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US 11,401,188 B2Granted
Sludge dehydration system and sludge dehydration method
AssigneeIshigaki Company Limited
InventorsManabu Yamashita, Masakazu Morita, Hiroyuki Mino, Yasuaki Nishihara, Atsushi Yanai, Ryosuke Tamauchi, Yasutaka Suetsugu, Masayoshi Katayama
Life of this patent
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Abstract
A sludge dehydration method includes a recovery process of recovering specific material as a dewatering aid from sludge generated in a sewage treatment process and a dewatering process of performing solid-liquid separation on sludge in which the dewatering aid recovered in the recovery process and dewatering target sludge are mixed.
Claims19
A sludge dehydration method comprising:
- recovery by recovering in a recovery device specific material as a dewatering aid from sludge generated in a sewage treatment;
- an operating time determination by determining an operating time of a dewaterer as needed according to an amount of the sludge generated in the sewage treatment,
- wherein the recovery includes:
- preparation by fragmenting a solid in the sludge to obtain prepared sludge;
- separation by separating hardly decomposable organic matter and easily decomposable organic matter from the prepared sludge;
- extraction by continuously extracting specific hardly decomposable organic matter that has specific properties as the dewatering aid from the hardly decomposable organic matter that has been separated;
- and
- supplying the dewatering aid from the recovery device to a dewatering target sludge in a mixing tank according to the operating time of the dewaterer determined as needed in the operating time determination;
- and
- dewatering with the dewaterer by performing solid-liquid separation on a mixed sludge in which the dewatering aid recovered in the recovery and the dewatering target sludge have been mixed in the mixing tank.
7 more elements
A sludge dehydration method comprising:
- recovery by recovering in a recovery device specific material as a dewatering aid from sludge generated in a sewage treatment;
- a supply amount calculation including:
- calculating a predicted total recovery amount of the dewatering aid to be recovered in a continuous predetermined period set in advance in the recovery, based on an actual recovered amount of the dewatering aid and a sludge information being an information of an amount of the dewatering aid contained in an influent water which varies according to a season, a day of a week, and a weather;
- calculating a predicted total sludge amount of a dewatering target sludge to be dewatered in the continuous predetermined period set in advance in a dewatering, based on an actual sludge amount of the sludge generated in the sewage treatment and the sludge information;
- and
- calculating a supply amount for distributedly supplying the dewatering aid of the predicted total recovery amount to the dewatering target sludge of the predicted total sludge amount,
- wherein the recovery includes:
- preparation by fragmenting a solid in the sludge to obtain prepared sludge;
- separation by separating hardly decomposable organic matter and easily decomposable organic matter from the prepared sludge;
- extraction by continuously extracting specific hardly decomposable organic matter that has specific properties as the dewatering aid from the hardly decomposable organic matter that has been separated;
- and
- supplying the dewatering aid from the recovery device to the dewatering target sludge in a mixing tank according to an operating time of a dewaterer determined as needed based on the predicted total recovery amount calculated in the supply amount calculation;
- and
- dewatering with the dewaterer by performing solid-liquid separation on a mixed sludge in which the dewatering aid recovered in the recovery and the dewatering target sludge have been mixed in the mixing tank.
11 more elements
Dependencies are inferred from the claim text.