Advantages:
- the canal system was a system with high efficiency of nitrogen and water well
* Construction cost disadvantages: low
- the cost of construction and operation, high use more space than
.Education supervisor system must have knowledge system as well
.] walk this type of treatment system is extremely complicated because you have to have คุมสภาวะ control environment and physical characteristics. For optimal performance and increasing the number of microorganisms.If there is no good care to make devices such as Aeration damaged easily
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