How to choose a pump for pumping sewage

In various types of economic activity, situations often arise when it is necessary to pump out contaminated liquid. Choosing pumping equipment for these purposes, one has to take into account the increased erosion effect on him of mechanical inclusions and the likely change in the acidity of the medium under the influence of substances dissolved in water. There are units specially designed for operation in such difficult conditions. Fecal pumps are a separate class of similar devices used for pumping sewers.

Appointment and features of the fecal pump

A sewage pump is needed for a cesspool or for a septic tank: it is periodically put into operation when pumping wastewater is required for emptying or cleaning the collection of household waste. It can be completely immersed in the pumped liquid or installed in the immediate vicinity of the toilet pit. The design and parameters of such units are specifically calculated on the ability to transfer heterogeneous mixtures.

Sometimes inexperienced users do not see the difference between domestic sewage pumps, designed for sewage in a private house, and drainage pumps, used for pumping dirty water. Their device is largely similar. For both types of equipment for protection against mechanical damage, there are grids on the inlet pipes and large gaps between the rotating impeller and the housing, which prevents clogging and jamming of parts.

Sometimes in case of urgent need you can try to replace the unit of one type with another, but it’s better use strictly according to purpose. Distinctive features of fecal pumps are:

• the ability to pump liquids with solids up to 35-50 mm in size, when for drainage devices this parameter is usually 5-12 mm;
• the use of more powerful electric motors, which is associated with increased viscosity characteristic of wastewater;
• equipment with a receiving device with a mechanical grinder in the form of rotating knives.

Types of fecal pumps

In the manufacture of pumping equipment intended for pumping highly polluted water, apply durable and chemically inert materials:

• high-quality steel grades, including stainless;
• cast iron;
• special types of plastic.

The absolute majority of wastewater pumps are of a centrifugal design with an electric motor and pumping unit assembled in a single unit. They are usually located coaxially and placed in a common building. By type of installation, the models are divided into:

• submersible;
• semi-submersible;
• superficial.

When planning to purchase a pump for faecal sewage, you should know the features of its design and method of use.

Submersible pump

Such a device is located under a layer of liquid at the bottom of the tank. It has a sealed enclosure that reliably protects the engine from water ingress. Manufacturers usually equip such pumps with a grinder.

The design of the receiving unit eliminates the tight fit of the unit on the sand or silt, which ensures reliable operation. It can be installed permanently, providing reliable fastening to the supporting structures, connecting the exhaust hose for the fecal pump and the electric cable.

With periodic use is convenient mobile way to install a submersible pump. At the right moment, it is lowered into the reservoir on a chain or cable with the discharge hose already connected. So usually gardeners and owners of country houses intended for seasonal rest do. In this case, the process of cleaning and repairing equipment, which can be taken away for storage in winter, is simplified.

Submersible units are equipped with automatic start and shutdown. Commands to the engine are delivered by a float moving along with the level of the liquid.

Semi-submersible pump

A distinctive feature of the design of such units for discharging liquid waste is extended shaftconnecting the impeller with the engine. This allows pumping without dropping the motor into the water.

Such pumps are conveniently mounted in a vertical position on a floating platform or mounted on the inner wall of the tank. In the latter case, an automatic sensor for monitoring the level of the liquid will be required, giving a command to start when water approaches the engine. Small models can be designed for periodic use. At the same time they are manually hung at the edge of the tank.

Surface pump

Drainage and faecal pumps of surface type installed at ground level or mounted outside the tank. Only the receiving tube or hose is lowered inside. Such models are designed for a specific suction height and are not able to take liquid from a great depth. They are very sensitive to heterogeneous mixtures and may fail in such conditions. But their design is simple, which allows to produce very inexpensive products.

What to look for when choosing a fecal pump

Any pump is purchased for specific purposes. Before buying equipment you should know for sure:

• the estimated intensity of its use associated with the mode of flow of waste;
• the depth of the tank, the height and distance of the pumping fluid;
• diameter of pipelines used;
• size and nature of solid inclusions.

When choosing a model you like, it is recommended to study it. specifications:

• nominal flow rate;
• suction depth;
• maximum pressure;
• temperature range of the pumped liquid;
• power consumption.

The equipment will wear out over time, voltage fluctuations are possible in the electrical network, working conditions may change, therefore it is better to purchase a pump with some margin. It is useful to find out from the seller information about the intended method of fastening the unit, connecting hoses or pipelines and other design features. In some cases, you may need at the reception not only a protective grid with a specific cell size, but also a shredder.

Do not neglect the possibility of using automatic controls: they slightly increase the cost of the product, but can save it from damage.

There are situations when, when equipping a bathroom in the basement, it is below the level of a septic tank or sewer. In such cases, apply special forced pumping pumps for the toilet or for the kitchen, immediately included in the work upon receipt of fluid.

Brand of pumps, deservedly popular with the owners of individual houses

In order not to face serious problems during the operation of the fecal pump, one should give preference to products of well-known manufacturers when buying. Presented here is a small rating of the most reliable and easy-to-maintain units designed to help choose the right model without the risk of making a mistake.

Dzhileks Fekalnik 255/11 N

A simple and reliable submersible pump of the domestic brand with a capacity of 255 l / min with a pressure of 11 meters and a power consumption of 1100 watts. It has durable stainless steel case and is equipped with an automatic float switch.It can be immersed in water to a depth of 8 meters.

Gilex weighs 7.6 kg. It has a convenient carrying handle and a universal nozzle for connecting hoses of various diameters. It stably pumps liquid with solid inclusions with a diameter of up to 35 mm. Knife chopper is not provided. Great budget model for permanent use.

Caliber NPC-1350 NF

Another inexpensive Chinese-made pump, pumping up to 300 l / min of fecal matter. It can dive to a depth of 5 meters and create a pressure of 12 meters. The main body parts are made cast iron and stainless steel. Unit weight 24 kg.

The product is equipped with a reliable 1350 W electric motor, float switch and chopping knife. It has a universal hose nozzle for different sizes and a stable support in the form of a tripod.

Sturm WP9709SW

The best reviews deserve a German-made fecal pump with a capacity of 233 l / min and an engine power of 900 W. It weighs 17.8 kg, as the rugged casing is made of cast iron and stainless steel. It is lowered to a depth of 5 meters. It creates an overpressure of 1.2 atmospheres.

This model has a float switch and a chopping knife.The allowable size of solids in water is 36 mm. Pump is different simplicity of operation and long service life.