Sewage Treatment Station

Sewage treatment is one of the most important environmental measures. Modern environmental legislation obliges all business facilities to be equipped with wastewater treatment plants in order to ensure high-quality wastewater treatment for their further entry into the sewer network or discharge into water bodies.

But the achievement of the valid regulatory requirements in the Russian Federation for the quality of treated wastewater discharged into water bodies is impossible without the implementation of technologies for the nitrogen and phosphorus removal, as well as deep oxidation of organic compounds.

The implementation of these technologies requires an increase of the aeration tanks volume by a factor of 2.0-2.5 compared with the volumes of structures where only the processes of oxidation of organic compounds are realized at the same costs and quality of incoming wastewater.

The company NPP RUSMET designs and manufactures block-modular wastewater treatment plants with full factory readiness both in classical technology (with denitrification zones) and in advanced wastewater treatment technology in a batch reactor (SBR - Sequencing batch reactor).

SBR technology allows you to maintain an increased dose of activated sludge in the construction of 5-8 g/l (against a dose of activated sludge of 2.0-3.0 g/l in aeration tanks + secondary sump technologies) due to the fact that the sludge separation process in theSBRreactor occurs at rest (in secondary clarifiers, this process occurs when fluid moves from the entrance to the structure to its exit). Maintaining increased doses of activated sludge in SBR makes it possible to reduce the implementation time of biochemical processes by a factor of 2–3 compared with the implementation time of similar processes in the aeration tank + secondary sump technology.

The sewage treatment plant includes the following main technological stages and systems:

• mechanical treatment of sewage from rough inclusions and trapping of sand;
• collection, averaging and pressure supply of untreated sewage to the biological treatment stage;
• reagent wastewater treatment;
• biological treatment in the SBR reactor;
• mechanical tertiary treatment on multilayer filters;
• wastewater disinfection;
• sludge dehydration.

Wastewater from the sewage facility is supplied under pressure through the sewer network from the sewage pump station to the primary mechanical treatment unit. Garbage is collected in a garbage container, where it is collected and disposed of as necessary.

Wastewater after mechanical treatment is transferred by gravity to the sewage average storage tank. The tank is equipped with a submersible mixer, float level sensors, submersible sewage pumps for biological treatment in the SBR reactor, and a wastewater temperature sensor. The operation of submersible pumps is fully automated and is determined by many parameters, which provides automated control of the SBR reactor.

The batch reactor SBR is a self-contained independent unit designed for wastewater treatment at an average daily rate.

The reactor is equipped with aeration elements - aerators for fine bubble aeration, a submersible mixer, a submersible pump for pumping excess sludge, a device for decanting water, an analogous level sensor, an analog optical sensor of dissolved oxygen. Blowers are provided to saturate sewage with oxygen. The operation of the reactors is fully automated according to a special program pre-installed in production.

After SBR reactors, the biologically purified water enters the conditionally clean water tank from where it is pumped to the filters and then to the UV disinfection plants for additional treatment. Ultraviolet ensures the quality of purified water according to the SanPin requirements for the content of microorganisms.

Excess activated sludge with the help of submersible pumps is pumped out of the SBR reactor with each cleaning cycle into the storage tank and then to the sludge dehydrating unit. To improve the moisture-removing properties of sludge, a flocculant dosing station is provided. Dehydrated sludge with a moisture content of not more than 85% is accumulated in containers and taken out for disposal as necessary.

To reduce the concentration of phosphates in purified water to the norms of fishery ponds, a scheme for the chemical removal of phosphates has been adopted. For this, a coagulant dosing station is provided. Coagulant dosing occurs at the stage of aeration, directly into a working reactor.

Treated and disinfected sewage is discharged.

The wastewater treatment plant operates in automatic mode. The constant presence of maintenance personnel at the sewage treatment plant is not required.

It is necessary to involve 1 person (operator) per shift.

The station for biological treatment of domestic wastewater is designed and manufactured in compliance with applicable standards and rules, meets the requirements and rules of explosion and fire safety.

The equipment of treatment facilities is located in a building of container-block execution of full factory readiness.

Steel structures are designed from sheet and profile hire.

Blocks include technological equipment, process pipelines, shut-off and control valves and engineering support (instrumentation, heating, ventilation, electric lighting, security and fire alarms, telephone communications if necessary).

The enclosing designs of block containers- panels of "Sandwich" type. The insulation material is environmentally friendly, non-combustible.

The outer lining of the wall panels of the block containers is made of profiled steel sheet.

A single colour scheme is maintained for the entire building. The colour scheme is carried out according to the instructions of the Customer.

Window blocks are made of frost-resistant PVC profiles with tilt-and-turn fittings. Opening casements are equipped with mosquito nets.

External steel doors with non-combustible insulation. Doors are equipped with locks, gaskets and self-closing closers.

The interior decoration is factory-made. For the decoration of floors, walls and ceilings, materials approved by the bodies of the State Sanitary and Epidemiological Supervision are used.

Block containers can be installed both on a slab base and on a grillage of a pile foundation.

The technical solutions for heating and ventilation adopted for the building of the biological wastewater treatment plant comply with the environmental, sanitary, hygienic and fire safety standards in force in the Russian Federation.

Heating installation water or electric (according to the statement of work).

Supply and exhaust ventilation with natural and mechanical motivation is provided in the production premises. For the winter period in the supply unit, the outdoor air is heated to normalized temperatures. To maintain the necessary parameters of the air, automation of the supply system is provided, which controls the air temperature in the duct, the opening of the air valve during fan operation.

Primary extinguishing media are provided. A fire warning system is provided.

Electric lighting and power electrical equipment, as well as protective measures (automatic power off, grounding, grounding), comply with the requirements of current regulatory documents of the Russian Federation.

The electrical equipment of automation devices and instrumentation complies with the PUE according to GOST and Russian standards, taking into account temperature conditions, humidity, vibration, deviation of operating parameters from nominal, interference level, etc.

The equipment is provided with all the necessary tools for its tincture and diagnostics. Grounding of the equipment is performed according to the TN–S system. The applied instrumentation equipment uses standard 4-20 mA output signals for data transmission. The applied instrumentation equipment uses standard 4-20 mA output signals for data transmission. The equipment has sufficient vibration resistance (especially handheld inputs, storage media, etc.), corrosion resistance, extended temperature range, and frost resistance.

The following equipment is used to automate the process:

• PLC programmable logic controller and operator touch panels;
• decentralized peripheral facilities and control cabinets;
• control panels in the places necessary for conducting technological operations.

The automation system of technological processes (ACS TP) provides:

• collection and processing of data from peripherals and instrumentation;
• control, measurement, regulation of the parameters of the units;
• direct control of executive mechanisms;
• process visualization;
• process control and timely warning of deviations;
• data archiving in the form of trends and alarms, operator actions;
• regular work in off-line mode without connecting to the "upper" level of automation systems;
• exchange of information with the "upper" level of automation.

In case of emergency power failures, automation tools are provided with uninterruptible power systems for the normal and safe completion of production processes, data storage and restoration of operability after failures.

Local control panels have a degree of protection IP65 and have sufficient vibration and shock resistance, as well as the use of LOTO access restriction systems. Local consoles allow, in case of emergency, taking the full control in remote/manual mode.

The dimensions and weight of the blocks allow road or rail transportation. The supporting structures of the blocks have devices for slinging during loading and unloading, designed for transport loads.

To protect against corrosion, an external weatherproof coating is applied to technological equipment and pipelines.

The estimated lifetime of the installation is at least 30 years.

We are ready to develop an individual design of the Treatment Plant Station for your requirements, hold a consultation on the selection of equipment and place the designed Treatment Plant Station on the Customer's drawings.