Effect of Different Emitter Types on Anti-clogging Performance of Biogas Slurry Concentrations

doi:10.13304/j.nykjdb.2021.0408

Abstract

Abstract:

In order to study the effect of different emitter type on the clogging process of biogas slurry drip irrigation， and choose the most suitable emitter for biogas slurry drip irrigation fertilization， this paper selected 2 kinds of plate emitter， 2 kinds of cylinder emitter and 1 kind of plate-compensation emitter， and designed 2 kinds of biogas slurry ratio for periodic intermittent irrigation experiment， and compared the average relative flow rate and irrigation uniformity of different emitters. The experimental results showed as followed： the bigger the ratio of biogas slurry to water and fertilizer was， the easier the emitter clogging was； when the flow rate of emitter was the same， the anti-clogging performance of chip emitter was better than that of cylinder emitter and chip compensation emitter； when the emitter type was the same， the larger the rated flow rate was， the better the anti clogging performance was； the clogging process was more uniform and starts from the end of capillary； the type of blockage was physical and biological compound blockage. According to the test results， the optimal irrigation mode for biogas slurry fertilization was suggested as followed： the ratio of water and fertilizer was 1∶3， the irrigation pressure was 80 kPa， and the emitter was 3 L·h^-1； single stage 120 mesh filter was limited， so multi-stage filter could be added.

Key words: biogas slurry drip irrigation, type of irrigation emitter, clogging performance test, relative flow, irrigation uniformity

摘要：

为了研究不同类型灌水器滴头对不同水肥配比沼液的抗堵塞性能，获得适用于沼液滴灌施肥的滴头，选取2种片式滴头、2种圆柱滴头和1种片式补偿滴头共5种滴头，设计了2种沼液配比进行周期性间歇灌水试验，比较了不同滴头的抗堵塞能力。结果表明，沼液水肥配比越大，滴头越容易发生堵塞；滴头流量相同时，片式滴头抗堵塞性优于圆柱滴头和片式补偿滴头；滴头类型相同时，额定流量越大，抗堵塞性越好；堵塞进程较为均匀，堵塞发生从毛管尾端开始；堵塞类型以物理和生物结合的复合性堵塞为主。根据试验结果，建议沼液施肥时，最优灌溉模式为：水肥配比选择1∶3，灌水压力选择80 kPa，滴头选择3 L·h^-1的片式滴头；单级120目过滤器过滤效果有限，可以考虑增加多级过滤。

关键词: 沼液滴灌, 滴头类型, 堵塞性能试验, 平均相对流量, 灌水均匀度

CLC Number:

S275.6

Jie ZHENG, Hong CHEN, Lingjian MENG, Shanjun LI, Luchang MA. Effect of Different Emitter Types on Anti-clogging Performance of Biogas Slurry Concentrations[J]. Journal of Agricultural Science and Technology, 2022, 24(7): 108-116.

郑杰, 陈红, 孟令剑, 李善军, 马露畅. 不同类型灌水器滴头对沼液抗堵塞性能的影响[J]. 中国农业科技导报, 2022, 24(7): 108-116.

Figures/Tables 9

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参数Parameter	值Value
pH	8.2±0.1
总固体Total soilds/ %	0.50±0.02
挥发性固体Volatile solids/ %	0.030±0.002
化学需氧量Chemical oxygen demand/（mg∙L^-1）	2 896.5±120.5
浊度Turbidity/NTU	621.2±13.4
电导率Conductivity/（μs∙cm^-1）	2 875.7±13.2
Ca/（mg∙kg^-1）	489.075
Cu/（mg∙kg^-1）	24.675
Fe/（mg∙kg^-1）	5.200
K/（mg∙kg^-1）	1 852.675
Mg/（mg∙kg^-1）	1 8153.75
Mn/（mg∙kg^-1）	62.950

参数Parameter	值Value
pH	8.2±0.1
总固体Total soilds/ %	0.50±0.02
挥发性固体Volatile solids/ %	0.030±0.002
化学需氧量Chemical oxygen demand/（mg∙L^-1）	2 896.5±120.5
浊度Turbidity/NTU	621.2±13.4
电导率Conductivity/（μs∙cm^-1）	2 875.7±13.2
Ca/（mg∙kg^-1）	489.075
Cu/（mg∙kg^-1）	24.675
Fe/（mg∙kg^-1）	5.200
K/（mg∙kg^-1）	1 852.675
Mg/（mg∙kg^-1）	1 8153.75
Mn/（mg∙kg^-1）	62.950

滴头编号 Emitter number	滴头类型 Emitter type	额定流量 Rated flow/（L·h^-1）	额定压力 Rated pressure/kPa	长×宽×深 Length×width×depth/mm	制造偏差系数 Manufacture warp coefficient/%
E1	片式plate	2.0	160	54.2×1.12×0.82	2.3
E2	片式plate	3.0	180	36.8×1.18×0.93	2.8
E3	圆柱cylinder	2.0	180	162.63×1.12×0.83	4.2
E4	圆柱cylinder	3.0	180	187.83×1.33×1.15	4.1
E5	片式补偿plate-compensation	2.4	350	43.32×1.26×0.85	2.1

滴头编号 Emitter number	滴头类型 Emitter type	额定流量 Rated flow/（L·h^-1）	额定压力 Rated pressure/kPa	长×宽×深 Length×width×depth/mm	制造偏差系数 Manufacture warp coefficient/%
E1	片式plate	2.0	160	54.2×1.12×0.82	2.3
E2	片式plate	3.0	180	36.8×1.18×0.93	2.8
E3	圆柱cylinder	2.0	180	162.63×1.12×0.83	4.2
E4	圆柱cylinder	3.0	180	187.83×1.33×1.15	4.1
E5	片式补偿plate-compensation	2.4	350	43.32×1.26×0.85	2.1

滴头编号 Emitter number	沼液配比1∶1 Biogas ratio 1∶1		沼液配比1∶3 Biogas ratio 1∶3
滴头编号 Emitter number	拟合关系式 Fitting relation	R²	拟合关系式 Fitting relation	R²
E1	y=0.79x+21.78	0.972	y=0.73x+25.84	0.973
E2	y=0.61x+38.84	0.941	y=0.71x+25.11	0.982
E3	y=0.74x+24.29	0.983	y=0.88x+10.81	0.933
E4	y=0.68x+30.92	0.964	y=0.65x+32.68	0.981
E5	y=0.81x+20.58	0.912	y=0.89x+10.53	0.976