A chemical-physical wastewater treatment plant<\/a> for the treatment of industrial wastewater is generally located downstream of production. In these cases, it can therefore be useful to commission an external audit of the wastewater system in order to obtain clarity about the current situation and, if necessary, to be able to take immediate action. Example of a wastewater treatment plant audit (extract): The wastewater system (continuous flow system) is now 40 years old and consists of several steel components and various plastic tanks. <\/em>As there is UV radiation in the room, the PP plastic tanks + PVC piping should be replaced due to material fatigue caused by embrittlement and also the control system due to age\/no longer state of the art. <\/em><\/p>\n The average wastewater volume is 35 m\u00b3\/day, but on peak days up to 100 m\u00b3\/day (= 4.1 m\u00b3\/h max. The design parameters for a continuous flow system of this type are as follows:<\/em><\/p>\n The “2 m\u00b3 treatment tank” only has a volume of 1.6 m\u00b3 due to installations and agitator and is therefore too small and should be enlarged to an actual 2 m\u00b3, preferably 4 m\u00b3, in a new design. The two storage tanks for the waste water are each 15 m\u00b3 in size. Typically, the authorities require the separation of acidic and alkaline wastewater for mutual neutralization as a chemical-saving measure. The “preparation stations” for other chemicals (FeCl3<\/sub> (liquid delivery) + Zetag 8180 flocculant (delivery form: solid)) are showing considerable signs of wear and should be replaced. Note: It used to be possible to use simple PP containers without approval if they only had a single approval. The lamella separator is made of steel and can and should be retained. The small 100-liter chemical dosing tanks on the treatment tank should be omitted anyway, but they would be permissible. <\/em><\/p>\n The multi-layer filter is a PE-GRP container, which could also be designed as a steel filter with a PA inner coating. A selective exchanger is not currently available, but can be provided by the authorities if necessary. Please contact<\/a> us if you have any questions<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" Audit of wastewater system (industrial, chemical-physical wastewater system) A chemical-physical wastewater treatment plant for the treatment of industrial wastewater is generally located downstream of production. Its purpose is to ensure that the regulatory requirements are always met when the treated process water is discharged as wastewater. The production substances contained there, e.g. acids and alkalis, […]<\/p>\n","protected":false},"author":1,"featured_media":3912,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"greyd_block_editor_preview":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3919","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nicht-kategorisiert"],"_links":{"self":[{"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/posts\/3919","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/comments?post=3919"}],"version-history":[{"count":1,"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/posts\/3919\/revisions"}],"predecessor-version":[{"id":5581,"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/posts\/3919\/revisions\/5581"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/media\/3912"}],"wp:attachment":[{"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/media?parent=3919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/categories?post=3919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/decker-vt.de\/en\/wp-json\/wp\/v2\/tags?post=3919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nIts purpose is to ensure that the regulatory requirements<\/a> are always met when the treated process water is discharged as wastewater.
\nThe production substances contained there, e.g. acids and alkalis, but also dissolved substances from the production material itself are contained in the wastewater and must be neutralized or removed.
\nThis wastewater treatment process generally worked well at the time of the initial design or commissioning; an audit of the wastewater system clarifies whether this is still the case.
\nOver the years, however, there are many unavoidable factors that can change the functionality of a chemical-physical wastewater treatment plant<\/a>.
\nThese include, for example<\/p>\n\n
\nDepending on the individual case, this can be clarified as part of the wastewater system audit:<\/p>\n\n
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\nwith 4-shift operation. <\/em><\/p>\n\n
\nAny monitoring values that are exceeded are mainly due to the insufficient contact time. <\/em><\/p>\n
\nExperience has shown that there is not particularly good mixing in the tanks, i.e. there are always strongly acidic and strongly alkaline components, so an agitator would be an advantage.
\nThis would homogenize the pH value in advance and reduce the load on the actual treatment tank.
\nThe disadvantage, however, would be that precipitation may already occur.
\nHowever, this could be utilized with an inclined bottom for complete emptying or at least for hydroxide discharge.
\nHowever, a diaphragm pump would then be required for transportation, as the existing centrifugal pumps would quickly become clogged. <\/em><\/p>\n
\nHowever, as the alkaline wastewater is reported to be very low and only occurs occasionally, this can be dispensed with for this reason. <\/em><\/p>\n
\nThe AwSV-compliant design must be observed, as these are AwSV storage tanks: for Zetag 8180 a PP preparation tank with sloping bottom as before, which is completely transferred to a new PE storage tank with trough and DiBt approval.
\nThe FeCl3 tank would also have to be designed as a PE storage tank with sump and DiBt approval, refueling as before from the WHG sump with the chemical pump.
\nThe sump on the FeCl3<\/sub> tank is also too small, \u00a7 18 Para.
\n1, 3 No. 1 AwSV. <\/em><\/p>\n
\nIn new plants, however, these options are no longer regularly approved by the AwSV experts; instead, AwSV-compliant storage containers are required as described above.
\nExceptions are genuine dosing tanks, i.e. if the entire contents of the tank are emptied in one shift \/ 24 hours.
\nIt is also possible that these had an earlier VaWS SV individual approval, but nothing is noted on the containers and no other documentation is available. <\/em><\/p>\n
\nThe chamber filter press is still an open chamber filter press and could either be designed as a closed one (no splashing, no more odor formation, acid rinsing of the plates inside the press possible) or as a closed one with automatic emptying.
\nThe use of an FU pump would make sense here and would fulfill the requirements of \u00a7 3 Para.
\n2a AbwV. <\/em><\/p>\n
\nThe background to this is that a layer of hydroanthracite would also have to be filled into the filter, which would have to be refilled again and again because it can be rinsed out very easily.
\nHowever, the container has to be opened frequently to do this.
\nHowever, this is difficult to do with the PE-GfK containers because the thread wears out quickly.
\nFor the feed pump of the multi-layer filter, a frequency converter pump would also make sense in order to fulfill the requirements of \u00a7 3 Para.
\n2a AbwV. <\/em><\/p>\n
\nHowever, there are chemical parameters that contradict this: the wastewater contains manganese, which oxidizes to manganese IV (manganese dioxide) in an already slightly neutral-alkaline (from pH 6.5).
\nThis forms chlorine gas with HCl during the regeneration of the selective exchanger.
\nThe selective exchanger would therefore be inadmissible for health and safety reasons. <\/em><\/p>\n