用微生物絮凝剂改善污泥沉降性能（With the improvement of sludge sedimentation performance of microbial flocculant）

用微生物絮凝剂改善污泥沉降性能（With the improvement of sludge sedimentation performance of microbial flocculant） 用微生物絮凝剂改善污泥沉降性能(With the improvement of sludge sedimentation performance of microbial flocculant) The microbial flocculant can improve the settling property of sludge. Microbial flocculant can effectively improve the settling property of activated sludge, prevent sludge from cracking and improve the treatment efficiency. Such as adding flocculant isolated from Rhodobon in erythropolis to have activated sludge bulking in the sludge after treatment with SVI (sludge volume index) decreased from 290 to 50, Ma Xichen of the Dalian Light Industry Institute used activated sludge microbial flocculant MF processing has been expanded, the sludge after treatment with SVI (sludge volume index) from 281 down to 54, treatment rate of 80.8%. But adding flocculation microorganisms in activated sludge can promote the settlement of sludge, and will not reduce the removal efficiency of organic matter. Microbial flocculants are metabolites of various functional proteins and functional polysaccharide substances produced by microorganisms or their secretions, it is the use of microbial technology, obtained by bacteria and fungi, fermentation, extraction, purification, water treatment agent is biodegradable and safety, non-toxic, no efficient two pollution. Because microbial flocculants can overcome the inherent defects of inorganic polymers and synthetic organic polymer flocculants, and ultimately achieve pollution-free emissions, it is called microbial flocculant. The molecular weight, molecular structure and shape of flocculants and their groups have influence on the activity of flocculants. Generally speaking, the higher the molecular weight, the higher the flocculating activity; linear molecular flocculating activity of high molecular branched or crosslinked more, flocculation is worse; in the later period of cultivation of flocculant producing bacteria, cell surface hydrophobicity enhancement, flocculant activity is also higher. The surface structure and charge of colloidal ions in water can also influence flocculation. Some reports indicate that the presence of cations in water bodies, especially Ca2+ and Mg2+, can effectively reduce the negative charge on the colloidal surface and promote the formation of "bridging". In addition, the presence of high concentrations of Ca2+ can protect the flocculant from degrading enzymes. Microbial flocculant has wide range of flocculation, high flocculation activity, and extensive conditions, most of which are not affected by ionic strength, pH value and temperature. Therefore, it can be widely used in wastewater treatment and industrial wastewater treatment. Bioflocculant has the advantages of high efficiency, safety and no pollution to the environment. It has great potential applications in the fields of medicine, food processing and biological product separation. With the city sewage treatment plant in the water body odor of microbial flocculant: efficient biological water purification agent PX development of Biological Bacteria Control System Inc in the United States Asia Limited, 22 thousand t/d treatment of municipal wastewater, adding a millionth, the odor control, BOD removal rate of 80% - 90% SS, the removal rate of 80% - 92%; 300 t/d Hotel sewage treatment, adding 1 g/t, 3 d after the odor disappears after 7 d, significant effect, oil separator oil is eliminated, the effluent BOD is 20 mg/L, COD 80 mg/L. Use of microbial flocculant to remove suspended matter in sewage: adding 2% Alcaligenes to latus in coking wastewater and the amount of calcium after incubation of the water suspended solids removal rate was 78%, and the same wastewater by polymeric ferric sulfate removal rate is 47%. The microbial flocculant was used for wastewater decolorization, and the decoloration rate of colored wastewater was 94.6% by using Alcaligenes latus culture medium and 1% of glucosamine. When Ma Xichen and other MF flocculants were used in the experiment, the decolorization rate was 91%. What is the mechanism of flocculation? Believe that many people are deeply puzzled, the following is to introduce the mechanism of flocculation: flocculation is a very complex physical and chemical processes. So far, a number of problems remain to be resolved. In theory, the views are inconsistent and need to be further explored and improved. The differences between theories and models may persist for a long time. Most people now believe that flocculation is the two process of flocculation and flocculation. The aggregation process is the process of destabilization of colloidal particles and formation of small agglomerates: flocculation is the formation of large flocs by the formation of small agglomerates at the bridge of the flocculant. Recently, coagulation has been defined as the surface charge of neutralized colloid and suspended particles, which overcomes the electrostatic repulsion between colloidal particles and suspended particles, and thus the process of particle destabilization is called condensation. It is nature, and particles using coagulant and destabilization particles to form large aggregates, the coagulant is inorganic salt, electrolyte, not including organic polymer flocculant, he gave flocculation definition: the colloidal and suspended particles in polymer flocculant, flocculation process under the action of the bridge body thick even become, in the flocculation process with coarse floc formation, there is charge neutralization. For example, some organic compounds have high flocculation and simultaneous neutralization with charge, bridging the bridge between the particles and forming a thick floc. There are other claims, but in addition to particle size and the charge on the particle surface, it has been confirmed by experiments. Other statements and theories are hypothetical and need to be verified by experiments. In fact, the flocculation is the small colloidal particles and suspended particles in colloidal material or electrolyte under the effect of neutralization of particle surface charge, reduce or eliminate the repulsive force between the particles. The particles are combined together, the volume becomes larger and larger, when the particle aggregation volume reaches a certain level (approximately 0.01cm particle strength). They are separated from the water, a flocculent precipitate flocs - this is what we observed. When polymer compounds are used as flocculants, colloidal particles and suspended particles are combined with polar groups or charged groups of polymers, and particles combine with polymers. Forming a bulky flocculent precipitate. Because the polymer polar or charged groups. In short time to make a combination of many particles, the volume increases speed, therefore, the formation of floc flocculation speed, obvious effect. That agglomeration is the process of quantitative change particle size, and flocculation is quantitative qualitative change process of flocculation process to achieve a certain level is composed of a plurality of aggregation and agglomeration is the result of. Coagulation is the cause of flocculation. Usually, the mechanism of flocculation, the nature of flocculant, polyaluminium chloride, the properties of colloidal or suspended substance, and the conditions affecting flocculation are called flocculation chemistry, which is the mechanism of flocculation. URL: www.lvyuanpac.com Original address: