We were satisfied with the results, as they greatly exceeded the expectations we had at the time of adoption (Introduced by the Sewerage Section of Hamada City (formerly Misumi Town), Shimane Prefecture)
History of equipment introduction
There was only one sludge treatment facility in Hamada City, and this facility was operating normally, while making repeated expansions and renovations.
However, we process more sludge every year, and have exceeded our facility treatment capacity (106 m3/day), but had not examined any options, taking an optimistic attitude that we could examine options when excess processing posed a problem to our facility. Therefore, we took a second look at our “livestock composting facility”, which we had planned for other projects since we were in Misumi. We thought that if we could build a facility capable of processing sludge generated from farm village drainwater together with livestock manure, we could solve each other’s problems as if killing two birds with one stone.
The reason we chose Miraie
Making comparisons is an unavoidable part of planning,
- Transport and treatment of sludge to sludge processing facilities as before
- Construction of a resource recycling facility
- After dehydration at a processing plant, transportation to a recycling facility
- Dehydration and drying at a processing plant
Following a comparative examination of maintenance costs 10 years on for the above 4 cases, we came to the conclusion that it would be cheaper to build a resource recycling facility. Based on these results, we considered and decided to build a facility that will satisfy the following five requirements.
- Not necessary to secure a spacious facility area.
- Equipment that will be operated is easy to handle.
- Construction costs are low.
- The product can be returned to farm land and is as odorless as possible.
- The cost when using auxiliary materials is affordable.
Evaluation since introduction
This was the first installation area in the western part of Shimane Prefecture. Despite Miraie’s head office being in Matsue, they carefully responded to every request, from start up operation of equipment to product management.
Except for the fact that it took 42 days to complete the product and the tight control of fermentation temperature, it far exceeded our expectations at the time we adopted it.
It seems like nothing can be done about foul odors generated from the product during fermentation and right after stirring sludge and auxiliary materials. It is impossible to seal the building, so it would be better for Miraie to consider improvements that will eliminate odors when stirring.