Can I Use An Oxygen Mass Flow Controller To Air Wastewater Treatment – A New Technology Promises Higher Efficiency at Lower Cost

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Wastewater Treatment – A New Technology Promises Higher Efficiency at Lower Cost

A new technology in wastewater treatment called Advanced Immobilized Cell Reactor Technology, now available, promises benefits such as:

* Up to 25% lower plant costs

* Up to 50% lower operating costs

* Up to 50% lower maintenance costs

* Up to 90% less sludge production

* Up to 60% smaller footprint (you can even place it underground or on the roof)

* Rapid plant establishment (2 to 6 weeks for small/medium sized plants)

* Ensures a high level of purity of treated water as shown below:

(i) BOD (biological oxygen demand): less than 5 mg/litre,

(ii) COD (chemical oxygen demand): less than 60 mg/liter (or even more)

* Meets all input specifications of waste water from large industries/cities/towns.

It has various applications:

* Small sizes for industrial and domestic use.

* Can also be created in a standard size slide mounted form

* Can be easily and cost-effectively installed in small homes, individual/small business units such as car washes, bakeries, restaurants, mini-hotels, etc., and rural area installations.

* Can also be installed with a sludge handling model or a domestic sludge absorption model

* It can be used to facilitate the reuse of water for purposes such as golf courses, toilets, gardening and even washing.

* Or simply release the treated water to recharge the groundwater.

In addition, it is cost-effective to run small-scale plants using this technology anywhere in the world, with mostly domestic materials and according to local standards. This technology has been successfully implemented in many locations.

Advanced ‘immobilized cell reactor’ technology can also be used to treat domestic wastewater. Domestic wastewater is complex due to the presence of organic, inorganic chemicals and organisms, both pathogenic and non-pathogenic. Conventional biological treatment systems do not satisfactorily remove dissolved organic matter and microorganisms. In addition, the systems are not efficient enough to recover water for reuse.

Integrated biological and chemical oxidation takes place in a single reactor. The reactor consists of a tall column filled with activated carbon. Activated carbon is immobilized by chemo-autotrophs. The oxygen required for the oxidation of organic substances in the waste water is supplied in the form of compressed air from the bottom of the reactor. The countercurrent movement of the liquid and air streams allows the dissolved organic matter to oxidize and desorb the converted products, so that the activated carbon maintains its activity throughout the operation. Domestic wastewater treated with an advanced ‘immobilized cell reactor’ system reduced BOD by 94%, COD by 90% and sulfide by 100%.

However, the technology also has some limitations:

* The permeability index is lower than that of sand filters

* The maximum organic loading rate allowed is limited

* Effectiveness is limited by the presence of suspended solids in the wastewater.

* Anaerobic treatment is an essential unit of operation prior to proceeding to an advanced ‘immobilized cell’ reactor to reduce wastewater viscosity and remove colloidal solids.

* Multiple modules are required for processing large quantities instead of a single module.

In conclusion, the advanced technology of the ‘immobilized cell reactor’ can be used in a wide range of industries. It performs at a credible level in the removal of organic substances rated as BOD and COD from wastewater produced in the manufacture of leather garments, textile yarn dyeing, sago, chemical and pharmaceutical industries.

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