Highway sponge-type composite side ditch carbon neutralization system and method thereof

A highway sponge-type composite side ditch carbon neutralization system, comprising three units, wherein the three units are a silt pre-sedimentation channel, a filtering and oil-absorbing channel, and an ecologic purification channel, wherein,

• the silt pre-sedimentation channel, the filtering and oil-absorbing channel, and the ecologic purification channel are connected horizontally and successively;
• road runoff enters the silt pre-sedimentation channel from an inlet ditch, flows into the filtering and oil-absorbing channel from the silt pre-sedimentation channel, consecutively flows into the ecological purification channel and flows out from an outlet ditch after being treated, wherein the silt pre-sedimentation channel comprises:
• a first water inlet and a first water outlet arranged at middle-upper parts of a first water inlet side and a first water outlet side of the silt pre-sedimentation channel respectively;
• a sand collecting bucket arranged at a first bottom portion towards the first water inlet side;
• and
• a sludge converging slope inclined at an angle from the first water outlet side towards the first water inlet side, wherein the sludge converging slope is arranged at a bottom plate of the silt pre-sedimentation channel;
• effluent water from the silt pre-sedimentation channel is received by the filtering and oil-absorbing channel through the first water outlet at a middle-upper part of a second water inlet side of the filtering and oil-absorbing channel wherein, the filtering and oil-absorbing channel further comprises:
• a second water outlet arranged at a bottom portion of a second water outlet side of the filtering and oil-absorbing channel;
• a second filtering layer comprising second filter materials;
• a first filtering layer comprising first filter materials;
• and
• an oil-absorbing fiber layer;
• and
• grating plates, wherein,
• the second filtering layer, the first filtering layer and the oil-absorbing fibre layer are arranged in the filtering and oil-absorbing channel from bottom to top;
• and
• the grating plates are arranged at a top of the second filtering layer and at a top of the first filtering layer, wherein the grating plates are configured to prevent filter materials from floating up and floating away;
• effluent water from the filtering and oil-absorbing channel is received by the ecologic purification channel through the second water outlet into a third water inlet at a bottom portion of a third water inlet side of the ecological purification channel, wherein the ecologic purification channel comprises:
• a modified volcanic rock layer;
• a sawdust layer;
• a modified ceramsite layer comprising modified ceramsites, wherein the modified ceramsite is formed by combined processing of zeolite, fly ash and calcium carbonate;
• a configured planting soil layer;
• carbon sink vegetation;
• and
• a third water outlet,
• wherein,
• the modified volcanic rock layer, the sawdust layer and the modified ceramsite layer are arranged successively in the ecologic purification channel from bottom to top;
• the sawdust layer is filled with sawdust, wherein each of the sawdust particle has a particle size of 30 mm and the sawdust layer is doped with microbial quick-dissolving balls at a volume ratio of 10%;
• the modified ceramsite layer is filled with modified ceramsites, wherein each of modified ceramsite has a particle size of 20 mm and the ceramsite layer is doped with microbial quick-dissolving balls at a volume ratio of 20%, wherein, each of the microbial quick-dissolving balls in the saw dust layer and the modified ceramsite layer are configured to be:
• internally filled with functional microorganisms for deep nitrogen and phosphorus removal;
• and
• externally packed with PVA that gradually dissolves in water to uniformly disperse the functional microorganisms filled within;
• and
• the third water outlet is arranged over the configured planting soil layer of the ecologic purification channel at a third water outlet side.