Case study     MunicipalWastewater
Start Up          May2016
Capacity         20000m3/d
Location         Iran

Challenge

This is the first large water reuse project in Iran, the first project which use the waste water as steel production water source, the whole water supply system of the factory not need to use any fresh water. We cooperated with DANIELI, and provide the MBBR process package and technology service.

This WWT plant design capacity is 860 m3/h, it is the municipal waste water, the Inlet and MBBR outlet values as follows：

Solution

The treatment process is MBBR+UF+RO, and provide a new solution for the severe water shortage problem in Iran.   MBBR+UF+RO

The main characteristic of Moving Bed Biological Reactor (MBBR) configurations is that there is no sludge recycle from a secondary clarifier. MBBR is essentially a simple, once-through process, where all of the biological activity takes place on the biomass carriers. MBBR is usually followed by a solids separation system such as a secondary clarifier or DAF, in order to separate bio-solids

produced in the process from the final effluent. The main advantage of MBBR is robust and simple reduction  of  soluble  pollutants  (soluble  BOD  or  COD,  NH4  +,  etc.),  with  minimal process complexity, utilizing. 

Proposal
There are two sets of parallel operation MBBR tanks, each tank has seven sets aeration pipe, of which from one to six sets are the same, the rest of the final set near the media retention screen be added more areator, in order to prevent the media pilling up on the screen.
Results
The whole project implemented successfully, to be well received by the general contractor and the owner. The COD value of the effluent is below 30mg/l, keep a long term and stable run.