Swiss engineering company ENCE GmbH together with its
The specialists of engineering company ENCE GmbH together with the leading European ecological institutes develop unique technologies of industrial wastewater treatment for needs of gas treatment plants and chemical enterprises to order. Units and complexes are developed to specific requirements of a customer. Units are equipped with the equipment of leading global manufacturers.
Utilized treatment technologies ensure discharge of treated water into the field ponds or its utilization in a closed loop of the enterprise.
Main utilized technologies:
The company develops its systems and plants based on the following methods (see below). The choice of the method depends on pollutants composition and type, their concentration in the waste water and local technological environment.
At the preliminary stage of waste water treatment, mechanical treatment of various kinds is used. Bulky sand wastes and other suspensions are removed during this stage. Mechanical purification is a preliminary stage that helps to prepare industrial and sewage wastes to further treatment. At this stage, various systems and modular plants can be offered depending on the requirements to further treatment.
Mostly widespread standard solutions:
The construction of the plant is chosen on the basis of wastes component analysis, required purification rate and customers’ requirements to the dimensions of the plant.
The offered technology is based on the emulsified product release from the waste water flow.
First of all, a coagulating agent is injected into the waste water that is being treated. As a result, emulsified substances that have previously been insoluble become precipitated. Once the flocculant is added, it enhances aggregation of the suspended particles and they break.
Coagulant and flocculant are added by means of specific instruments — coagulators and mixing chambers. These also carry out water treatment at the preliminary stages.
During the next treatment stage the flocculated precipitate is released by means of sedimentation, flotation or another separation technique.
The plant is completed with a specific type of flotation machine depending on the sediment characteristics.
Plants can be completed with the following types of flotation machines according to technical requirements:
Flotation machines are additionally completed with metering pumps, feed stations, mixing stations and machine monitoring systems.
One of the major processes that allow extracting
Flotation process consists in the extraction of foam precipitation to the water surface and its further collection. The precipitation is generated after the purification.
During preparation prior to the flotator treatment, water is being mixed with coagulants and flocculants. After that it enters the lower part of the machine and goes under the sparge tube.
As a result of this collision of the flows, air bubbles cling to flocculent sediment that is being released at coagulation/mixing chambers and extract the sediment to the surface. It is removed from the surface by means of movable cleaning scraper and placed into a storage hopper. Flotation is considered to be one of the most effective methods for the extraction of
Our company offers various assemblies of induced air flotation plants:
If the flotation is complicated due to the considerable heavy particles content, additional subsidence is used. If the Customer needs water purification rates to be even higher, a plant that combines sediment flotation and purified water filtration can be used. This plant consists of a coagulation chamber, flotator and a
Intermittent filter flushing is implemented
So that to meet more demanding requirements to water treatment standards, mineral coagulants and flocculants can be used on all plants. Flotation plants can also include pumps for flow supply to the plant, air treatment stations, etc. Both standard control panels and individually designed ones (in compliance with requirements’ specification) industrial control systems are optional.
Aeration tanks are the most widespread industrial solutions for sewage water treatment at the industrial treatment plants that use traditional biological treatment. These tanks require much space, additional disinfection (ultraviolet treatment, chlorination) and generate offensive odors. Besides, the quality of the treatment is changed because of sewage water input parameters’ fluctuations.
Treatment solutions on the basis of membrane technologies offered by our experts allow reducing building costs up to 70%, whereas the quality of treatment gets much better. Bacteria and almost all the viruses are removed. The purified water meets German requirements to swimming pool water quality.
Membrane ultrafiltration plants help to solve the problems of traditional sedimentation tanks with substances floating on the water surface as well as problems with the removal of sedimentation buildup.
Existing primary and secondary settling tanks can be converted into buffer tanks.
Membrane bioreactor is a composition technological process that combines biological stages of sewage water treatment with membrane filtration. The technology integrally consists of 2 purification stages:
Once the pollutants are removed by means of mechanical filtration, sewage water enters a bioreactor for biological treatment. It is carried out via a series of
Membrane bioreactor is a unique
Environmental needs and increasing environmental concern may raise the application of UV sterilizing systems at sewage treatment plants up to 70% in comparison to chlorination (in the domestic market). It may happen due to the fact that UV treatment does not generate disinfection byproducts. Nowadays UV treatment is used on all kinds of sewage treatment plants, from small automatic country ones to the large ones. UV treatment application also became more diverse which means that it was generally approved as an effective and saving way of sewage treatment.
Intensive UV light approaches microorganisms in the water and influences their DNA directly. Once DNA is deactivated, cell division stops. Destruction of more than 99% of pathogenic germs is possible.
UV system has more effective performance characteristics than traditional chlorination. Chlorination requires 15–30 minutes for the appropriate performance, while UV treatment requires just several seconds on the discharge line which means that the single flow price from UV is very low.
Due to the fact that plants do not always have an opportunity to remove the piling up waste from wastewater treatment facility to a waste burial site, we can optionally complete sewage water treatment unit with a sludge dewatering unit. It will carry out a finishing stage of waste water treatment and allow future sludge utilization. Our company can develop, complete and deliver dewatering, drying and combustion plants for sludge processing. This technology allows receiving end product with less than 10% dampness at the output.
Sludge processing consists of three stages:
On the first stage, a division between liquid and solid phases and preliminary dewatering occur. Dewatering is carried out on the pressure filters (screw or belt).
Final dewatering and drying take place during the second stage. The residual moisture is being removed in the special chambers at relatively low temperatures. Output moisture percentage varies from 30 to 8%. Various types of gas, steam and even hot water can be used as
During the third stage, dried and dewatered product is being formed into the granulated material. It is
The granulated material received can be processed or burnt in order to generate electricity.
Depending on the customer’s requirements we can offer closed cycle of waste water treatment and sludge processing with almost zero emissions.