JP2010047645A - Water-retaining solidifying and conditioning agent for soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-retaining solidifying and conditioning agent for soil that maintains soil in a neutral range so as not to exert influences on vegetation, can condition soil into a state of soil aggregation suitable for plant growth, serves the purposes in a small added amount permitting reduction in cost for soil conditioning, and is effective for tree planting of an arid land or a desert or for prevention of sand flowing. <P>SOLUTION: The main raw material of the water-retaining solidifying and conditioning agent for soil is a porous adsorbing material that is composed of at least one natural mineral or has been made porous by heating. The porous adsorbing material has been shaped by crushing the natural mineral or the carbide baked at a high temperature into an appropriate particle size by means of a crushing machine. A suitable amount of a neutral water-retaining flocculating agent made from starch as a raw material is admixed with the porous adsorbing material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a soil water retention solidification improving agent effective for preventing solidification of sludge in ponds, rivers, seas, etc., or preventing desert greening and coastal sand flow by increasing water retention of dry soil. .

Conventionally, as soil improvers, cement-based and lime-based materials, synthetic polymer polymers based on petroleum, paper sludge, fly ash, and gypsum-based materials are known.
JP 2008-50522 A JP 2007-237159 A

  Among the various soil improvers described above, the soil improver mainly composed of cement or lime has the disadvantage that the soil to which it is added changes to a high alkalinity and adversely affects plant growth. In addition, the soil alkalinization spreads to the surrounding area over a long period of time, and there is also a harmful effect that the soil and water quality are changed to cause damage to the surrounding environment. Moreover, since it takes a long time to solidify the soil, there is a possibility that secondary pollution will occur due to elution by rainwater or the like until it dries out.

  Next, the use of a synthetic polymer-based soil conditioner reduces the water permeability of the improved soil and makes it poorly drained, resulting in a problem of adversely affecting vegetation such as plant root rot. is there. Moreover, the treatment of sludge with a high water content is not easy, and there is a drawback that it is difficult to spontaneously decompose synthetic polymers.

In addition, paper sludge, fly ash, and gypsum-based soil conditioners require a large amount of addition (up to 35% by weight or more) to the soil, increase the cost of transporting raw materials, and the amount of processed material. There is a problem that increases. In addition, there is a drawback that it is not hydrophobic and is likely to be eluted into rainwater.

  Furthermore, some of the conventional solidifying agents are not suitable as a soil conditioner because they have little deodorizing effect on organic substances.

  The present invention has been made in view of various disadvantages of the prior art, and is effective for use in dry land and desert greening and sand flow prevention because it increases the water retention of soil and prevents water outflow. The purpose of the present invention is to provide a soil water-retaining and improving agent that can reduce the soil improvement cost because it can maintain the pH of the soil in a neutral region without affecting the vegetation and the amount added is small.

  The means of the present invention configured to solve the above-mentioned problems is mainly composed of a porous adsorbent made of one or more natural minerals or made porous by heating the raw material. It consists of a mixture of a neutral water retention flocculant made from starch.

  And the said porous adsorbent is good in the said raw material being heated at the high temperature of 800 degreeC or more.

  The porous adsorbent may be formed into a granular shape having an appropriate particle size by crushing treatment.

Since the present invention is configured as described above, the following effects are obtained.
(1) Since the soil to which the water retention-improving agent for soil according to the present invention is added has a high water retention function by a hydration reaction, it is extremely effective for greening of dry land and deserts, and prevention of sand flow.
(2) The soil water retention solidification improver can be improved to soil having high permeability, water retention, and fertilizer retention by porosity and hydration reaction.
(3) Since the soil improved with the water retention-improving agent for soil can maintain the pH in a neutral range, it does not affect vegetation. In addition, it does not alkalinize ground water or runoff water that becomes secondary pollution of the environment.
(4) Since it becomes a ground with good hydrophobicity, the improved soil does not dissolve in water before and after drying, and soil loss can be prevented.
(5) Since the solidification speed of the soil is as fast as several tens of seconds, the efficiency of the solidification work can be improved.
(6) Since the amount of water retention solidification improver for the soil to be used is sufficient, the cost can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail. The main raw material of the soil water retention solidification improver consists of a porous adsorbent composed of one or more natural minerals. The porous adsorbent is formed into a granular shape by crushing a natural mineral to an appropriate particle size of 0.1 to 0.001 mm using a crusher. The reason why the porous adsorbent is used as the main material is that it has water absorption and water retention by itself and supports starch described later.

  In addition to natural minerals, a porous adsorbent formed into a porous shape by heating and carbonizing raw materials such as wood and bamboo at a high temperature of 800 ° C. or higher may be used. Heating at a high temperature of 800 ° C. or higher is to surely form a porous material.

  The raw material starch is processed into a modified starch, and an appropriate amount of a neutral water retention flocculant obtained from the modified starch is mixed with the porous adsorbent as the main material. The mixed neutral water retention flocculant adheres to the surface of the porous adsorbent by binding to moisture in the soil and is supported in a porous manner. The reason why the neutral water retention flocculant is mixed is that it has water absorption and water retention.

  The mixing ratio of the neutral water-holding flocculant to the porous adsorbent is preferably 1/100 to 1/5 in weight ratio.

  In addition, as a field where the water retention property improving agent for soil according to the present invention can be used, sludge treatment in ponds, rivers, seas, reuse of dredged soil, solidification molding of temporary roads for work, improvement of solidification of roadbed and roadbed, Examples include improvement of soil quality in built-up housing land, improvement of sedimentation sludge such as aquaculture pond and lotus pond, solidification such as treatment of industrial waste such as bentonite and soil improvement, greening of dry land and desert, prevention of sand flow.

Claims (3)

  A porous adsorbent made of one or more natural minerals or made porous by heating the raw material is used as a main raw material, and mixed with a neutral water retention coagulant made from starch as a raw material. Water retention solidification improver.   The soil water retention solidification improver according to claim 1, wherein the porous adsorbent is obtained by heating the raw material at a high temperature of 800 ° C or higher.   2. The soil water retention solidification improver according to claim 1, wherein the porous adsorbent is formed into particles having an appropriate particle diameter by crushing treatment.