Research On Preparation Of Multi-functional Soil Of Urban Botanical Gardens By Using Of Sludge Hydrolysis Residues

The sludge generated from sewage treatment plants in China were huge amount. The investment and treatment of Sludge has been becoming a heavy burden of urban sewage treatment plant. We obtain sludge protein and sludge hydrolyzing residue by high-temperature alkaline hydrolyzes, filtration, concentration of residual activated sludge from sewage treatment plant. The two-part will be treated separately to achieve utilization of sludge. Our research is on preparation of multi-functional soil of urban botanical gardens by using of sludge hydrolyzing residue, to solve the utilization of the sludge hydrolyzing residue part. Planting garden flowers by using the sludge hydrolyzing residue added to super absorbent polymers, and testing the various parameters of multi-functional soil of urban botanical gardens and its effects on growth of plant, results showed that:Heavy metal ions of Sludge hydrolyzing residue is far below the national standard of agricultural sludge, and with the high nutrient content, equivalent to the fertilized soil. So it’s feasible as soil of urban botanical gardens. Mixed with super absorbent polymers, the mixture not only met the requirements of soil of urban botanical gardens, also less fertilizes, less cultivate, less water and not even water. The mixture could be a multi-functional soil of urban botanical gardens. The moisture content of the mixture of sludge hydrolyzing residue and super absorbent polymer was significantly higher than the control group, and with the increase of the content of super absorbent polymers, the moisture content of it also will increase. When the content of super absorbent polymers was2.00%, the moisture content of the mixture of residua and SAP was72.10%,54.40%higher than the control group. According to correlation analysis and the cost of super absorbent polymer, the optimal concentration was2.00%. By studying the changes of heavy metal ions of leachate outflow from sludge hydrolyzing residue which mixed with super absorbent polymer, we could make out the heavy metal ions adsorption characteristic of it. And we sent two groups at the same time.including the mixing and foreshadowing of the mixture of residua and SAP. The results showed that the super absorbent polymer could adsorbed some kind of heavy metal ions, while the way of adding super absorbent polymer to the sludge hydrolyzing residues can impact on their adsorption characteristics. The plants grown in the mixture of residua and SAP were growing better than the control group. In the high temperature conditions of outdoor, Oxalis articulata Subsp rubra which planted in the residue mixed with2%of super absorbent polymer flowering normally, and flowering9days earlier on average than other each control group. Canopy breadth of the Oxalis articulata Subsp rubra when it’s flourish was1.38times of the residue control group, and was3.05times of the natural soil control group. The lifetime of Rhododendron simsii&R.spp. and Euonymus Japonicus cv. Aureo-ma were15-20days longer than control group. Maximum leaf area of Alocasia macrorrhizos when it’s flourish was1.12times of the residue control group, and was1.69times of the natural soil control group. After the Peperomia tetraphylla A. Dietr. grown two months, the moisture content of the mixture of residua and SAP was292.57%higher than the residue control group, and1056.80%higher than the natural soil control group. The high moisture content provides a guarantee to the growth of plant. This article discussed the feasibility of agricultural use of sludge hydrolyzing residue, have broaden application prospects, and the sludge hydrolyzing residue lay the foundation for the further utilization.