BIO Water Recycling

German Patent

Description of the Process

BIO Water is a system combining the treatment of recycled water and process water especially designed to meet high demands of the process water quality for running car wash plants, repair work facilities and high pressure devices. It further enables the simultaneous treatment of otherwise „critical“ waste water, e.g. from washing motors of from the workshop area. 
1. Fresh water requirement The use of fresh water within a car wash plant constitues a major cost factor which due to the steady rise of fresh water and waste water rates will continue to increase during the years to come. In connection with the BIO Water Systems the wast water flow from the wash hall is treated and made available as process water for the actual car wash. The wash components with the highest water consumption such as brush wash and foam application are carried out by recycled water. Fresh water is only required for the rinsing and wax finish stages. The BIO Water Systems ensure a recycled water volume of at least 80 % and completely odour-free process water, provided that biologically sound cleaning agents are used in standard wash process. 
2. Waste water The majority of vehicle wash plants are indirect polluters, i.e. waste water is discharged into the public sewage disposal plant. The maximum pollutant values for waste water produced fall under the jurisdiction of the local waste water bylaws. The permissible maximum values as specified by the waste water legislation may therefore sometimes differ from the minimum requirements laid down in the waste water administration regulations (VwV-annex 49) and in the technical wast water association (AVT A 115). The BIO Water guarantees that the values for waste water dicharged into the canalization remain well under the legally permissible maximum values. The BIO Water Systems are a truly long-term investment and will meet even more stringent environmental regulations in the years to come. 3. Specifications of the water processing The BIO Water Recycling Systems as described below are designed individually for each project and are brought into line with the required process water volume.

Max. process water volume :
BIO Portal : 2.5 cbm / h
BIO Classic 35 : 3.5 cbm / h
BIO Classic 55 : 5.5 cbm / h
BIO Classic 150: 15.0 cbm / h

The waste water from the washing area of the wash plant, high pressure devices as well as from ball valves in the workshop is fed into the biological sludge trap (min. of 2 x 5 cbm). By means of a submersible pump the required process water is fed from the second sludge trap into the top level „activation tank“ and flows back into the first sludge trap via the overflow. Specially adapted microorganisms are added to the whole recirculating system to further improve the process water quality by the biological decomposition of possibly existing carbon hydrates and tensides. The solid components of the crude waste water from the second sludge trap are separated in the „activation unit“ by means of a special sieve with conical gaps and are collected in a filter hose with removable filter cartridge. The filter is drained into the first sludge trap. The waste water to be biologically purified in the BIO Water sludge process is highly oxygenated and dirt particles are floated off with a clear water zone rich in oxygene being achieved in the BIO Water. An installed fluidized bed serves to enlarge the settlement area of microorganisms thus increasing the biological decomposition of pollutants. Clean process water is drawn off from the clear water zone by means of pressure pump and fed into the process water storage tank via a subsequent filter device (separation grade 80 ym). The filter capacity is permanently monitored and the SPC display indicates if the washable filter cartridge has to be replaced. The clean process water for high-pressure pre-cleaning, underbody wash, foam application and brush wash in the car wash plant and/or for pre-cleaning and brush wash in the self-service wash facilities can be taken from the process water storage tank whereas for rinsing and wax application fresh water is required. If no process water is withdrawn, the basin is periodically emptied and the water is fed into the sludge trap. In case of process water shortage a solenoid valve automatically controls the feeding of fresh water into the basin. The volume of recycled process water achieved in the wash area is mainly determined by the combination of wash programmes. A recycling rate of process water of up to 80 % has been achieved in similar applications. According to the legal regulations a fuel separator has to be installed to prevent any oil or fuel accidents. Local waste water bylaws may even prescribe the in-line installation of a coalescence separator. As a rule subsequent adjustments can be carried out without additional digging work provided that empty pipes run from the pile basin to the installation site of the plant for the recycling of process water. There are two alternatives for the underground layout of the tanks: Two subsequently installed sludge receiver and a fuel/ coalescence separator or sludge receiver - fuel/coalescence separator - pile basin. Option: Stationary sludge removal The sludge removal system, available as option, consists of an additional mixer-pump and a submersible pump which are installed in the first activated sludge tank where most of the sludge is accumulated. The sludge is removed at night. The accumulated sediments are whirled up by the mixer-pump and pumped to the activated sludge tank of the BIO Water. The sediments in the activated sludge tank are separated from the crude waster water by means of a special sieve with conical gaps and fed into a filter system. Here, the sludge is drained via a compressed air membrane pump into a filter hose with the filtrate being fed back into the first sludge trap. The sediments from the sludge trap are compacted in the filter cartridges and are regularly dicharged in mobile tanks by a specialized sludge disposal company.

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This page has been created by MTK 2020 ,Last Update: 26. Mar 2016