The present application relates to an iron impregnated biochar and its use as a fertilizer. The iron impregnated biochar of the present application has a ratio of iron (III) to iron (II) ranging from 5:1 to 10:1. The biochar may be produced by a method including treating the biomass with an iron (II) ion solution, pyrolyzing the iron (II)-treated biomass in an oxidative environment and recovering the biochar product from the pyrolyzed iron (II)-treated biomass.

The present application relates to an iron impregnated biochar and its use as a fertilizer. The iron impregnated biochar of the present application has a ratio of iron (III) to iron (II) ranging from 5:1 to 10:1. The biochar may be produced by a method including treating the biomass with an iron (II) ion solution, pyrolyzing the iron (II)-treated biomass in an oxidative environment and recovering the biochar product from the pyrolyzed iron (II)-treated biomass.

One or more embodiments of the present disclosure provide a special water-soluble fertilizer for delaying decay of a Huanglongbing (HLB)-affected tree. The raw materials of the special water-soluble fertilizer may include, in parts by weight, 3-5.5 parts of ammonium polyphosphate, 7.0-12 parts of ammonium nitrate phosphorus, 13-22 parts of potassium nitrate, 7.5-13.5 parts of ammonium sulfate, 0.8-1.5 parts of urea, 10.5-18 parts of EDTA chelated calcium, 12-21 parts of calcium magnesium nitrate, 3.5-7 parts of citric acid and 150-400 parts of straw vinegar; and a solid content of the straw vinegar may be greater than or equal to 15%. The raw materials may further include 1.3-2.5 parts of EDTA chelated manganese and 1.5-3 parts of manganese sulfate monohydrate. The raw materials may further include 0.25-0.5 part of disodium tetraborate pentahydrate.

One or more embodiments of the present disclosure provide a special water-soluble fertilizer for delaying decay of a Huanglongbing (HLB)-affected tree. The raw materials of the special water-soluble fertilizer may include, in parts by weight, 3-5.5 parts of ammonium polyphosphate, 7.0-12 parts of ammonium nitrate phosphorus, 13-22 parts of potassium nitrate, 7.5-13.5 parts of ammonium sulfate, 0.8-1.5 parts of urea, 10.5-18 parts of EDTA chelated calcium, 12-21 parts of calcium magnesium nitrate, 3.5-7 parts of citric acid and 150-400 parts of straw vinegar; and a solid content of the straw vinegar may be greater than or equal to 15%. The raw materials may further include 1.3-2.5 parts of EDTA chelated manganese and 1.5-3 parts of manganese sulfate monohydrate. The raw materials may further include 0.25-0.5 part of disodium tetraborate pentahydrate.

Disclosed are a system and method for efficient nitrogen and carbon removal and phosphorus recovery of source-separated fresh urine by biochemical combination. The system includes a functionally zoned membrane aerated biofilm reactor for in-situ nitrogen and carbon removal, a source separation toilet, a source-separated urine storage tank, a phosphorus recovery reactor, a calcium salt solution tank, a water production tank, and a control system. The membrane aerated biofilm reactor is divided into an upper part and a lower part, a micro-aerobic environment is formed in the upper part while an anaerobic environment is formed in the lower part, and thus nitrogen and carbon can be removed only in the membrane aerated biofilm reactor. The system disclosed by the present disclosure can achieve the goal of removing nitrogen and carbon by 95% and more without additional carbon source, and can meet the demand of in-situ sewage treatment on a train.

Disclosed are a system and method for efficient nitrogen and carbon removal and phosphorus recovery of source-separated fresh urine by biochemical combination. The system includes a functionally zoned membrane aerated biofilm reactor for in-situ nitrogen and carbon removal, a source separation toilet, a source-separated urine storage tank, a phosphorus recovery reactor, a calcium salt solution tank, a water production tank, and a control system. The membrane aerated biofilm reactor is divided into an upper part and a lower part, a micro-aerobic environment is formed in the upper part while an anaerobic environment is formed in the lower part, and thus nitrogen and carbon can be removed only in the membrane aerated biofilm reactor. The system disclosed by the present disclosure can achieve the goal of removing nitrogen and carbon by 95% and more without additional carbon source, and can meet the demand of in-situ sewage treatment on a train.

Disclosed are a fertilizer composition containing a carbohydrate and phosphorus and a preparation method and use thereof, which belong to the technical field of agriculture. The fertilizer composition has a mass ratio of carbon to phosphorus of 1-15:1, and is divided into a low-carbon fertilizer composition (with a carbon-to-phosphorus ratio of 1-4:1) and a high-carbon fertilizer composition (with a carbon-to-phosphorus ratio of 4-15:1).

Disclosed are a fertilizer composition containing a carbohydrate and phosphorus and a preparation method and use thereof, which belong to the technical field of agriculture. The fertilizer composition has a mass ratio of carbon to phosphorus of 1-15:1, and is divided into a low-carbon fertilizer composition (with a carbon-to-phosphorus ratio of 1-4:1) and a high-carbon fertilizer composition (with a carbon-to-phosphorus ratio of 4-15:1).

Disclosed are a fertilizer composition containing a carbohydrate and phosphorus and a preparation method and use thereof, which belong to the technical field of agriculture. The fertilizer composition has a mass ratio of carbon to phosphorus of 1-15:1, and is divided into a low-carbon fertilizer composition (with a carbon-to-phosphorus ratio of 1-4:1) and a high-carbon fertilizer composition (with a carbon-to-phosphorus ratio of 4-15:1).

A method of removing phosphates from water in a continuous process, the method comprising the steps of: (a) passing the water through a first zone in which the pH is adjusted; and (b) passing the water through a second zone in which the water is contacted with magnesium ions; wherein the water is contacted with ammonia in the first zone and/or in the second zone.