Portable Waste Water Treatment

Portable Container WWTP - SBR

Portable Waste Water Treatment Plant
Portable WWTP - SBR Information Document
WWTP meets all requirements

Fully portable and containerised this Waste Water Treatment Plant (WWTP) is transportable between site locations by means of standard container carrying road transport, and installation requires the minimum of ground works as the WWTP sits on a simple concrete base.

This Waste Water Treatment Plant is operational in a variety of climatic conditions, including tropical, arid and subarctic climatic zone and without the creation of odour or aerosols

The unit employs a highly efficient method for organic substances removal, including amoniac nitrogen removal from waste water. Add to this the high flexibility of WWTP operation with:

  • Unequal hydraulic and substance loading
  • Long service life of WWTP technology
  • Low energy demands

All with highly automated operation and minimal requirements of service staff.

Capacity of proposed WWTP and outlet parameters:

With demands to remove suspended solids and organic pollution from waste water the WWTP capacity is 250 PE with each reactor running 3-4 cycles per day.

In the case that there is a demand to remove ammonia and nitrogen the capacity is up to 170 PE. with each reactor running 2-2.5 cycles per day.

The WWTP plant is operational with the load of 50% of the proposed values. In case one line is stopped, the plant may be operated even with the load of 25%. With these parameters, the treated water quality at the outlet from the plant is guaranteed.

The WWTP will achieve the following outlet parameters within the following conditions:

- The waste water stream will not contain significant sources of industrial waste water

- waste water will be delivered to the WWTP with separated sewerage

- acceptable ballast water quantity up to 20% of Q24

- Inlet temperature of waste water to WWTP will not be lower than 8°C

Containerised WWTP is installed inside of 4 steel containers with standard dimensions for transporation purposes. The first container incldes a mechanical pretreatment unit, water divider, blower, aggregates and electrical control switchboard with control system. Second and Third containers serve as biological reactors. The final fourth container is utalized as the sludge storage tank.

Coarse Pre-treatment

Rought impurities from the incomming waste stream are captured for removal on circular bar screens -„Bug“

that are equipped with emergency overflow. Screened debris is transfered to a collection bin for disposal by gravity. Mechanically pretreated waste water is flows into water divider.

Water divider tank

The Water divider tank is an enclosed 2.0 meter dia. 1.5 metre high self-standing cylindrical polypropylene tank . This divider tank is fitted with two submersible pumps. These pumps control the pumping of the pretreated waste stream into either the first or second biological reactor (each pump for one reactor) . Its run or stop is time controlled or in accordance with reactor water levels.

Biologic reactors SBR

To ensure maximum flexibility The WWTP uses two SBR reactors running in parellel. Each biological reactor is housed within it’s own container. The Waste water inlet into each reactor is intermittent and controlled automatically.

The pumping and draining time of waste water from each reactor is selected so that treated water is discharged from both reactors concurrently. The treatment cycle of each reactor consists of following phases:

  • Sludge regeneration
    – after treating water, the discharge is intermittently aerated dependant on substance balance of the system. After the elapse of the set time the reactor antomatically starts the next treatment phase.
  • Activation
    – Mechanically screened pretreated waste water is pumped from into the reactor water divider. During filling the reactor contents are intermittently aerated to produce (nitrification and denitrification). The operational time of the aeration blower is adjustable through the control system in accordance with the actual WWTP loading. This step is finalised when set water level are reached or by lapse of set time.
  • Post aeration
    – The reactor contents are intermittently aerated without the simultaneous inlet of mechanical pretreated waste water. After the completion of the set operational time the reactors move to the next treatment stage (phase).
  • Sedimentation
    – After aeration sludge sedimentation occurs, After the completion of the set operational time the reactors move to the next treatment stage (phase).
  • Excess sludge and treated water withdrawal
    – sedimented biologically treated waste water from both reactors is automatically pumped to discharge means of the inbuilt pumps. A decantation unit withdraws waste water on the set minimal water level. After the completed run of a set number of cycles, sludge is automaticaly pumped from the system by means of a pump installed at the bottom of reactor into the excess sludge tank until the set water level is achieved.

On completion of the treatment process, the reactors automatically revert to the first treatment phase. And the process is repeated.

Whilst the first reactor is going through the phases of sludge regeneration, post aeration, sedimentation, excess sludge and treated water discharge the waste stream is automatically diverted to the second reactor creating a seamless treatment process with no down time.

Aerobic sludge stabilization – sludge tank

A seperate sludge tank is located within it’s own container and connected to both SBR reactors. This sludge tank provides anaerobic sludge stabilization of the excess activated sludge and for its partial gravitational thickening.

Before each sludge discharge the aeration in the sludge tank is automatically halted (for approximately 3 - 4 hours). to allow the sludge to sediment and thicken

Excess sludge is automatically pumped from each reactor SBR with the sludge water outflow through a discharge pipeline into pumping tank.

The aerobic storage of sludge will assure a totally smell-free operation of the waste water treatment plant. The stored and thickened sludge (approximately 1 – 1.5%) will be taken away for disposal through the use of a gulley sucker or agricultural slurry tanker.

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