Plastic retrieval process and apparatus

Abstract

One or more nets can be suspended from beams extending from ships where they are towed through riparian waterways such as lakes and oceans to remove plastic waste from those waterways. In the instance of micro-bead removal, a pump can be utilized to move the waste from the end of the collection bag through a hose to the deck of the towing vessel. In the case of rivers, the net can be supported adjacent a riverbank using a plurality of posts. Fish excluders with exit flaps are employed to ensure no damage is done to wildlife within the riparian waterways.

Claims

1. Apparatus for removal of plastic waste from a riparian water system including oceans, rivers, streams and lakes, said apparatus comprising: a) at least one net having i) an open mouth with a lower edge 3-5 feet below a surface of the riparian water system and an upper edge 3-5 feet above the surface of the water system, ii) a body portion extending rearwardly from said mouth, said body portion including 1) a converging section, 2) at least one transition section, and 3) a tail end section; b) attachment means for securing said net to at least one boat such that said net is towed through the riparian water system by said at least one boat; c) a fish excluder in said transition section for permitting fish to swim out of said at least one net thereby not becoming entangled in said at least one net d) at least one reducer in said tail end section, said reducer producing cavitation which stirs plastic particles within said tail end section preventing bridging and clogging thereof upstream of said pump.

2. The apparatus for removing plastic waste of claim 1 further comprising a pump secured to the end of said tail end section, said pump having a hose attached thereto to pump plastic waste captured by said net through said hose back to a deck of the boat towing said net.

3. Apparatus for removal of plastic waste from a riparian water system including rivers, streams and lakes, said apparatus comprising: a) at least one net having i) an open mouth, ii) a body portion extending rearwardly from said mouth, including 1) a converging section, 2) a transition section, and 3) a tail end section; b) first post means for suspending said at least one net stationarily along a shore of the riparian water system so as not to impede boat traffic on the waterway; c) second post means for suspending said at least one net within the riparian water system, said at least one net stretched between said first and second post means with said mouth of said at least one net open in an upstream direction with a lower edge portion some 3-5 feet beneath a surface of said riparian water system and an upper edge portion above the surface of said riparian water system, said body portion extending rearwardly from said mouth.

4. The apparatus for removing plastic waste of claim 3 further comprising a fish excluder in said transition section for permitting fish to swim out of said at least one net thereby not becoming entangled in said at least one net.

5. A method for removal of plastic waste from navigable riparian water systems including rivers, streams and lakes, said apparatus comprising: a) securing at least one first closed-ended net with a mouth open in an upstream direction with a lower edge portion some 3-5 feet beneath a surface of said navigable riparian water system and an upper edge portion extending above the surface of said navigable riparian water system to a first set of poles on a first side of the navigable riparian water system; b) securing at least one second closed-ended net with a mouth open in an upstream direction with a lower edge portion some 3-5 feet beneath the surface of said riparian water system and an upper edge portion extending above the surface of said navigable riparian water system to a second set of poles on an opposing side of said navigable riparian water system, said at least one second net being longitudinally offset from said at least one first net within a riparian water system to avoid impeding navigation of said navigable riparian water system.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 depicts an exemplary collection net and mounting beam to suspend the net over the water to accomplish the method of the present invention;

(2) FIG. 2A is a second embodiment with a side-mounted net-supporting beam with a pump with a feed line for returning the accumulated plastic waste to the deck of the ship;

(3) FIG. 2B is an alternate version of the second embodiment in which the collection net is towed directly behind the collection vessel;

(4) FIG. 3A is yet another embodiment in which a single capturing net is towed between two ships;

(5) FIG. 3B depicts a single ship deploying two capturing nets, one from each side;

(6) FIG. 4 is a view of a net used in the plastic removal method of the present invention;

(7) FIG. 4A is a detail of the fish excluder positioned at the forward end of the transition section;

(8) FIG. 4B is a detail of one of the plurality of reducers mounted within the end of the net;

(9) FIG. 4C is a detail of the pump secured to the very end of the bag;

(10) FIG. 5A is a schematic side view of a net mounted along a riverbank; and,

(11) FIG. 5B is a top view of the net shown in FIG. 5A.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(12) A first embodiment of the plastic retrieval apparatus of the present invention is seen in FIG. 1 generally at 20. Apparatus 20 includes a ship 30 with a boom 40 extending laterally from first side 32. The boom extends outwardly from side 32 as much as 80 feet or more and cable 50 suspends a beam 52 which supports harness assembly 54 which holds the mouth of capture net 60 open. The top 62 of net 60 will be positioned 3-5 feet above the surface of the water with the bottom edge 64, similarly, being 3-5 feet below the surface. The mouth of the net is 8-10 feet tall and 30 feet wide. The net 60 will be pulled through the water at 1-8 knots to remove plastic and other waste from near the surface of a lake or ocean. When the net accumulates what is substantially a full load, it will be pulled onto the deck and replaced with a second empty net while the load in the full net is expelled.

(13) A second embodiment of the plastic retrieval apparatus of the present invention is depicted in FIGS. 2A-3B generally at 20′. In this embodiment, net 60′ is equipped with a converging section 70′, a transition section 80′, a tail end section 90′ with a pump 92′ feeding collected waste back to ship 30′ via a hose 94′. The suspension beam 52′ and harness employed with the first embodiment will typically be adapted for use with this embodiment, as well. This second embodiment is most beneficial when used to collect micro-plastic beads from the surface of the lake or ocean. However, it is also suitable for collection of plastic particles as large as a dinner plate. As shown in the various figures, the collection net 60′ may be suspended from a boom 40′ extending from the side 32′ of a ship 30′ (FIG. 2A), towed directly behind the ship 30′ (FIG. 2B), pulled between two cooperating ships 30A′ and 30B′ (FIG. 3A), or a pair of nets 60A′ and 60B′ can extend from sides 32A′ and 32B′, respectively, (FIG. 3B).

(14) Within transition section 80′ is a fish excluder 82′ with an exit flap to prevent fish from being caught in the net. In tail end section 90′ are a plurality of reducers 96′ which produce cavitation of the flow of the water/plastic waste stream causing stirring that eliminates the buildup or bridging of the micro-beads in the end section 90′ such that flow to the pump 92′ is continuous as is the feed through the hose 94′. This presumes a continuous intake at the mouth of the net 60′.

(15) A third embodiment of the present invention is depicted in FIGS. 5A and 5B generally at 20″. This embodiment is better suited for use in flowing riparian waterways such as rivers and streams. A plurality of posts 11″ will support the open-mouthed net 60″ along the shore of the waterway. The net 60″ has features similar to those of the other embodiments including a converging section 70″, a transition section 80″ including a fish excluder 82″, and a tail end or bag end section 90″. Depending on the width of the waterway, multiple nets 60″ can be mounted in juxtaposed position and/or on opposite banks, typically offset so as not to impede boat traffic on the waterway.