|Пречиствателни съоръжения за отпадни води
Повишаване на изискванията към предприятията изпускащи в околната среда замърсени води, вследствие на производствата си в много случаи води до изграждане на нови пречиствателни съоръжения ,отговарящи на съвременните изисквания,работещи ефективно и достигащи параметри не обременяващи околната среда. МАМЕЛ ООД в сътрудничество с фирми от ЕС и SEG –Израел може да предложи пречиствателни инсталации за отпадни води в различни области на индустрията: Селско стопанство-свинеферми,птицеферми,говедоферми;хр.вкусовата индустрия-мандри,месокомбинати,птицекланници , маслодобивни предприятия и др.;предприятия за производство на хартия,фармацевтични и козметични предприятия и др. При проявен интерес от стран ан заинтересовани компании,наши специалисти ще посетят обекта и ще се запознаят с проблемите ,за да предложат ефективно решение.
Пречиствателни съоръжения за отпадни води
Примерни инсталации :
Wastewater Treatment Plant
Paper mill– 720 m3/day
Capacity - 720 m3/d
We understand the specific problems associated with this kind of manufacturing, due to our experience and cooperation with this sector. Along the years we have supplied numerous solutions to this sector. Typical problems are;
High SS loads, variability of pH, sometimes sticky fillers which tends to adhere to surfaces. Our GreenFloat technology was especially mobilized to meet and solve those problems. Wastewater specifications, as received by the customer, mgl. Capacity – 720 m3 / d
COD - 1830
BOD - 800
TSS - 940
PH - 7.7
1. Solution Description.
Compact plant designed to meet the most stringent pollution standard Continuous & automatic floor mounted, the sludge can be further dried by a Belt or Plate press.
In order to comply with the European norms for effluent discharge into natural water bodies it is required to achieve very high purification degree, which only possible to achieve by two treatment stages.
Modules I; Chemical/physical, to removes all particulate loads and Oils and Greases.
Module II; Aerobic biological degradation of the soluble organics and nitrogen. 2. Process diagram.
2.1 Stage 1. screening and Storage.
Raw untreated wastewaters are collected within the plant and flow through a coarse screening device (a rotating drum could be used) of about 1mm slot width into a common buffer storage tank of a volume of few hours of operation, we recommend a minimum volume of one day of operation- approx 700 m3.
The buffer tank must be mixed during the GreenFloat operation.
This storage tank is equipped with adequate overflow, ladder, level control, mixing, etc. 2.2 Clarification with counter current Air Flotation (COCUF), Module I. Our unique COCUF System works on the counter current principle. This principle ensures excellent solids separation in an easily controllable process.
The main components are the circular stainless steel vessels, divided into two zones: flocculation and separation, its geometry design ensures premium solids separation and sludge thickening. The aeration and hydraulic circuit is very simple employed full aeration principle (or recycled system, where only about 30% of the flow is mixed with air, the final selection will be made during the design phase) fine bubbles production is controlled by the diaphragm expansion valve, that also ensure constant expansion pressure at variable flow operation.
The thickened sludge is accumulated at the COCUF top section and skimmed of by the rotating scraper.
Sludge level control.
Level control of the floated sludge at the top section of the COCUF, is essential to achieve good sludge consistency. SEG developed a unique technique that employs very little hardware and software enabling a premium sludge layer control together with variable plant flow feature.
2.3 Sludge Dewatering.
Sludge treatment is an essential stage in any wastewater treatment solution. It is essential to de water the sludge, before land filling, otherwise the volume and the weight will be too high.
For this application we selected the Belt Press technology, since it is a continuous operation, at low energy consumption, also the price is moderate.
The sludge dryness could reach about 25% DS.
Alternatively a Filter Press (F.P.) can be used, yields about 35% DS.
Surplus sludge from the biological process will be directly diverted into the GF pump, and will thicken and de water with the GF solids.
2.4 Aerobic biological treatment, Module II.
Activated sludge is a process in sewage treatment in which air or oxygen is forced into sewage liquor to develop a biological floc which reduces the organic content of the sewage. In all activated sludge plants, once the sewage has received sufficient treatment, excess mixed liquor is discharged into settling tanks and the supernatant is run off to undergo further treatment before discharge. Part of the settled material, the sludge, is returned to the head of the aeration system to re-seed the new sewage entering the tank. This fraction of the floc is called R.A.S - Return Activated Sludge. The remaining sludge, also called W.A.S - Waste Activated Sludge, is further treated prior to disposal.
Sewage liquor is run into deep tanks with diffuser blocks attached to the floor. These are like the diffuser blocks used in tropical fish tanks but on a much larger scale. Air is pumped through the blocks and the curtain of bubbles formed both oxygenates the liquor and also provide the necessary stirring action. Where capacity is limited or the sewage is unusually strong or difficult to treat, oxygen may be used instead of air.
The selection of the bilogical process, probably extended aeration in a conventional aeration and calrifier or SBR, will be made during the design phase.
3. Control & power system. The GreenFloat is a fully PLC controlled system, all actuator and accessories are wired to the main power & control cabinet.
Designed plant capacity- 30 m3/hr, at TSS of 1000 mgl
Outlet module I
COD reduction - < approx. 50% to 900 mgl
BOD5 reduction - < approx. 50% to 400 mgl
FOG - <10 mgl
TSS-< 50 mgl Sludge-20 -30% DS, depend on de watering hardware
used pH - 7-8
Outlet module II, biological
BOD - < 25 mgl COD - < 250 mgl TSS- < 50 mgl
- 6-9.7 Generals.
Storage tank Capacity - 700 cum, recommended
Power with belt press - 15 Kw
Floor area - Approx. 10 X6 m, with FP, without inlet storage tank Max height - 4 m (can be changed on request)
Mounting weight-Approx. 3 ton
Module II BOD to be removed - 270 kg / day
Aeration - 20 kW
Total power - 30 kW
Aeration tank - 600 -1000 m3 – 20X7.5 X 4 m deep
Secondary Clarifier - diameter 6 m, height – approx. 3 m
Coagulant - to be defined - Organic 200 – 1000 ppm
Flocculent -Liquid polyelectrolyte 10 - 20 ppm
Acid / Bas -To be defined
Electricity- 50 kW continuous, including aeration
Pressure-6 Bar minimum, 8 bar maximum
Consumption -Approx. 100 Lit \ min STP Water, fresh. Pressure -3 bar minimum Consumption -100-200 Lit \ hr Environment condition. Indoor or outdoor Temp. - 1C – 45 C For sub zero temp, Consult SEG
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