Corporate News

At present, stevia manufacturers generally carry out anaerobic fermentation together with industrial wastewater to produce biogas. The biogas mud produced is rarely used as fertilizer, and some even bury it. The cost of waste leaf residue treatment is relatively high, which causes a great cost to the production enterprises, and the waste reutilization rate is very low, which cannot fundamentally solve the problem of environmental governance.

Refined organic fertilizer nutrition contains a certain amount of organic matter, which has the effect of improving soil, balancing nutrition, promoting growth, resisting diseases and insect pests and increasing production, and can improve the quality of crops. The use and promotion of organic fertilizer at the same time meet the requirements of green food and pollution-free food in China, so the demand for organic fertilizer only by the traditional composting is far from enough, to open up a new organic fertilizer source is in line with the market demand.

Speaking of compound microbial fertilizer is the use of modern comprehensive microbial technology, the organic fertilizer and microbial fertilizer, inorganic N, P, K fertilizer, micro fertilizer and other combination of science, is a kind of pleiotropic new compound fertilizer, with comprehensive nutrients, long-term and quick effect, improve fertilizer utilization rate, improve soil structure and physical and chemical traits, mediation microbial environment, improve fertility effect obviously, and become one of the new fertilizer, especially the cash crop dosage will be more and more large. Method of processing composite microbial fertilizer with stevia leaf residue: after decay and promotion treatment and microbial aerobic fermentation, remixed with N, P, K and other nutrients, and inoculated with high active functional bacteria into compound biological fertilizer.

Compound biological fertilizer contains organic matter fertilizer, acid and inorganic organic fertilizer, biological organic fertilizer, trace element fertilizer and plant auxin and other effective ingredients, and has high organic matter content, strong biological activity, significantly improve the soil structure, enhance soil fertility and water and fertilizer conservation and other advantages, especially suitable for the preparation of special fertilizer for different crops.

Market prospect and economic benefit analysis. With the continuous publicity and promotion of organic fertilizer in our country market, the majority of farmers have generally realized the benefits of using organic fertilizer, especially in the cultivation of vegetables and fruits, organic fertilizer has more powerful advantages. In 2007, the national vegetable planting area of 273.25 million mu, fruit planting area of 22.95 million mu, tea garden planting area of 14.31 million mu, according to the current farmers' fertilizer habits, each ton of fertilizer can use about 4.5 mu of land, only these three items, the annual fertilizer use is more than 50 million tons, organic fertilizer market potential is huge. The use of stevia leaf residue is a project advocated by the country for environmental protection and to solve the problems of agriculture, rural areas and farmers. Therefore, processing stevia leaf residue for organic fertilizer is a win-win project to protect the environment and the enterprise economy.

Method 1. natural direct heap repost

Analysis: The purified stevia leaf residue has high water content and itself has good fermentation conditions. The method of direct compost to produce organic fertilizer, does not need other conditions, simple and practical.

 Operation method: the stevia leaf residue collected directly transferred to the fermentation tank, accumulation of appropriate height, to ensure a certain temperature, regularly check the temperature in the center of the leaf residue pile, and often turn over to ensure the uniform ripening to avoid high temperature and inhibit the ripening process. After a certain time of decay, the volume of the leaf residue pile is reduced, and when the pile temperature is reduced, it can be used as fertilizer.

Analysis: The purified stevia leaf residue has high water content and itself has good fermentation conditions. The method of direct compost to produce organic fertilizer, does not need other conditions, simple and practical. Operation method: the stevia leaf residue collected directly transferred to the fermentation tank, accumulation of appropriate height, to ensure a certain temperature, regularly check the temperature in the center of the leaf residue pile, and often turn over to ensure the uniform ripening to avoid high temperature and inhibit the ripening process. After a certain time of decay, the volume of the leaf residue pile is reduced, and when the pile temperature is reduced, it can be used as fertilizer.

Disadvantages: the piling time is long, the fertilizer effect is relatively low, there is a certain pollution, the use is not convenient, and insufficient rotten organic fertilizer is the main source of crop soil transmission disease, the use of insufficient rotten leaf residue fertilizer will also cause root burning, burning seedlings and other adverse consequences.

Method 2. Add other organic substances mixed with heap retting

Analysis: our country has a rich crop straw resources, the most commonly used treatment method is on-site incineration, although it can to a certain extent increase the soil fertility, burn weeds pests, but also cause serious air pollution, smoke also affect the air and land traffic, is also a huge waste of biomass resources.

Operation method: after crushing these straw resources into the organic fertilizer of the compost, it can effectively mediate the water in the composting, and also increase the organic matter and mineral nutrients in the composting, which can obtain a better composting effect. The specific operation is to use the crushing equipment to cut the crop straw short to the appropriate length, and then mix with stevia residue compost. In the process of stacking retting, the stacking temperature can reach a certain temperature, and last for a long time, which can effectively kill the pests and eggs on the sugarcane leaves, and avoid spreading the diseases and insect pests to the crops when applied. It can also add dried puffed chicken manure after high temperature disinfection, increase the content of organic matter in the matrix, increase the content of slow acting nitrogen in the matrix after fermentation, the cultivation process can reduce the amount of quick acting nitrogen, reduce the content of NO3-in crops, and also make up for the disadvantage of excessive heavy metals in chicken manure fertilizer. Compost pattern is similar to natural composting.

Disadvantages: the production process is troublesome, the heavy metal content in the chicken manure fertilizer is too high, and many matters needing attention.

Method 3: Process biological organic fertilizer

Analysis: biological organic fertilizer is in the organic material to add organic starter, through biological fermentation treatment, make the organic fertilizer deodorization, rot, insecticidal, sterilization, harmless treatment into a kind of both microbial fertilizer and organic fertilizer effect of fertilizer.

Operation method: using stevia residue processing biological organic fertilizer for retting to reduce the overall moisture content of leaf residue, namely add a certain proportion of crushed dry material, such as straw powder, chicken manure, wood bran, chaff, etc., fully mixed after the overall water control in 65%, to give full play to the activity of microorganisms, mixed with promote material decomposition, rot and deodorization function of nonpathogen agent, material rot after add functional bacteria, with nitrogen fixation, phosphorus bacteria, silicate bacteria, can product fertilizer effect. Because the stevia residue is acidic, a certain amount of lime powder should be added simultaneously to make the pH value of the pile roughly neutral, in order to facilitate the growth of beneficial microorganisms. After high temperature fermentation for a period of time, all the raw materials in the composting can be mature, the stench disappears, and kill the pathogens, insect eggs and grass seeds in the raw materials. This fertilizer is slightly cooled and screened, bagged into commercial fertilizer, and can also be processed into granular fertilizer. It can improve soil physical properties, improve soil microecosystem, stimulate crop growth, prevent soil-borne diseases, purify soil environment, improve yield and improve quality.

Disadvantages: the production process is troublesome, suitable for enterprise standardized production. Personal investment is insurance.

 

---

Previous：

Next：Application of Membrane Technology in Stevia Extraction Process