Organic Matter and Microbial Cell Density Behavior during Ion Exchange Demineralization of Surface Water for Boiler Feedwater

Few studies have focused on the combined application of digestate and straw and its feasibility in rice production. Therefore, we conducted a two-year field experiment, including six treatments: without nutrients and straw (Control), digestate (D), digestate + fertilizer (DF), digestate + straw (DS), digestate + fertilizer + straw (DFS) and conventional fertilizer + straw (CS), to clarify the responses of rice growth and paddy soil nutrients to different straw and fertilizer combinations. Our results showed that digestate and straw combined application (i.e., treatment DFS) increased rice yield by 2.71 t ha−1 compared with the Control, and digestate combined with straw addition could distribute more nitrogen (N) to rice grains. Our results also showed that the straw decomposition rate at 0 cm depth under DS was 5% to 102% higher than that under CS. Activities of catalase, urease, sucrase and phosphatase at maturity under DS were all higher than that under both Control and CS. In addition, soil organic matter (SOM) and total nitrogen (TN) under DS and DFS were 20~26% and 11~12% higher than that under B and DF respectively, suggesting straw addition could benefit paddy soil quality. Moreover, coupling straw and digestate would contribute to decrease the N content in soil surface water. Overall, our results demonstrated that digestate and straw combined application could maintain rice production and have potential positive paddy environmental effects.

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Removal of the Neutral Dissolved Organic Matter (NDOM) from Surface Water by Coagulation/Flocculation and Nanofiltration

Analytical Letters ◽

10.1080/00032719.2021.1885040 ◽

2021 ◽

pp. 1-14

Author(s):

Sami Khettaf ◽

Roumaissa Boumaraf ◽

Fatiha Benmahdi ◽

Kamel-Eddine Bouhidel ◽

Mohammed Bouhelassa

Keyword(s):

Organic Matter ◽

Surface Water ◽

Dissolved Organic Matter

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Upgrading of waterworks with a new biooxidation process for removal of manganese and iron

Water Science & Technology ◽

10.2166/wst.1998.0348 ◽

1998 ◽

Vol 37 (9) ◽

pp. 121-126 ◽

Cited By ~ 4

Author(s):

T. Hedberg ◽

T. A. Wahlberg

Keyword(s):

Organic Matter ◽

Water Treatment ◽

Surface Water ◽

Pilot Plant ◽

Previous Treatment ◽

Full Scale ◽

Unit Operations ◽

Treatment Water

The paper describes how waterworks can be upgraded by the use of microbiologically unit operations to make it possible to remove manganese from groundwater and surface water. Pilot plant studies and full-scale plant studies show that conventional oxidants as permanganate may be replaced by biooxidation thus reducing the use of chemicals in water treatment. Water containing high amounts of Fe and/or Mn and organic matter may be difficult to treat and pilot plant studies are therefore recommended. This study shows that one ground waterworks and one surface waterworks succed in removing manganese where previous treatment with permangante had failed.

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