JPS59184783A - Treatment and regeneration of eichhornia crassipes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the treatment of aquatic plants used for the purification of water bodies, and particularly relates to a treatment and reuse method suitable for water hyacinth.

In recent years, methods have been used to purify water bodies by cultivating small aquatic plants and ingesting nutrients from the water. Due to its low moisture content, it rots and gives off a foul odor if left unattended, and its fibrous nature makes it difficult to turn it into a post, making it difficult to dispose of it. For this reason, they were doused with heavy oil and incinerated, dried and scattered on farmland, but these had disadvantages such as high fuel costs and the ability to accumulate without being decomposed in farmland. Then, focusing on the fact that it begins to rot, we put the water hyacinth in a storage tank and let it rot with -S. This increases the concentration of organic matter in the juice and also reduces anaerobic production.

By squeezing with a press machine such as a roller press or screw press, the seeds become separated and planar, increasing the surface area and making the roots particularly thin and very easy to dry. It is difficult to ferment water hyacinth aerobically as it is, but it is dried and mixed with sludge etc. to reduce the water content to 4.
Composting can be achieved by adjusting the content within the range of 0 to 60%.

The present invention focuses on this point and proposes a method for processing and reusing water hyacinth, which recovers effective digestive gas from the water hyacinth, which is difficult to process, and converts the dehydrated and separated residue into a waste post. That is, the present invention deals with the treatment of water hyacinth cultivated and collected for the purpose of purifying water bodies.
The collected water hyacinth is temporarily stored and allowed to partially rot.
After that, it is squeezed to separate solid and liquid, and the squeezed juice is used for methane fermentation, and the separated residue is mixed with the digested sludge discharged from the methane-producing cypress, and aerobic fermentation is performed to make compost. The main idea is to collect KD of digestive gas and obtain good quality phlegm.

The present invention will be explained below with reference to flowcharts of water hyacinth treatment and recycling methods shown in the drawings.

Unnecessary water hyacinth is collected from ponds, rivers, lakes and marshes where water bodies are purified, and other water hyacinth cultivation areas, and is stored as is in a storage bit or the like for temporary storage. During this storage, the water hyacinth begins to rot due to microorganisms that adhere to the stems and roots of the water hyacinth. This water hyacinth is mostly fibrous as it is, and even when squeezed, the concentration of organic matter in the juice is low, but it can be stored and a high-concentration juice can be obtained, and at the same time it is also used in the process of adapting to anaerobic digestion. Next, the water hyacinth that has begun to rot is sent to a pressing process such as a screw press or roller press, where solid-liquid separation is carried out using a compressor.

For methane gas fermentation, it is necessary for the fermentation liquid to have good fluidity, and by separating solid and liquid in this pressing step, a fermentation stock liquid with high concentration and good properties can be obtained. On the other hand, water hyacinth has a high moisture content (approximately 95%), and the stem part of the stem is large and absorbs water, so it takes a long time to dry. However, when the shape is completely changed by the press, the surface area increases, the drying period is greatly shortened, and the roots, which are particularly difficult to decompose, are shredded. This solid-liquid separated solid, that is, separated scum, is sent to a drying process, and the juice is sent to a methane fermentation tank and stored there, where methane gas, or digestion scum, is generated. is used to heat the methane fermentation tank, and the digested sludge produced in large quantities in the methane fermentation tank is dehydrated and used as a raw material for phungpost.
The waste liquid is returned to the water hyacinth cultivation area together with the sludge-removed water and purified before being discharged. The dehydrated cake of digested sludge is mixed with the dried separated waste, the moisture content is adjusted to 40-60%, and this is aerobically heated. The mixture is sent to a fermentation tank, etc., where rapid aerobic fermentation is performed using forced ventilation. It is difficult to use water hyacinth alone to make a dung post, but if it is dried and mixed with sludge etc., it can be fermented to a water content of 40 to 60% of heavy metal.

The thus treated water hyacinth is used as a funpost and an excellent soil damage improver. The fertilizer components consisting of water hyacinth and dehydrated sludge thus obtained are shown in the table below.

In general, sludge waste such as digested sludge has sufficient nitrogen and phosphorus but is low in potassium components, but because of the large amount of potassium components contained in water hyacinth, the resulting compost has a suitable N:P: ratio.

According to the present invention, the water hyacinth used for water purification is used as a material for both methane fermentation and aerobic fermentation, and is converted into a useful *source of digestive gas and compost. The digested sludge that is discharged is used as a raw material for composting, part of the digested gas is used to heat the methane fermentation tank, and the waste liquid is slightly heated and returned to the water hyacinth cultivation area for purification. At this time, the heated waste liquid promotes the cultivation of water hyacinth, and the present invention is a closed system with no waste, making it possible to effectively utilize the water hyacinth used to purify water bodies. Instead of incinerating it at all the fuel costs, it was difficult to decompose and accumulated in the soil when it was returned to agricultural land by drying it, which caused problems, but by composting it, it becomes an excellent soil conditioner. It has the following advantages.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a flowchart showing the method for processing and reusing water hyacinth according to the present invention.

Claims (1)

[Claims] In the treatment of water hyacinth cultivated and collected for the purpose of purifying water bodies, the collected water hyacinth is temporarily stored and partially rotted, then squeezed to separate solid and liquid, and the juice is used to generate methane. , The processing of water hyacinth is characterized by collecting the digestive gas from the water hyacinth and obtaining high-quality compost by mixing the separated waste with the digested sludge discharged from the methane fermentation tank and composting it using aerobic combustion. , reuse method.