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| Optimization and experimental study on structural parameters of biological cells |
| LI Pengcheng1,2, SU Yongjun1, JIA Yue1, HAO Fang1* |
| 1. Cangzhou Remote Sensing and Intelligent Water Conservancy Technology Innovation Center of Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061001, China; 2. School of Civil Engineering and Water Conservancy, Shandong University, Jinan, Shandong 250012, China |
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Abstract The structural configuration and parameter selection of biological cells were studied to reveal its effect on rainwater storage and purification in central Shandong. Four representative factors of plant species, soil configuration, filter layer and particle size of filter layer were selected, three levels were set for the selected factors, 9 groups of test schemes were set through outdoor orthogonal test, and the corresponding test index parameters of storage and purification effects were analyzed by range analysis method, Using the TOPSIS multi-objective analysis and decision-making method, the comprehensive indexes were obtained, the significant factors were determined, and the scheme was provi-ded for the structural configuration. In terms of rainwater storage and detention, the average rainwater storage rate was 56.08%, the average runoff production start time and average peak time were 103.94 min and 146.50 min respectively, which were positively correlated. In terms of water purification effect, the overall effect on the reduction of suspended solids(SS)and total phosphorus was obvious, the average reduction rates were 62.89% and 70.86% respectively, and the effect on the reduction of COD was obvious, with an average reduction rate of 48.03%, The effect of total nitrogen reduction was relatively weak, and the average reduction rate was 42.56%. Construct the classification method of biological cells. For the selected biological detention tank with weak storage and strong filtration, the selection of filter layer had the most significant influence, the particle size of filter layer took the second place, and the plant species and soil configuration had no significant influence. The best structural configuration was that the plant species was Pennisetum. The soil configuration was 40% cultivated soil, 30% peat soil and 30% sandy soil. The filler was 30cm thick quartz sand in the upper layer and 20cm thick zeolite in the lower layer. The particle size of the filter layer should be small.
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Received: 03 November 2021
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