the auxiliary siphon pipe 15 through the vent pipe 18; a valve (ball valve) is set on the vent pipe 18; the auxiliary siphon pipe 15 is connected to the atmospheric communication pipe 16 ;In the auxiliary siphon 15, a central water outlet pipe 14 with an adjustable fixed position is set, the top of the central water outlet pipe 14 is located at the telescopic bell jar 12, and the bottom end is located at the primary water distribution pipe 22;

A pool body 21 is arranged below the cylinder body 11, a secondary water distribution pipe 23 is horizontally arranged in the pool body 21, and a water outlet 24 is arranged on the secondary water distribution pipe 23; a primary water distribution pipe 22 is arranged perpendicular to the secondary water distribution pipe 23, and a primary The bottom of the water distribution pipe 22 is connected to the secondary water distribution pipe 23; the top of the pool body 21 is provided with an overflow weir 25, the top of the overflow weir 25 is provided with a sump 26, and the bottom of the sump 26 is provided with an overflow pipe 27; the bottom of the pool body 21 is provided with a vent Mud outlet 29; pool body 21 is provided with sampling port 28 along the way; valves (ball valves) are respectively set on the sampling port 28 and the venting mud outlet 29.

A valve (ball valve) is set on the water inlet pipe 17 .

The central water outlet pipe 14 is a pipe body with a male buckle of a certain length at the top.

The central water outlet pipe 14 is connected with the cylinder body 11 and the bracket 13 respectively through threaded fasteners.

The secondary water distribution pipe 23 is centered on the bottom end of the primary water distribution pipe 22 and is evenly distributed in the shape of a "rice".

Example 1

The structure of the pulsed water distribution hydrolysis acidification petrochemical sewage treatment system adopted in this embodiment is shown in Figures 1 to 3, wherein the volume of a single pulse can be adjusted by adjusting the length of the telescopic bell 12, and can be adjusted by a threaded button The relative distance between the center outlet pipe 14 and the telescopic bell 12 top.

The effective volume of the pulse water distributor used in the experiment can be adjusted from 1L to 5L, and the pulse water head is 1m. The hydrolytic acidification tank is a plexiglass column with a diameter of 300mm and a height of 2500mm, and the effective volume is 150L.

Taking the actual sewage discharged in a petrochemical industrial park (water quality indicators are shown in Table 1) as the treatment object, the influent chemical oxygen demand (COD) is 400mg/L-600mg/L, the hydraulic retention time is 20h, and the pulse frequency 10 times/h, water temperature 25-28 degrees, using the above-mentioned pulse hydrolysis acidification reactor operation results show that: COD removal rate is 15%-20%, the proportion of volatile acid in the effluent is from 18%-24% of the influent water % increased to 32% to 45%, the mud and water are well mixed, and there is no sludge deposition.

Table 1 Water quality index of petrochemical wastewater (mg/L, volatile acid is calculated as acetic acid) data table

Claims (6)

1. a pulse water distribution acidication petrifaction sewage treatment system, it is characterized in that: this system consists of pulse water distributing device and hydrolysis acidification pool, wherein, pulse water distributing device consists of cylindrical shell (11), telescopic bell jar (12), support (13), central water outlet pipe (14), auxiliary siphon pipe (15), atmospheric communicating pipe (16), water inlet pipe (17), blow-down pipe (18) and cover (19); Hydrolysis acidification pool is by pond body (21), one-level water distributor (22), secondary water distributor (23), posticum (24), overflow weir (25), water leg (26), upflow tube (27), form along journey thief hole (28) and emptying mud discharging mouth (29);

Support (13) is set in cylindrical shell (11), telescopic bell jar (12) is set on support (13), described telescopic bell jar (12) formation that is connected with box section (12B) by pin thread section (12A), wherein one end of pin thread section (12A) and support (13) are fixedly linked, and the other end of box section (12B) is sealed by blind plugging; Described cylindrical shell (11) top arranges cover (19), and cylindrical shell (11) bottom arranges water inlet pipe (17); The auxiliary top of siphon pipe (15) and the bottom of cylindrical shell (11) are fixedly linked, and bottom is connected with the top of one-level water distributor (22); The bottom of cylindrical shell (11) is connected with auxiliary siphon pipe (15) by blow-down pipe (18); Blow-down pipe arranges valve on (18); Auxiliary siphon pipe (15) is connected with atmospheric communicating pipe (16); The central water outlet pipe (14) that adjustable fixed position is set in auxiliary siphon pipe (15), the top of central water outlet pipe (14) is positioned at telescopic bell jar (12), and bottom is positioned at one-level water distributor (22);

In cylindrical shell (11) below, pond body (21) is set, in pond body (21), is horizontally disposed with secondary water distributor (23), on secondary water distributor (23), set out the mouth of a river (24); Perpendicular to secondary water distributor (23), one-level water distributor (22) is set, the bottom of one-level water distributor (22) is connected with secondary water distributor (23); Pond body (21) top arranges overflow weir (25), and overflow weir (25) top arranges water leg (26), and water leg (26) bottom arranges upflow tube (27); Pond body (21) bottom arranges emptying mud discharging mouth (29); On pond body (21), arrange along journey thief hole (28); Along on journey thief hole (28) and emptying mud discharging mouth (29), valve being set respectively.

2. a kind of pulse water distribution acidication petrifaction sewage treatment system according to claim 1, is characterized in that: described water inlet pipe arranges valve on (17).

3. a kind of pulse water distribution acidication petrifaction sewage treatment system according to claim 1, is characterized in that: described central water outlet pipe (14) has the body of certain length pin thread for top.

4. a kind of pulse water distribution acidication petrifaction sewage treatment system according to claim 1, is characterized in that: between described central water outlet pipe (14) and cylindrical shell (11) and support (13), be connected respectively by screw thread.

5. a kind of pulse water distribution acidication petrifaction sewage treatment system according to claim 1, is characterized in that: described secondary water distributor (23), centered by one-level water distributor (22) bottom, is " rice " font and is uniformly distributed.

6. the application method of a kind of pulse water distribution acidication petrifaction sewage treatment system as described in claim 1～5 any one claim, is characterized in that, pulse process is as follows:

Sewage is flowed in pulser cylindrical shell (11) by lift pump by water inlet pipe (17), when in cylindrical shell (11), liquid level reaches telescopic bell jar (12) bottom, air in telescopic bell jar (12), in central water outlet pipe (14) and in auxiliary siphon pipe (15) is sealed, along with the continuation rising of the interior liquid level of cylindrical shell (11), above-mentioned sealing air is because hydraulic pressure is discharged from through atmospheric communicating pipe (16), in telescopic bell jar (12), liquid level is increased to behind central water outlet pipe (14) top, central water outlet pipe (14) starts there is sewage overflow, and further discharge sealed air, can make the liquid level in central water outlet pipe (14) higher than the liquid level of one-level water distributor (22) simultaneously, this liquid level difference impels the interior liquid level of central water outlet pipe (14) to reduce, cause the air pressure in central water outlet pipe (14) to be less than a normal atmosphere, be negative pressure state, and then formation siphon, sewage in cylindrical shell (11) is passed through to telescopic bell jar (12), central water outlet pipe (14), one-level water distributor (22), secondary water distributor (22) and posticum (24) are to inject at a high speed pond body (21), when the liquid level in cylindrical shell (11) is down to telescopic bell jar (12) bottom, air enters in telescopic bell jar (12), destroys original negative pressure state, and siphon stops.