• More and more often where you can earn money by cleaning the city water appear on business ideas portals. All you need for it is a floating excavator, barge loading bottom debris and scuba gear in case you have to dive.

  • Legendary Lake Ülemiste in the vicinity of Tallinn was sung in the epic «Kalevala». Cleansing with a screw technology allows not only to combine worsk and water intake for the needs of the city, but does not harm the rest of the citizens in the swimming season

  • Building debris is the problem of reservoirs located near new buildings. While cleaning of the Dolgoe lake in St. Petersburg, Russia 1800 submerged objects were raised. There were even pieces of metal and concrete structures. In addition, the field around the lake was almost destroyed had to be restored.

  • These inconspicuous-looking tablets or pellets have poetic name «sapropel». A substance extracted from the bottom sludge layer which in urban reservoirs is often much thicker than the layer of water. Sapropel is successfully used as fertilizer in the fields. And you can never remove it from the city as it iss used as a therapeutic mud

  • Jeffrey Witt is an artist with a saw in his hand.He creates works of art from the wood lifted from the ocean bottom. By the way such wood which has been laying at the bottom for the years, and even decades, is especiallly strong and durable

  • Grafsky pond in St.Petersburg is to be cleaned using Chlorella, a microscopic green algae. After it destoys all harmful bacteria, the service staff should only catch water lilies and duckweed from a pond

  • Eichhorn or «water hyacinth» is green fighter with oil and heavy metals. It successfully absorbs not only oil, but also phenols, insecticides, mercury compounds, lead and cadmium, which plays a huge role in urban areas

  • Canadian waterweed is loved mainly by domestic breeders. However, a few people know about its unique antiradiation superpowers. Moscow scientists, exploring the pond, where it grows, found in its roots strontium, cesium and radium decay products, whereas there were no trace of them in the water or sediment

  • Marinobacter similis is a type of bacteria discovered by scientists in the Pacific Ocean. These tiny organisms are the one who can destroy detergents. Wastewater often get into urban waterways, where this ability is very helpful

  • This is how a city pond looks like before and after biological cleaning. In just 5 weeks a coliny which contains from 6 to 12 species of bacteria that perform different tasks, will turn brownish-green muck urban pond in clean water. No algae, no slime or mud

Urban Water Ponds Treatment: Which is Better - Bacterium or Excavator?

Of course, looking at the brown-green slime covered by rainbow sheen, we all understand that ponds, lakes and rivers located in the city need to be cleaned. But is it worth doing it in «old-fashioned» way scooping slimy mud from the bottom by excavators, and in some places even draining the entire body of water? Shouldn’t we try to pay attention to the experience of European cities and the latest scientific developments in a century of nano- and biotechnologies? We’ll try to understand.

Mechanical method: fantastic technique

Recently the market in the big cities have got the opportunity to «order» a professional team that can clean a small pond in a few days. There a few people in the team of divers, who have barge for loading garbage and special equipment on pontoons to get the garbage from the bottom. Such a technique may be some sort of an excavator, but there are more modern devices. For example, screw technology which was used in cleaning three Estonian lake - Maardu, Harku and Ülemiste. Imagine a giant meat grinder but vice versa. That's exactly how a screw method works. The machine gets mud and silt from the bottom of the pond, ships it to barge and takes away to dry. Such treatment technology does not prevent water intake for urban use. In addition, summer vacation of the citizens will not be spoilt even if the machine is working in a few dozen meters from the beach. Well, what to do with all the dirt and mud extracted from the pond? The answer is poetic - «sapropel». These specially dried and cleaned sediment fertilize the fields or even transform the deserts into fertile oases. A part of sapropel and can be left in the city, benefiting the local beauties. In fact, many spas have appreciated it as a therapeutic mud.

Biological method: small but efficient

Why spend so much efforts and time to do the job when our smaller brothers can make it more effectively? Biological treatment of urban water body with the help of plants or microorganisms is often much more efficient than digging dirt. To see this, you do not need to go far. The Grafsky pond located in St. Petersburg, Russia has recently become a platform for an unusual experiment. The city authorities decided to clean up an impossibly overgrown and muddy pond with the help of microorganisms. Colony of unicellular green algae Chlorella will be launched into the pond, where they begin the hunt for harmful bacteria, polluting the water. And after the pond is clear, just water lilies and duckweed will be left to remove from the pond. By the way, the algae can fight not only for water clarity, but also for its cleanliness. Eichhorn, also called "water hyacinth", successfully removes oil products, phenols, insecticides and heavy metals from the pond. Waterweed has also these «superpowers» and is capable to absorb radioactive substances. And recently an unusual type of bacteria «Marinobacter similis» was discovered by scientists in the Pacific Ocean. These small bacteria, as it turned out, eat detergents, substances that make up the majority of washing fluids and are a real headache for environmentalists. But the technology of cleaning water using «biopowder» can be called a miracle. Remember the popular juices in 90th «Just Add Water»? Here is the same, but instead of sugar and flavorings a bag contains corn flour, which is a breeding ground for several (6 to 12) species of bacteria that perform different tasks from the destruction of sludge to the oxygenation. According to the manufacturer, this «force» will clean up any pond or lake in average 5 weeks.

P.S. In St. Petersburg over 150 closed reservoirs and ponds with an area of 0.1 hectares are registered. And actually it does not matter, who clean them: people, algae and microorganisms. The main thing that if we want to be closer to the elements from which we once came, the thing we should see in front of us not a stagnant puddle, but a clean and clear water.

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