Wastewater from vacuum tanks enters special reception points of sewage treatment plants (SWS) through ground drain wells. It is at these points that the primary discharge occurs. drainerAfter that, the waste is sent to the reservoirs-sludge tanks for mechanical cleaning from large debris and sand. This process is strictly regulated by sanitary standards, since direct discharge of contents into water bodies or on the terrain is strictly prohibited and entails serious environmental consequences.
After entering the sewerage system, the liquid undergoes a multi-stage filtration system, where solid fractions are separated, and the water is subjected to biological purification. It is important to understand that drainer It is not the final point of disposal, but only a transport link delivering sewage to the place of their disinfection. Depending on the type of pollution and the volume of incoming wastewater, the fate of the waste can vary: from a full treatment cycle to discharge to special silt sites.
The technical process of draining requires compliance with certain parameters of pressure and feed rate to avoid overflowing of receiving chambers. Equipment operators monitor the level of liquid in the tank and the pressure in the hose using manometer and the shut-off valve. Violation of the drain technology can lead to emergency situations at the sewage treatment plants, so all actions of the personnel are controlled by automation and dispatching services.
Reception points and sewer pumping stations
The first destination for drainage equipment is specialized reception points equipped for rapid and safe emptying of tanks. These are complex engineering structures where drain-drive They come to drain the contents. The design of the receiving well allows you to hermetically connect the drain sleeve of the machine with the sewer network, excluding the spillage of sewage to the surface of the earth.
Within the system of the CNS installed powerful pumps that pump the incoming sewage to further stages of cleaning. If the terrain allows, a gravity system is used, but in most cases forced pumping is required. Pumping equipment designed to work with aggressive environments and the presence of solid inclusions, which ensures the smooth operation of the entire drainage system.
⚠️ Attention: The draining of sewage into storm sewers or ordinary household wells without the appropriate permit is strictly prohibited and is punishable by heavy fines.
Control of the receipt of waste is carried out automatically, recording the volumes and time of arrival of each machine. This allows you to optimize the load on the treatment plants and plan the schedules of equipment maintenance. Separate receiving lines may be provided for each type of effluent, which prevents mixing of incompatible chemicals.
Mechanical cleaning and disposal of solid waste
After receiving the wastewater, the primary processing stage begins, the purpose of which is to remove large solid inclusions. This stage is used lattice and sieve-drum, which trap garbage, rags, plastic and other items that have fallen into the sewer. Without this stage, subsequent biological cleansing would not be possible due to the risk of clogging pipes and damage to the pumps.
Separate solid waste is transported by conveyor belts into containers for further export to landfills of solid household waste. The liquid fraction, freed from large debris, flows into the sands. Here, under the influence of gravity, heavy mineral particles such as sand, gravel and glass fragments are deposited, which are also removed mechanically.
Grid technology
The grilles can be manual or automatic. Automatic models are equipped with rakes that continuously rake garbage onto a moving tape. This allows to minimize the contact of staff with sewage and increase the hygiene of the process.
The efficiency of mechanical cleaning directly affects the quality of biological filters. If large particles get into aerotanks, they can disrupt the vital activity of bacteria or create zones of stagnation. So, the state of mechanical filters It is constantly monitored and if necessary replaced or cleaned.
Biological wastewater treatment
After removing the solid fractions, water enters the aerotanks, where the main cleaning process takes place - the biological oxidation of organic pollutants. These tanks maintain optimal conditions for reproduction. sludgeIt is a community of bacteria and simple microorganisms. They absorb organic matter, turning it into safe compounds.
For the vital activity of bacteria, oxygen is needed, so air is constantly supplied to the aerators. The process of mixing and oxygen saturation is controlled by sensors, ensuring a uniform distribution of microorganisms over the volume of the reservoir. Biological clean-up It can remove up to 90-95% of organic contaminants contained in wastewater.
- 🦠 Aerobic bacteria break down organic matter in the presence of oxygen.
- 💨 The aeration system ensures a constant flow of air.
- 🧪 Controlling pH and temperature optimizes the process.
- 💧 Secondary sediments separate purified water from silt.
After aerotanks, a mixture of water and silt enters the secondary settling tanks. Here, phase separation occurs: purified water rises up and is sent for repurification, and heavy active sludge settles to the bottom. Some of the sludge is returned to the beginning of the process to maintain the concentration of biomass, and the excess is removed for further processing.
Recycling of sludge and sludge sites
Excessive active sludge formed during the cleaning process is sent to special structures for stabilization and dehydration. They are often used for this purpose. methane-teenwhere in anaerobic conditions (without oxygen access) fermentation of the sediment occurs. This process produces biogas that can be used to generate electricity or heat for treatment plants.
After fermentation, the sludge enters sludge platforms or mechanical dehydrators (centrifuges, filter presses). In open areas, there is a natural drying and mineralization of sediment under the influence of the sun and air. This process takes a long time, but allows you to obtain a product suitable for use as fertilizer or land recultivation.
Modern technologies allow processing of sediment into granular fertilizer, which is in demand in agriculture. However, before use, such a product undergoes strict radiation and chemical control. If the sludge contains toxic substances, it is classified as a hazardous waste and is subject to disposal in special landfills.
Filtration and discharge fields into water bodies
Purified wastewater that has passed all stages of treatment can be sent to the filtration fields or discharged into water bodies. Filtration fields are areas of land with a specific soil composition through which water is passed. Passing through the soil horizons, water undergoes additional natural purification and enters the groundwater is already safe.
Discharge into surface water bodies is possible only if the normative indicators of purity are achieved. Before release into a river or lake, the water is disinfected, most often chlorinated or treated with an ultrafilter. Quality control The discharged water is carried out in laboratories in a continuous mode, and any deviations from the norm lead to a stop of discharge.
| Parameter | Reset standard (mg/l) | Method of control | Frequency of verification |
|---|---|---|---|
| Suspended substances | 3-5 | Filtration | Daily |
| BOD (Biochemical Oxygen Consumption) | 3-6 | Incubation | 3 times a week |
| Ammonium nitrogen | 0.5-1 | Photometry | Weekly |
| phosphorus | up to 0.2-0.5 | Him. analysis | Weekly |
In winter, the filtration fields can be difficult to operate, so this time of year the emphasis is on deep biological cleaning and disinfection before discharge. Environmental monitoring The water bodies below the discharge point allow to quickly identify any negative changes in the ecosystem.
Legal aspects and environmental control
The collection and disposal of waste is strictly regulated by law. Owners drainage-carrying must have a license to carry out activities for collection, transportation and disposal of waste. The routes of the equipment and the drain point are recorded in the travel lists, which are checked by environmental services.
⚠️ Warning: Unauthorized discharge of sewage in the wrong places is a criminal offence and causes irreparable harm to the environment.
Environmental control is carried out not only by state bodies, but also by internal services of enterprises. The treatment plants have video surveillance cameras and sensors that record each act of draining. Any deviation from the rules shall be recorded and investigated.This ensures a high level of discipline among the performers.
Modern GPS tracking systems allow dispatchers to track the location of each machine in real time. This eliminates the possibility of waste being dumped in the forest or on the side of the road. The transparency of the process ensures that all sewage pumped from septic tanks and cesspools actually ends up in the treatment plant.
The whole path of sewage from the drainage machine to discharge into the reservoir is controlled and regulated, ensuring environmental safety.
Frequently Asked Questions (FAQ)
Can I drain sewage into a regular sewer?
Drainage is possible only in special reception points of sewage treatment facilities (CNS), equipped for receiving large volumes of wastewater. Draining into the household sewer is prohibited due to the risk of overflow and damage to small diameter pipes.
What happens to sewage after draining?
After draining, the wastewater undergo mechanical cleaning from garbage, biological cleaning with bacteria in aerotens, settling and disinfection. The solid sludge is dehydrated and disposed of, and the purified water is discharged into the water bodies.
Where does the silt go after cleaning?
Excess silt is sent to the methane tanks for fermentation, after which it is dehydrated on silt sites or centrifuges. Depending on the composition, it can be used as fertilizer or exported to solid waste landfills.
Do I need a license to remove waste?
Yes, a license is required for legal activities for the collection and transportation of liquid waste. Work without a license entails administrative and criminal liability.
Is the slurry station equipped?:Yes|Need
Does the carrier have a license?:Yes.NET
Is there a logbook?:Yes.NET-
Tip: When ordering the services of a sewer, always require a check or a document confirming the disposal of waste at the official reception point.