LT6462B - Method of ozone treatment of sewage pumping stations - Google Patents

Abstract

The invention relates to the method of ozone treatment of domestic and industrial sewage pumping stations in order to reduce emissions of pollutants and toxic gases and to eliminate bad smells that accompany such sewage pumping stations. The system consists of programmable ozonators (4) connected to a humidity sensor (6), and their direct and/or remote control intelligent telecommunications equipment (5) connected to the system by wired and/or wireless communication. The system characterizes in that the ozonators (4) stop functioning when the moisture content inside the building reaches 85% and informs the operator by a short message about suspended ozonation system operation. After lowering moisture content below 80%, briefly activates the ozonation fan (7), dries the ozonators (4), then activates the entire ozonation system and informs the operator about the restored functioning of the ozonation system by a short message.

Description

The invention relates to a process for the treatment of domestic and industrial wastewater pumping stations with ozone. The method is intended to improve existing ozonation systems by eliminating deficiencies which have become apparent during the operation of such systems.

Domestic wastewater pumping stations are located in different urban residential areas adjacent to residential and commercial and industrial buildings and are designed to centrally collect wastewater from residential and industrial buildings in the relevant urban suburbs and further pump them into urban municipal wastewater biological treatment plants. Because wastewater flows through open channels in sewage pumping stations, high concentrations of gases such as hydrogen sulphide and methane are accumulated in sewage pumping station facilities. Since most sewage pumping stations are located in residential areas, residents often complain of odors emanating from sewage pumping stations. Sewage pumping stations often contain concentrations of sulfur hydrogen in excess of the permissible hygiene standards, and workers servicing sewage pumping stations often run the risk of hydrogen sulfide poisoning.

The closest prototype is described in Lithuanian patent no. 5977. The invention relates to a process for the treatment of domestic and industrial wastewater pumping stations with ozone to reduce emissions of pollutants and toxic gases and to eliminate the odor accompanying such wastewater pumping stations. The system consists of programmable ozonators and their direct and / or remote smart telecommunication devices connected to the system via wired and / or wireless connections. The ozone generator has a central control unit which can be used to program the automatic start-up time and operating mode of the ozone generator. Using modern communication tools, the operation of ozone generating equipment can be monitored and controlled remotely from a central control panel and through smart devices.

Due to their good oxidation properties, ozone O ₃ is consumed organic waste oxidation destroys bacteria and other harmful microorganisms, which reacts with sulfur, carbon, which has an unpleasant rotten egg "odor, form an odorless water and sulfur dioxide molecules significantly reduce the methane gas concentration in the room, and, after a few minutes, re-converts to molecular oxygen O2. In this way, clean and odorless air is discharged into the environment through the vents of the sewage pumping stations. The comparative properties of the oxidation potentials of ozone and other oxidants are given in Table 1:

COMPARATIVE CHARACTERISTICS OF OXIDATION POTENTIALS

Oxidant Oxidation potential Ozone 2.07 Hydrogen peroxide 1.77 Potassium permanganate 1.67 Chlorine dioxide 1.57 Hypochlorite acid 1.49 Chlorine gas 1.39

However, one major drawback has emerged over the long period of use of ozonation systems at sewage pumping stations. Its essence is that all sewage pumping stations have quite high humidity. In all of them, the sewage flows in an open channel, and if there is a sudden heavy rainfall or a sudden melting of snow, then the water level sometimes reaches up to two meters. The fluid permeability of the sewerage channel is too low to allow free passage of the significantly increased volume of wastewater and water, which results in wastewater pumping stations being filled. There are still cases where sewage pumping stations are swollen due to a clogged canal or various faults.

The main problem is that when the sewage pumping station is flooded, the indoor air humidity reaches up to 100% humidity. Virtually no electronic equipment is suited for long periods of time when indoor humidity is 90% and above, and it is only a matter of time before it will stop working.

In a simpler case, to solve this problem, ozonation equipment is installed in boxes along with moisture-collecting packages. However, they need to be replaced regularly, delayed, the problems mentioned above and the risk of loss of equipment.

This disadvantage was remedied by inserting an air humidity measurement device - the sensor - into the ozone system and linking it electrically and programmatically to the entire ozone system. The processor of the ozonation equipment is programmed such that when the humidity sensor detects an 85% humidity concentration in the indoor air, the ozonation equipment shuts down. At the same time, the processor of the ozonation equipment informs the operator monitoring the ozonation systems remotely about the situation at the relevant sewage pumping station.

When the air humidity sensor detects that the indoor humidity level has dropped below 80%, the ozonator fans first turn on for a few minutes to prevent the system's ozonator from drying, before the full ozonation system is turned on. The system operator shall be informed by means of an appropriate short message regarding the resumed operation of the ozonation system.

The invention will now be described in more detail with reference to the accompanying drawing, which is a schematic representation of an improved system.

This figure shows a sewage pumping station 1 for the central collection of wastewater 2 from a large number of sewage pumping stations located in a residential area or urban area. The wastewater 2 is then pumped from the wastewater pumping station 1 to a biological wastewater treatment plant located outside the city where it is biologically treated, separating the sludge and clean water.

The sewage pumping station is always accompanied by unpleasant odors associated with the outward flow of hydrogen sulphide and methane gas through the vents 3 of the sewage pumping station, as well as various microorganisms resulting from the degradation of sewage. Therefore, a closed ozonation system consisting of ozonators 4 located at different locations in the sewage pumping station is installed inside the sewage pumping station 1. The amount and capacity of the ozonators 4 are selected depending on the size of the sewage pumping station 1 and the amount and concentration of wastewater 2 stored there. In essence, ozonators 4 are devices that generate high-frequency and high-voltage surface discharge that ozonates air, converting molecular oxygen O2 to ozone O3. The resulting ozone is distributed throughout the sewage pumping station 1 from the higher concentration points to the lower concentration sites, according to the gas concentration law. The ozonators 4 can be controlled synchronously or separately.

The ozonator 4 has a microprocessor 4, either integrated or separate, that can be programmed to activate the ozonator or ozonator 4 activation time and duration. These ozonator activity parameters are selected and determined based on the size of the wastewater pumping station and the concentration and composition of the wastewater collected there.

The ozonator 4 can be wirelessly connected to the remote control 5, which can monitor the operation of a particular wastewater pumping station ozonation system and change or adjust its operating parameters via a monitor installed in the operator. The same monitoring and programming capabilities are available to individual operators servicing ozone systems at sewage pumping stations through smart devices connected to a common ozone system.

Due to its good oxidizing properties, ozone is consumed during the oxidation of organic waste, destroys bacteria and other harmful microorganisms, and reacts with hydrogen sulfide, which has the unpleasant smell of rotten eggs, to form odorless water and sulfur dioxide molecules, significantly reducing indoor methane gas concentration. is converted to molecular oxygen O2 for several minutes. In this way, purified and odorless air is discharged into the environment through the vents 3 of the sewage pumping station 1.

Separate malfunctions of the ozonation system of sewage pumping stations were observed, when the indoor humidity reached and exceeded 90%. By their nature, sewage pumping stations are static to collect wastewater 2. Depending on their volume, wastewater temperature, ambient temperature, time of year, the moisture concentration inside wastewater pumping station 1 is naturally increased and fluctuates. Often sewage pumping stations are flooded. Sometimes the humidity in such rooms reaches 100%. Over time, moisture enters the inside of the ozonator 4, which adversely affects its components, especially the electronic ones. This causes equipment damage. In the event of a failure of the ozonators 4, all pollutants inevitably pass outside the building and spread to the environment.

To eliminate this problem and to preserve the effectiveness of the ozonators 4, an additional device, a humidity sensor 6, electrically and programmatically coupled to the ozonators 4, was inserted into the ozonation system so that when the humidity sensor records 85% humidity in the air, the ozonators 4 are off. At the same time, the processor of the ozonation equipment informs the operator monitoring the ozonation systems remotely about the suspended operation of the ozonation equipment at the problematic sewage pumping station.

When the air humidity sensor detects that the humidity level in the room has dropped below 80%, the ozonator 4 fans 7 are first turned on for a few minutes to prevent the system's ozonator 4 from drying, before the full ozonation system is turned on. At the same time, the processor of the ozonation equipment informs the operator monitoring the ozonation systems remotely about the updated operation of the ozonation equipment at the appropriate sewage pumping station.

This improvement in the ozonation system by eliminating the humidity sensor 6 and connecting it electrically and programmatically to the ozonators 4 eliminated the risk of failure of the ozonation system.

Claims (2)

Ozonation method for wastewater collection and pumping stations, including ozone treatment of polluted air, using an ozonation system consisting of programmable ozonators and their on-board and / or remote smart telecommunication devices connected to the system by wired and / or wireless communications and purified and odorless air emission, characterized by measuring the indoor humidity concentration using a humidity sensor (6), when the indoor humidity reaches 85%, switches off the ozonators (4) and informs the Ozone System Operator via SMS When the humidity inside the building drops below 80%, the fan (7) is briefly switched on and dehumidified ozonators (4) are prevented, all ozonators (4) are switched on and a short message informs the operator of the restoration of the ozonation system. 2. A method according to claim 1, characterized in that the fans (7) are turned on for 5 to 10 minutes.