Chriwa Group - Water matters. We care.

Treatment and energy recovery from brewery waste water

Combination of anaerobic and aerobic technology incl. energy recovery

Construction of the plant was carried out as a turnkey project. Thereby the design, equipment delivery, permitting, construction supervision, erection and commissioning up to the final acceptance of the entire wastewater treatment plant (WWTP) and the connecting pipelines to the existing system were in responsibility of CUSS.

The project was successfully completed in 2012 in close cooperation with a Ukrainian design institute and installation company.

NUMBERS & FACTS:

• Country: Nikolaev, Ukraine

• Hydraulic plant capacity: 4 950 m³/d

• Organic Load: 19 000 kg/d (COD)

• Year(s) of construction: 2011/2012

CONCEPTUAL FORMULATION

The main task of the WWTP was to treat the entire production wastewater of the Nikolaev Brewery with a high degree of efficiency so that the strict local authority regulations could be met, and the purified water finally discharged into the municipal sewer system. Further requirements have been a compact design and an energy-saving and state-of-the-art process technology.

A continuously mixed reactor, also known as CSTR (Continuous Stirred Tank Reactor), was selected for the anaerobic treatment process. This technology is very advantageous for frequently changing wastewater ingredients in terms of power consumption and process reliability. Compared to other anaerobic reactors, the CSTR process is less sensitive to temperature drop. Also, no pellet sludge is required, just flocculated sludge, which is easier to get in Ukraine.

Another customer’s requirement was to recover energy from the biogas produced in the CSTR -reactor and to use it for heating of water up to about 30°C. This approach reduced the cost of water treatment and at the same time provided environmentally friendly and modern technology. For this purpose, a hot water boiler had been chosen, where the continuously produced biogas has been burned, and produced hot water warmed up the cold wastewater by means of a heat exchanger.

Aerobic post-treatment stage is carried out in an Aerotank with following Lamella-separators for sludge holding. At this stage, both the organic contaminants and the nitrogenous components are widely degraded under the input of oxygen, and the required effluent limits are achieved. Part of the treated wastewater is reused as service water. The partial flow is taken from a storage tank and further treated so that this water could be used for internal processes such as equipment cleaning, production of solutions needed for the process and other purposes.

The process reservoirs are made of high-quality glass lined steel plates. These are sealed and bolted together, so that after assembly by qualified personnel a long-living and tight process tanks have been mounted.

In order to provide an optimal communication with the customer and also to fulfill the local requirements in each case, the native speaking specialists were also involved in this project during commissioning and training phases.

WASTEWATER COMPONENTS:

 

 

 

 

 

 

PROCESS STEPS: