The addition of acid to manure to an optimum level of around pH 5 can fix the nitrogen. Further addition of acid to obtain a lower pH value does not improve the nitrogen fixation, for pH high than 5, ammonia losses are greater however not as great as if no acidification is done. The concentration of potassium is increased by the dehydration process and the addition to the manure of orthophosphoric acid (H3PO4-) results in a higher phosphorus concentration in the treated manure. The slurry resulting from the dehydration is difficult to handle and could be mixed to ground vegetable wastes to be used as organic manure.
The experiments were done on a small scale level. Some economic analysis is done for the acidification treatment however not much information is given on the dehydration process.